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The Doctor is the central character in the long-running BBC television science-fiction series Doctor Who, and also features in a vast range of spin-off novels, audio dramas and comic strips connected to the series.

To date, ten actors have officially played the role in the television series (including the 1996 television film), with these changes being explained by the ability of the character's race to regenerate. Several other actors have played the character on stage and film, in audio dramas, and in occasional special episodes of the series. The character's enduring popularity led the Daily Telegraph to dub him "Britain's favourite alien". The Doctor, in his tenth incarnation, is currently played by David Tennant, who announced in late 2008 that he would leave the role in 2010. Matt Smith is scheduled to assume the role of the Eleventh Doctor in 2010.


The Doctor is a Time Lord, an extraterrestrial from the planet Gallifrey, who travels time and space in an internally vast time machine called the TARDIS.The Doctor explores the universe at random, using his extensive knowledge of science, technology and history (from his perspective) to avert whatever crises he encounters. The imprecise nature of his travels is initially attributed to the age and unreliability of the TARDIS's navigation system. The serial The War Games however, reveals that the Doctor actually stole the TARDIS. He was presumably unfamiliar with its systems and therefore was unable to operate it correctly. After his trial and exile to late twentieth century Earth, the Doctor still visits other planets on missions from the Time Lords who pilot the TARDIS to precise location for him. After his exile is lifted the Doctor returns to his travels and demonstrates the ability to reach a destination of his own choosing more often than not. In "Journey's End", the Doctor states that the reason for the previous bumpy navigation was that the TARDIS is meant to have six pilots. The Doctor generally travels with one or more companions. Most of these make a conscious decision to travel with him, but others, especially early in the series, are accidental passengers.

The Doctor's childhood

Little is known about the Doctor's childhood. The classic series often references his time at the academy and that he belongs to the Prydonian chapter of Time Lords, who are notoriously devious. His teachers included Borusa who would eventually become President of the High Council and other pupils included The Master and possibly the Rani. The Eighth Doctor, in the 1996 television movie is the first to mention his parents or childhood before this, when he tells Grace Holloway that he remembers watching a meteorite shower from a grassy hill top in the company of his father.

During "The Girl in the Fireplace", Madame de Pompadour "saw" memories of his childhood during a telepathic session between the two and commented that it was "so lonely". However, when asked if he has a brother in "Smith and Jones", the Doctor simply replied "not any more." In the same episode, he mentioned "playing with Röntgen blocks in the nursery." He was also once good friends with the Master.

In "The Time Monster", the Doctor says he grew up in a house on the side of a mountain, and talks about a hermit who lived under a tree behind the house and inspired the Doctor when he was depressed. In the BBC novel The Nightmare of Black Island the Doctor stated his favourite childhood story was Moxx In Socks. The Doctor, then played by Jon Pertwee (Planet of the Spiders) met up with one of his teachers who was possibly the hermit mentioned.

In "The Sound of Drums" (2007), the Doctor describes a Time Lord Academy initiation ceremony where, at the age of eight, Time Lord children are made to look into the Untempered Schism, a gap in space and time where they could view the time vortex. Some are inspired, some go mad (as he suggests happened to his nemesis, the Master), and some run away. When asked which he was, he replies, "Oh, the ones that ran away – I never stopped!"

The most complete glimpses into the Doctor's childhood occurs in the Virgin New Adventures novel Lungbarrow; however, as with all non-televised Doctor Who media, the canonicity of this story is unclear. Lungbarrow portrays the Doctor as being one of 45 cousins grown from the House genetic loom as an adult (in New Adventures continuity the Time Lords are not capable of sexual reproduction and survive through genetic looms producing a quota of cousins). The Head of the Family Ordinal General Quinces knew that the Doctor had a special destiny and built him a robot tutor called Badger and planned the Doctor's eventual rise to the post of President. His fellow cousins resented the Doctor's position and he spent most of his childhood being bullied by his cousin Glospin and was equally brutally treated by the Housekeeper Satthralope. Eventually he rebelled against Quinces' grand plans and was exiled from the family, eventually stealing a TARDIS and leaving Gallifrey. This is seemingly contradicted by The Sound of Drums, showing the Master as a child, but it is possible that the Doctor was simplifying things and Lungbarrow deliberately leaves room for different interpretations of the Doctor's origins as do latter books. The BBC books novel The Infinity Doctors, for example states that the Doctor was born from the loom but was also the son of a Gallifreyian explorer and a human mother. Perhaps the best explanation for the contradictory tales of the Doctor's origins is given in the novel Unnatural history, which implies that all versions of the Doctor's origins are somehow true.


References to the Doctor's family are rare in the series. During the first two seasons he travelled with his granddaughter, Susan Foreman, and as noted above he apparently once had a brother. Although fans have raised the possibility that Susan may not be the Doctor's granddaughter, it is never hinted in the stories she features (or was it ever the intentions of the production team) that this is the case.

During his second incarnation when asked about his family, the Doctor says his memories of them are still alive when he wants them to be and otherwise they sleep in his mind (The Tomb of the Cybermen). In The Time Monster, the third Doctor states that as a little boy he lived in a house perched halfway up a mountain. In The Curse of Fenric, when asked if he has any family, the Seventh Doctor replies that he doesn't know, indirectly hinting that an unspecified fate may have befallen them.

In "Fear Her" the Tenth Doctor mentions to Rose that he "was a dad once", but then quickly changes the subject; he makes the same admission to Donna in "The Doctor's Daughter" when she inaccurately assumes that he has "Dad-shock". He later clarifies in the same episode that he had been a father, but that that was lost to him during the Time War. In "The Empty Child", when Dr. Constantine says to him "before this war began, I was a father and a grandfather. Now I'm neither. But I'm still a doctor," he simply replies, "Yeah. I know the feeling."

He mentions his father in the 1996 Doctor Who telefilm, where he also indicates his mother was human (see "Continuity curiosities" below). In "The Doctor's Daughter", the Doctor had his genetic information stolen and used to create a female soldier and comes to refer to the result, a young woman named Jenny (played by Georgia Moffett, real world daughter of Peter Davison), as his daughter (she in turn knows him as her father). In the episode "Blink", the Doctor claims that he never was good at weddings, especially his own. By the end of the episode "Journey's End" a half-human Doctor is created from his severed hand, when the Tenth Doctor transfers his regeneration energy into the hand to prevent a full regeneration of his own body. Both Doctors share the same memories up until that point but the half-human Doctor also has elements of Donna Noble's personality and her DNA as a result of her touching the hand, causing the mass regeneration to occur.

In the beginning

The character of the Doctor was created by the BBC's Head of Drama Sydney Newman. The first format document for the series that was to become Doctor Who — then provisionally titled The Troubleshooters — was written up in March 1963 by C. E. Webber, a BBC staff writer who had been brought in to help develop the project. Webber's document contained a main character described as "The maturer man, 35–40, with some 'character twist'." However, Newman was not keen on this idea and — along with several other changes to Webber's initial format — created an alternative lead character named "Dr Who": a crotchety older man piloting a stolen time machine, on the run from his own far future world. No written record of Newman's conveyance of these ideas — believed to have taken place in April 1963 — exists, and the character of "Dr Who" first begins appearing in existing documentation from May of that year.

The character was first portrayed by William Hartnell in 1963. When, after three years, Hartnell left the series due to ill health, the role was handed over to respected character actor Patrick Troughton. To date, official television productions have depicted ten distinct incarnations of the Doctor (due to Hartnell's death in 1975, actor Richard Hurndall substituted in his role as the First Doctor in 1983's The Five Doctors, resulting in a technical total of eleven actors). Of those, the longest-lasting incarnation is the Fourth Doctor, as played by Tom Baker. Currently, the Tenth Doctor is portrayed by David Tennant.

At the series' beginning, nothing at all is known of the Doctor: not even his name, the actual form of which remains a mystery. In the very first serial, An Unearthly Child, two teachers from Coal Hill School in Londonmarker, Barbara Wright and Ian Chesterton, become intrigued by one of their students, Susan Foreman, who exhibits high intelligence and unusually advanced knowledge. Trailing her to a junkyard at 76 Totter's Lane, they encounter a strange old man and hear Susan's voice coming from inside what appears to be a police box. Pushing their way inside, the two find that the exterior is actually camouflage for the dimensionally transcendental interior of the TARDIS. The old man, whom Susan calls "Grandfather", subsequently kidnaps Barbara and Ian to prevent them from telling anyone about the existence of the ship, taking them on an adventure in time and space.

Becoming "involved"

The Doctor is an adventurer and scientist with a strong moral sense. He usually solves problems with his wits rather than with force, and is more likely to wield a sonic screwdriver than a gun; although he has been seen to use weapons as a last resort. According to the alien villain Chedaki in the episode The Android Invasion, "his long association with libertarian causes" shows that "his entire history is one of opposition to conquest."

As a time traveller, the Doctor has been present at or directly involved in countless major historical events on the planet Earth and elsewhere — sometimes more than once. In the 2005 series premiere, "Rose", it is revealed that the Ninth Doctor was instrumental in preventing a family from boarding the Titanicmarker prior to her fateful voyage. In "The End of the World", the Doctor claimed to have been on board and survived the Titanic's sinking to find himself 'clinging to an iceberg.' The Fourth Doctor also mentioned this event in Robot and The Invasion of Time, where he claims the sinking was not his fault.

Many historical figures on Earth have also encountered the Doctor. In City of Death it is revealed that the Doctor has met Leonardo da Vinci and William Shakespeare (whom he re-met in "The Shakespeare Code"), and that the first folio of the latter's Hamlet was transcribed by the Doctor himself (City of Death). He has also met a young H. G. Wells (Timelash), Albert Einstein (Time and the Rani), Mao Tse Tung (The Mind of Evil), Richard the Lionheart (The Crusade), Wyatt Earp (The Gunfighters), and Marco Polo (Marco Polo). More recently, the Doctor has shared adventures with Charles Dickens ("The Unquiet Dead"), Agatha Christie ("The Unicorn and the Wasp"), Queen Victoria ("Tooth and Claw"), Elizabeth I ("The Shakespeare Code") and Madame de Pompadour ("The Girl in the Fireplace"). A photograph seen in the 2005 series shows that the Ninth Doctor witnessed the deathmarker of USmarker president John F. Kennedy. In the episode "Gridlock" after handing his coat to Brannigan and his wife, he asks them to take care of it saying "Janis Joplin gave me that coat."

It is this penchant for becoming "involved" with the universe — in direct violation of official Time Lord policy — that has caused the Doctor to be labelled a renegade by the Time Lords. Most of the time, however, his actions are tolerated, especially given that he has saved not just Gallifrey but also the universe several times over. The Time Lords are also partial to sending him on missions when deniability or expendability is needed. The Doctor's standing in Time Lord society has waxed and waned over the years, from being a hunted man to being appointed Lord President of the High Council. He does not assume the office for very long, and is eventually removed from it in his absence.


Although Time Lords resemble humans, their physiology differs in some key respects. For example, like other members of his race, the Doctor has two hearts (binary vascular system), a "respiratory bypass system" that allows him to go without air, an internal body temperature of 15–16 degrees Celsius (60 degrees Fahrenheit) and he occasionally exhibits a super-human level of stamina, and the ability to absorb, withstand, and expel large amounts of certain types of radiation (the Tenth Doctor claimed they used to play with Röntgen bricks in the nursery, after absorbing the radiation from an x-ray of significantly magnified power). Certain stories also imply that he is somewhat resistant to cold temperatures, but other stories show him wearing warm weather clothing. To counter extreme trauma, such as exposure to the poisonous fungus in The Seeds of Death and after being shot in Spearhead From Space, he can go into a self induced coma until he recovers. Spin-off fiction has implied that he can do this because Time Lords have a small nerve cluster in their left shoulders that control motor functions, but this has yet to be confirmed in the series. Additionally, he has shown a resistance to temporal effects and has demonstrated a telepathic ability, similar to the Vulcan mind meld portrayed in Star Trek, albeit to a limited degree. In "The Fires of Pompeii" the Doctor reveals that he is able to perceive the fabric of time, discerning "fixed points" and "points in flux", as well as all past, present and possible future events. The Doctor also exhibits some weaknesses uncommon to humans. For example, in The Mind of Evil (1971) he claimed that a tablet of aspirin could kill him.

In his final serial, the Second Doctor states that Time Lords can live forever, "barring accidents." When "accidents" do occur, Time Lords can usually regenerate into a new body. However, it is stated in The Deadly Assassin that Time Lords can only regenerate a total of twelve times, giving a theoretical final total of thirteen incarnations. Regeneration is apparently optional, as in "Last of the Time Lords" the Master refuses to regenerate despite the Tenth Doctor's pleading. In The Five Doctors the Time Lords offer the Master a second regeneration cycle, and at some point did give him one during the events of the Time War, but how this is possible has not been revealed.

Doctor who?

In the first episode, Barbara addresses the Doctor as "Doctor Foreman", as this is the surname the Doctor's granddaughter Susan goes by, and the junkyard in which they find him bears the sign "I.M. Foreman". When addressed by Ian with this name in the next episode, the Doctor responds, "Eh? Doctor who? What's he talking about?" Later, when he realises that "Foreman" is not the Doctor's name, Ian asks Barbara, "Who is he? Doctor who?" (In an ultimately-unused idea from documents written at the series' inception, Barbara and Ian would have subsequently referred to the Doctor as 'Dr. Who', given their not knowing his real given name.)

Similarly, in the 2005 series premiere "Rose", when asked his name, the Doctor replies, "Just 'The Doctor'." New companion Rose Tyler later finds a website devoted to the Doctor on the Internet, run by a conspiracy theorist who has been tracking the Ninth Doctor's appearances throughout history, carrying the title "DOCTOR WHO?" (see Doctor Who tie-in websites). The BBC launched a "real" version of this website with the idea that it is run by Mickey Smith, Rose's boyfriend (who has taken over the site following the death of its originator).

Although listed in the on-screen credits for nearly twenty years as "Doctor Who" or "Dr Who", the Doctor is never really called by that name in the series, except in a tongue-in-cheek manner; for example, in The Five Doctors when one character refers to him as "the Doctor", another character asks, "Who?" The only real exception is the computer WOTAN in the serial The War Machines, which commands that "Doctor Who is required." The Third Doctor's car, dubbed "Bessie", carried the licence plate WHO 1, the only ongoing reference to the "Doctor Who" enigma in the original series. The Third Doctor also later drove an outlandish vehicle called the "Whomobile" in publicity materials, but it is never referred to as such in the series, being simply known as "the Doctor's car" or "my car", as the Doctor puts it. The name "Doctor Who" is also used in the title of the serial Doctor Who and the Silurians, but this was a captioning error rather than an in-story mention. The only other time this occurs is in the title of Episode 5 of The Chase: "The Death of Doctor Who".

In the Third Doctor serial The Dæmons the Doctor is briefly given the alias of the Great Wizard Qui Quae Quod. This is actually the masculine, feminine and neuter forms of the relative pronoun "who" in the Latin language.

In the Fourth Doctor serial "The Armageddon Factor", the Doctor runs into a former class mate of his named Drax. Drax, refers to the Doctor several times as "Thete", to which the Doctor replies "It's the Doctor." "Thete" is then revealed to be short for Theta Sigma, the Doctor's nickname at Prydon Academy on Gallifrey, as also referenced in "The Happiness Patrol".

In "The Christmas Invasion", the newly regenerated Doctor stumbles out of the TARDIS in a confused state in front of Jackie Tyler and Mickey. When Rose emerges from the TARDIS, she tells them that he is the Doctor, to which a confused Jackie replies "What do you mean that's the Doctor? Doctor Who?". A similar version of this in-joke is told in the serials The Curse of Peladon, The Five Doctors and the audio commentary for Revelation of the Daleks reveals that Colin Baker tried to slip it into that serial when the Daleks fail to recognise him. In "The Girl in the Fireplace" (2006), Madame de Pompadour reads the Doctor's mind and remarks about his name, "Doctor who? It's more than just a secret, isn't it?" In the podcast commentary on the BBC website, writer Steven Moffat suggests that, as the Doctor does not tell even his closest companions his name, there must be a "dreadful secret" about it. Within the same commentary, Moffat and actor Noel Clarke jokingly suggest his name to be "Curtis". Ironically, according to the in-vision commentary on the DVD release, David Tennant had to inform actress Sophia Myles (who played Madame de Pompadour) that she was not, in fact, revealing the Doctor's surname as she believed was the intent of the dialogue. In "The Shakespeare Code", the Carrionite Lilith, unable to discover his true name, remarks, "Why would a man hide his title in such despair?" A psychically-inspired human in "The Fires of Pompeii" remarks that his name "Doctor" is false and that his true name is in fact hidden. In Moffat's "Forest of the Dead", the character River Song reveals she knows the Doctor in his future, and it is implied that they shared a very intimate relationship. In order to gain his trust, she whispers something — inaudible to the audience — into his ear, which he later reveals was his real name. The Doctor states that there is "only one reason" he would reveal his name and that there is "only one time [he] could".

The dialogue joke was also used in 1981's unsuccessful pilot for K-9 and Company, wherein the Fourth Doctor's robotic dog, K-9, is discovered by his former companion, Sarah Jane Smith, and describes itself as being a gift to her from "The Doctor". Supporting character Brendan Richards asks, "Who's the doctor?" to which K-9 replies its catch-phrase, "Affirmative." The show's events were incorporated into canon in The Five Doctors and the 2006 Doctor Who episode, "School Reunion".

Doctor Who spin-off media, which are of uncertain canonicity, have suggested that the character uses the name "the Doctor" because his actual name is impossible for humans to pronounce. This is also repeated by companion Peri Brown in the radio serial Slipback. This is unlikely to be true, since River Song whispers it to him in "Forest of the Dead." The Faction Paradox encyclopedia The Book of the War, which is of dubious canonicity, states that all renegades from the Homeworld/Gallifrey abandon their names to symbolise how they leave their culture. Similarly, the novel Lungbarrow reveals that the Doctor's name has been struck from the records of his family and therefore cannot be spoken.

The character played by Peter Cushing in the films Dr. Who and the Daleks and Daleks - Invasion Earth 2150 AD referred to himself as "Dr. Who". However, these films are not considered part of the canon as they were based upon two television serials featuring William Hartnell and made considerable alterations to the characters of the Doctor and his companions.

Alias "The Doctor"

Quite apart from his name, why the Doctor uses the title of "The Doctor" has never been fully explained on screen. The Doctor, at first, said that he was not a physician, often referring to himself as a scientist or an engineer. However he does occasionally show medical knowledge and has stated that he studied under Joseph Lister and Joseph Bell on separate occasions. In The Moonbase, the Second Doctor mentions that he studied for a medical degree in Glasgowmarker during the 19th Century. He has also been mocked by his fellow Time Lords for adhering to such a "lowly" title as "Doctor", although in The Armageddon Factor he tells Drax that he achieved his doctorate, indicating it was at least a somewhat respectable title. In "The Girl in the Fireplace", he draws an analogy between the title and Madame de Pompadour's. In "The Sound Of Drums", the Master remarks to the Doctor that they both chose their names, and that it was sanctimonious of the Doctor to identify himself as "the man who makes people better", as well as the fact that one of the Master's assistants calls him a doctor of "everything". The Fourth Doctor states that his companion, Harry Sullivan, is a Doctor of medicine, while he is "a doctor of many things" (Revenge of the Cybermen), but on another occasion states that his doctorate is only honorary. In talking with Harry in Robot, the Doctor states "You may be a doctor, but I'm the Doctor. The definite article you might say."

The Telos novella Frayed by Tara Samms (which takes place prior to "An Unearthly Child") has the First Doctor being given that title by the staff of a besieged human medical facility on the planet Iwa, suggesting at the end that the Doctor liked the official title so much that he adopted it. However, this does not quite explain why the Time Lords use the same title in addressing him. The same story also has Jill, a young girl living in the facility, naming the Doctor's granddaughter "Susan" after Jill's mother. The canonicity of all non-television sources is uncertain.

To make up for his lack of a practical name, the Doctor often relies upon convenient pseudonyms. In The Gunfighters, the First Doctor uses the alias Dr. Caligari. In The Highlanders the Second Doctor assumes the name of "Doctor von Wer" (a German approximation of "Doctor Who"), and signs himself as "Dr. W" in The Underwater Menace. The Eighth Doctor's companion Grace briefly refers to him by the alias "Dr Bowman" in the 1996 Doctor Who television movie.

In The Wheel in Space, his companion Jamie McCrimmon, reading the name off some medical equipment, tells the crew of the Wheel that the Doctor's name is "John Smith". The Doctor subsequently adopts this alias several times over the course of the series, often prefixing the title "Doctor" to it. This name is particularly prominent during his third incarnation when, as scientific advisor to UNIT, he gives it to Brigadier Lethbridge-Stewart to be put on his official credentials. The Tenth Doctor is conveniently using the name when he unsuspectingly meets Sarah Jane Smith whom he had not seen for twenty-three years and several incarnations. Suspicious but in public, she mentions that she used to know a man who sometimes used that name. In response to his explanation, "It's a very common name," she remarks, "He's a very un-common man."

In the audio adventure The Sirens of Time when the 5th Doctor is asked his name, he states: "I'm the Doctor." To which, he's answered: "Doctor? That's a profession, not a name." The Doctor is then quoted as saying: "It's all I have."

In "New Earth", it is implied that the Doctor is part of the prophecy of the Face of Boe and is referred to as "The Lonely God". In "Tooth and Claw", having landed in Scotland, the Tenth Doctor introduces himself as "Dr James McCrimmon" from the township of Balamory, in reference to the Second Doctor's companion Jamie. Later in that episode, the Doctor is knighted by Queen Victoria as "Sir Doctor of TARDIS"; she then declared him an enemy of the crown and banished him for all time, with Torchwood in part created to enforce this banishment.

To his greatest enemies, the Daleks, the Doctor is known as the Ka Faraq Gatri, the "Bringer of Darkness", "Destroyer of Worlds" or "The Oncoming Storm". This is first mentioned in the novelisation of Remembrance of the Daleks by Ben Aaronovitch and subsequently taken up in the spin-off media, particularly the Virgin New Adventures books and the Doctor Who Magazine comic strip. In "The Parting of the Ways", the Doctor claims that the Daleks call him "The Oncoming Storm" — this name is used by the Draconians (whose word for it is "Karshtakavaar") to refer to the Doctor in the Virgin New Adventures novel Love and War by Paul Cornell.

The series has also occasionally toyed with the Doctor's identity (or lack thereof). In the first part of The Mysterious Planet, the Doctor suggests writing a thesis on "Ancient Life on Ravolox, by Doctor...", but is interrupted by Peri. In The Armageddon Factor, the Time Lord Drax addresses the Fourth Doctor as "Thete", short for "Theta Sigma". Later, in The Happiness Patrol, this was clarified as a nickname from the Doctor's University days; he is called by this name again in the Paul Cornell novel Goth Opera. In Remembrance of the Daleks the Seventh Doctor produces a calling card with a series of pseudo-Greek letters inscribed on it (as well as a stylised question mark). This may be a reference to Terrance Dicks' and Malcolm Hulke's book The Making of Doctor Who (1972), which claims that the Doctor's true name is a string of Greek letters and mathematical symbols.

The question mark motif was common throughout the eighties, in part as a branding attempt. Beginning with season eighteen, the Fourth through Seventh Doctors all sported costumes with a red question mark motif (usually on the shirt collars, except for the Seventh Doctor — it appeared on his pullover and in the shape of his umbrella handle). In the 1978 serial The Invasion of Time, the Fourth Doctor is asked to sign a document; although the signature itself is not directly seen on screen, his hand movements clearly indicate that he signs it with a question mark. A similar scene occurs with the Seventh Doctor in Remembrance of the Daleks.

It was mentioned by Tom Baker, the Fourth Doctor, during an interview with The Age in 2003, that the Doctor is called so because he is "a doctor of time and relative dimension in space". Apart from being called a doctor of the TARDIS, the Doctor has also been referred to as just a "doctor of time travel".

On-screen credits

In the early years of the spin-off comic strips, books, films and other media, the character was initially called "Doctor Who" (or just "Dr Who") in the stories as a matter of course. This usage declined as the years went by.

Perhaps complicating the matter is that, from the first television serial through to Logopolis (the last story of Season 18 and also of the Tom Baker era), the lead character was credited as "Doctor Who" (or sometimes "Dr Who"). Starting from Peter Davison's first story, Castrovalva (the first story of the series' Season 19) to the end of Season 26, he is credited simply as "The Doctor".

This format is continued in the 1996 television movie for Paul McGann's credit, while Sylvester McCoy's incarnation is credited as "The Old Doctor". For the 2005 revival starring Christopher Eccleston, the credit reverted to "Doctor Who". However, in "The Christmas Invasion", and subsequent stories featuring David Tennant, the character is once again identified in the closing credits as "The Doctor", with "The Parting of the Ways" being the only episode to feature David Tennant in which he is credited as playing "Doctor Who". According to Doctor Who Magazine #367 this reversion was specifically requested by Tennant.

Changing faces

The changing of actors playing the part of the Doctor is explained within the series by the Time Lords' ability to regenerate after suffering illness, mortal injury or old age. The process repairs and rejuvenates all damage, but as a side-effect it changes his physical appearance and personality. This ability was not introduced until producers had to find a way to replace the ailing William Hartnell with Patrick Troughton and was not explicitly called "regeneration" until Jon Pertwee's transformation to Tom Baker at the climax of Planet of the Spiders (1974). On screen, the transformation from Hartnell to Troughton was called a "renewal" and from Troughton to Pertwee a "change of appearance".

The original concept of regeneration or renewal was that the Doctor's body would rebuild itself in a younger, healthier form. The Second Doctor was intended to be a literally younger version of the First; biological time would turn back, and several hundred years would get taken off the Doctor's age, rejuvenating him. In practice, however, after the Doctor stated his age in the Second Doctor serial The Tomb of the Cybermen (1967), the Doctor's age has been recorded progressively, however many regenerations the Doctor goes through (but see below). Coincidentally, the general trend has been toward increasingly younger actors for the role. However, this pattern has been broken with the transition from the Fifth to the Sixth Doctor, the transition from the Sixth to the Seventh Doctor, and the unseen transition from the Eighth to the Ninth Doctor with apparently older actors taking on the role from younger actors. The pattern was reused with the transition of the Ninth to the Tenth and the Tenth to the Eleventh Doctor, although current showrunner Steven Moffat is on record stating the intention was to cast an actor in his mid 30s to 40s for the role of the Eleventh Doctor.

The actors who have played, or who will play in the case of Matt Smith, the Doctor in the series, and the dates of their first and last regular television appearances in the role, are:

  1. First Doctor - William Hartnell: 23 November 1963 – 29 October 1966, Richard Hurndall: 25 November 1983
  2. Second Doctor - Patrick Troughton: 29 October 1966 – 21 June 1969
  3. Third Doctor - Jon Pertwee: 3 January 1970 – 8 June 1974
  4. Fourth Doctor - Tom Baker: 8 June 1974 – 21 March 1981
  5. Fifth Doctor - Peter Davison: 21 March 1981 – 16 March 1984
  6. Sixth Doctor - Colin Baker: 16 March 1984 – 6 December 1986
  7. Seventh Doctor - Sylvester McCoy: 7 September 1987 – 6 December 1989 in the series, and 27 May 1996 in the Doctor Who film
  8. Eighth Doctor - Paul McGann: 27 May 1996, in the Doctor Who film, and in the BBC Radio 7 Doctor Who series.
  9. Ninth Doctor - Christopher Eccleston: 26 March 2005 – 18 June 2005
  10. Tenth Doctor - David Tennant: 18 June 2005 – 2010
  11. Eleventh Doctor - Matt Smith: 2010 –

Actors who have played the Doctor in the Dr. Who cinema films:
  1. Dr. Who and the Daleks and Daleks - Invasion Earth 2150 AD- Peter Cushing: 1965/1966

Actors who have played the Doctor in webcast form where the canon status is unclear:
  1. Scream of the Shalka - Richard E. Grant: 2003


Throughout his regenerations, the Doctor's personality has retained a number of consistent traits. Its most notable aspect is an unpredictable, affable, clownish exterior concealing a well of great age, wisdom, seriousness and even darkness. While the Doctor can appear childlike and jocular, when the stakes rise, as, for example, in Pyramids of Mars, he will often become cold, driven and even callous. Another aspect of the Doctor's persona, which, though always present, has been emphasised or downplayed from incarnation to incarnation, is compassion. The Doctor is a fervent pacifist and is dedicated to the preservation of sentient life, human or otherwise, over violence and war, even going so far as to doubt the morality of destroying his worst enemies, the Daleks, when he has the chance to do so in Genesis of the Daleks, and again in Evolution of the Daleks. He also, in The Time Monster, begs Kronos to spare the Master torment or death, unintentionally winning the evil Time Lord's freedom, which he tells Jo Grant was preferable anyway, and forgives the Master for his actions in The Sound of Drums and Last of the Time Lords, vowing to take responsibility for his former friend.

Nonetheless, the Doctor will kill when given no other option and occasionally in self-defence; examples of this can be seen in The Tomb of the Cybermen, The Dominators, The Invasion, The Krotons, Spearhead from Space, The Sea Devils, The Three Doctors, The Brain of Morbius, The Talons of Weng-Chiang, The Invasion of Time, Earthshock, The Two Doctors, Silver Nemesis, World War Three, The Christmas Invasion, Tooth and Claw, The Age of Steel, The Runaway Bride, Smith and Jones and most notably in Remembrance of the Daleks when he arranges for the planet Skaro to be destroyed; it is also suggested he may have been responsible for destroying both the Dalek and Time Lord races in order to end the Time War mentioned numerous times in the series beginning in 2005. Another example of the Doctor purposely taking a life is The Sontaran Experiment, where he tells his companion Harry Sullivan to remove a device from the Sontaran ship, an act which results in the death of the Sontaran, something which The Doctor knew would happen, but Harry had no idea would. In the 2005 episode The End of the World, the Doctor teleports Cassandra back onto the ship and does nothing to prevent her death, even ignoring her cries for help and pity. In situations where fixed points in history must be preserved, the Doctor is sometimes faced with hard choices resulting in the deaths of many; In The Visitation he started the Great Fire of London, and in The Fires of Pompeii he caused the volcano above Pompeii to erupt, which killed everyone in the city (but saved the rest of the world). On other occasions he is seen to be critical of others who use deadly force, such as his companions Leela in The Face of Evil and Talons of Weng-Chiang, or Jack Harkness in "Utopia".

The Doctor has an extreme dislike for weapons such as firearms (including rayguns) and will often decline to use them even when they are convenient. He has proven capable of using them effectively when necessary, as seen in Resurrection of the Daleks and Revelation of the Daleks. He will occasionally use a firearm as a convenient way to bluff his way through a situation, hoping that his foe will not suspect that he does not intend to shoot.

The Doctor has a deep sense of right and wrong, and a conviction that it is right to intervene when injustice occurs, which sets him apart from his own people, the Time Lords, and their strict ethic of non-intervention.

Although throughout his regenerations the Doctor remains essentially the same person, each actor has purposely imbued his incarnation of the role with distinct quirks and characteristics and the production teams purposefully dictate new personality traits for each actor to portray.


Different actors have used different regional accents in the role. The first six Doctors spoke in Received Pronunciation or "BBC English", as was standard on British television at the time. Sylvester McCoy used a very mild version of his own Scottish accent in the role, and Paul McGann spoke with a faint Liverpudlian lilt. Only rarely, as in the case of the Eighth Doctor, who was identified by Americanmarker characters as "British", or the Ninth, whose accent was clearly described as "Northern", was this even addressed in the series (in the latter case with the line, "lots of planets have a North").

Another example is in The Tomb of the Cybermen when the Doctor is identified as "English" and, dissembling, plays along. Though David Tennant speaks with a natural Scottish accent, he plays the Doctor with an Estuary accent (apart from when, in the Highlands-set episode "Tooth and Claw", the character is pretending to be a local). According to producer Russell T Davies, this was intended as a consequence of spending so much time with Rose. "The Christmas Invasion" would have alluded to this, but the line was cut. Davies also said that after Eccleston's accent, he did not want Tennant "touring the regions" with a Scottish one (although Tennant originally stated that he hoped to become the first Doctor to wear a kilt), and so asked Tennant to affect the same accent he used for the earlier BBC period drama Casanova.

When asked if he is English/British, the Doctor has been known to reply: "No, but thank you for the compliment." In the Big Finish audio adventure The Sirens of Time the captain aboard a German U-boat assumes he is English because of the way he pronounces his words.

Changing fashions

The Doctor's clothing has been equally distinctive, from the distinguished Edwardian suits of the First Doctor to the Second Doctor's rumpled, Chaplinesque attire to the frills and velvet of the Third Doctor's era. The Fourth Doctor's long frock coat, loose fitting trousers, occasionally worn wide-brimmed hat and trailing, multistriped scarf added to his somewhat shambolic and bohemian image; the Fifth's Edwardian cricketer's outfit suited his youthful, aristocratic air as well as his love of the sport (with a stick of celery on the lapel for an eccentric touch); and the Sixth's multicoloured jacket, with its cat-shaped lapel pins, reflected the excesses of 1980s fashion. The Seventh Doctor's outfit — a straw hat, a coat with two scarves, a tie, checked trousers and brogues/wingtips — was more subdued and suggestive of a showman, reflecting his whimsical approach to life. In later seasons, as his personality grew more mysterious, his jacket, tie, and hatband all grew darker.

Throughout the 1980s, question marks formed a constant motif, usually on the shirt collars or, in the case of the Seventh Doctor, on his sleeveless jumper and the handle to his umbrella. The idea was grounded in branding considerations, as was the movement starting in Tom Baker's final season toward an unchanging costume for each Doctor, rather than the variants on a theme employed over the first seventeen years of the programme. When the Eighth Doctor regenerated, he clad himself in a 19th century frock coat and shirt based around a Wild Bill Hickok costume, reminiscent of the out-of-time quality of earlier Doctors and emphasising the Eighth Doctor's more Romantic persona.

In contrast to the more flamboyant outfits of his predecessors, the Ninth Doctor wore a nondescript, worn black leather jacket, V-neck jumper and dark trousers. Eccleston stated that he felt that such definitive "costumes" were passé and that the character's trademark eccentricities should show through their actions and clever dialogue, not through gimmicky costumes. Despite this, there is a running joke about his character that the only piece of clothing he changes is his jumper, even when trying to "blend into" a historical era. The one exception, a photograph of him taken in 1912, wearing period gentleman's clothing, resembles the style of the Eighth Doctor.

The Tenth Doctor sports either a blue or a brown pinstripe suit - usually worn with ties - a tan ankle-length coat and trainers, the latter recalling the plimsoll worn by his fifth incarnation. Also like that incarnation (and his first one), he occasionally wears spectacles: a pair with brown, thick-rimmed frames. He has also been seen wearing a pair of 3-D glasses, with red film on one side and blue on the other. In the 2007 Children in Need special he states that he doesn't actually need glasses to see, but rather wears them to "look a bit clever". On some occasions he wears a black tuxedo with matching black trainers. In interviews, Tennant has referred to his Doctor's attire as geek chic. According to Tennant he had always wanted to wear the trainers. The overall costume, however, was influenced by an outfit worn by Jamie Oliver in a TV interview on the talk show Parkinson.

The Tenth Doctor says in "The Runaway Bride" that, like the TARDIS, his pockets are bigger on the inside. The Second, Fourth and Seventh Doctors routinely carried numerous items in their coats without this being conspicuous.


Save for the off-screen transition between the Eighth and Ninth Doctors, to date each regeneration has been worked into the continuing story. Also, most regenerations (save the Second-to-Third and Eighth-to-Ninth transitions) have been portrayed on-screen, in a symbolic handing over of the role. The following list details the manner of each regeneration:

  1. First Doctor (Hartnell): apparently succumbed to old age, steadily growing weaker throughout The Tenth Planet and collapsing at the serial's end. Although the writer's intent was that this was due to the energy drain from the planet Mondas, this was not made clear in the transmitted story.
  2. Second Doctor (Troughton): a forced "change in appearance" and exile to Earth by the Time Lords in the closing moments of The War Games.
  3. Third Doctor (Pertwee): radiation poisoning from the Great One's cave of crystals at the end of Planet of the Spiders.
  4. Fourth Doctor (Baker, T): fell from the Pharos Project radio telescope in Logopolis.
  5. Fifth Doctor (Davison): spectrox toxaemia, contracted near the start of The Caves of Androzani.
  6. Sixth Doctor (Baker, C): suffered unspecified injuries when the Rani attacked the TARDIS and caused it to crash land at the start of Time and the Rani.
  7. Seventh Doctor (McCoy): died in San Franciscomarker during exploratory heart surgery by a doctor unfamiliar with Time Lord physiology, after being hospitalised for non-life threatening gunshot wounds in the 1996 television movie.
  8. Eighth Doctor (McGann): not yet revealed. Implied to be a result of the Time War.
  9. Ninth Doctor (Eccleston): cellular degeneration caused by absorbing the energies of the space-time vortex from Rose Tyler, which she in turn had absorbed through the heart of the TARDIS in "The Parting of the Ways".

In the original series, with the exception of the change from Troughton to Pertwee, regeneration usually occurred when the previous Doctor was near "death". The changeover from McCoy to McGann was handled differently, with the Doctor actually dying and being dead for quite some time before regeneration occurred. The Eighth Doctor comments at one point in the television movie that the anaesthesia interfered with the regenerative process, and that he had been "dead too long", accounting for his initial amnesia. Kate Orman's novel The Room With No Doors, set just before the regeneration, also notes that this is one of the few regenerations in which the Doctor was conscious and aware that he was dying.

The 2005 series began with the Ninth Doctor already regenerated and fully stabilised, with no explanation given. In his first appearance in "Rose", the Doctor looked in a mirror and commented on the size of his ears, suggesting to some viewers that the regeneration may have happened shortly prior to the episode, or that he has not examined himself in the mirror recently. Some draw the conclusion that the Ninth Doctor's appearances in old photographs, without being accompanied by Rose, may also suggest that he had been regenerated for some time, but these appearances could have also occurred afterwards. Russell T Davies, writer/producer of the new series, stated in Doctor Who Magazine that he has no intention of showing the regeneration in the series, and that he believed the story of how the Eighth Doctor became the Ninth is best told in other media. In Doctor Who Confidential Davies revealed his reasoning that, after such a long hiatus, a regeneration in the first episode would not just be confusing for new viewers but also lack dramatic impact, as there would be no emotional investment in the character before he was replaced.

Eccleston stepped down from the role at the end of the 2005 series, and the Ninth Doctor regenerated into the Tenth in "The Parting of the Ways". It remains to be seen whether the Ninth Doctor will appear again, although Russell T Davies has stated that he does not intend to bring back former Doctors. (Despite this, Peter Davison did briefly reprise the role of the Fifth Doctor in the 2007 Children in Need charity special alongside Tenth Doctor David Tennant.)

During the transition between the Ninth and Tenth Doctors in "The Parting of the Ways" the Ninth Doctor comments that the regeneration is totally random and until the transition is complete the Doctor has no idea of what his new appearance will be, and he states that it is possible he could come back with 'two heads'. This suggests that any future incarnations of the Doctor may not be entirely human in appearance, or indeed male.


It was established in The Deadly Assassin (1976) that a Time Lord can regenerate twelve times before permanently dying - a total of thirteen incarnations. In the 1996 television movie the Eighth Doctor explicitly said that a Time Lord has "thirteen lives". (The Doctor's enemy, The Master has, however, been shown circumventing this limit on several occasions.) In "The Christmas Invasion" it was stated the regenerative cycle creates a large amount of energy that suffuses the Time Lord's body. As demonstrated by the Tenth Doctor for the first time in that story, in the first fifteen hours of regeneration this energy is enough to even rapidly regrow a severed hand.

The Doctor's regenerations are usually as a result of his previous incarnation sustaining mortal injury or (in one case) having a change forced on him by the Time Lords. Other Time Lord regenerations, like Romana's, have not been as dramatic or painful.

The Doctor frequently experiences a period of instability and partial amnesia following regeneration. Some post-regeneration experiences have been more difficult than others. In particular, the Fifth Doctor began reverting to his previous personalities and required the healing powers of the TARDIS's "Zero Room" to recuperate (Castrovalva). The Sixth Doctor experienced extreme paranoia and flew into a murderous rage, nearly killing his companion (The Twin Dilemma). The Eighth Doctor experienced amnesia (1996 Doctor Who television movie).

The regeneration from the Ninth to the Tenth Doctor at first seemed smooth, with the Doctor regenerating standing up for the first time ("The Parting of the Ways"). However, shortly thereafter he began to experience spasms and became somewhat manic, frightening his companion as he pushed the TARDIS to dangerous extremes (Children in Need mini-episode). After crash-landing the TARDIS, the Doctor collapsed and remained unconscious for most of the next fifteen hours ("The Christmas Invasion"). The experience was traumatic enough to cause one of his hearts to temporarily stop beating.

As noted above, the newly regenerated Tenth Doctor was able to regrow his hand when it was severed at the wrist during a swordfight with the Sycorax leader. This ability had never been exhibited before.

The TARDIS also appears to aid in the regenerative process. Of the four occasions the Doctor regenerates outside the TARDIS, one was forced on him by the Time Lords (The War Games), one required a Time Lord to give the Doctor's cells a "little push" to start the process (Planet of the Spiders), one needed the TARDIS Zero Room to help him recover (Castrovalva) and the last apparently occurred a few hours after he had actually "died", leaving him with temporary amnesia (the 1996 television movie).

In "Journey's End", the Tenth Doctor manages to avert his own regeneration, using some of the energy to heal himself then channeling the remaining energy into his severed hand, thus retaining his appearance and personality. The question of whether this partial regeneration process uses up one of this thirteen incarnations is left open. Later in the episode, the energy left over from the regeneration forms a "new" Doctor when Donna Noble inadvertently causes a "human biological metacrisis". This Doctor is part Time Lord and part human, possessing the Doctor's memories and physical appearance but also inheriting some of Donna Noble's personality traits. The part-human Doctor also has only one heart, ages like a human, and cannot regenerate. At the same time, the residual energy imbues Donna with the vast intellect of a Time Lord. However, the knowledge is too much for her human mind to handle and at the end of the episode the Doctor has to block all her memories of her time with him in order to save her life.

Continuity curiosities

Over the years, different writers and production teams have introduced their own twists to the Doctor's character, sometimes as part of a grand creative reinvention; others, out of narrative convenience or outside pressures. Without one driving vision to maintain continuity, newer details may occasionally seem to contradict earlier ones. Other details — sometimes significant ones — are later ignored, sometimes leading to argument amongst series fans as to how, or whether, these details apply in a broader context.

In the early serials The Edge of Destruction and The Sensorites, it appeared that the First Doctor had only a single heart. The novel The Man in the Velvet Mask by Daniel O'Mahony suggests that Time Lords only grow their second heart during their first regeneration (speculated earlier by John Peel in The Gallifrey Chronicles). In The Mind of Evil, "The Christmas Invasion" and "The Shakespeare Code" one of the Doctor's hearts temporarily stops beating due to intense trauma.

Also during his first regeneration, and for similarly unclear reasons, the Doctor's clothes (save for his cloak and ring, both of which quickly thereafter fall off) changed along with his body (The Power of the Daleks); on all subsequent regenerations the new Doctor generally continues to wear the clothing he regenerated in until he selects a new outfit (though due to a continuity error, the regeneration from the Fourth to the Fifth Doctors included a change of footwear).

In The Brain of Morbius (produced shortly before The Deadly Assassin), visual images displayed during a mental battle between the Fourth Doctor and Morbius can be taken as implying that the Doctor had at least eight incarnations prior to the First Doctor. However, multiple dialogue references throughout the series (particularly in The Three Doctors, Mawdryn Undead and The Five Doctors) contradict this, as well as the fact that the Doctor has regenerated six times since then (as stated in "School Reunion"). Explanations have included theories that the images were of Morbius's previous incarnations (two images that are certainly Morbius also appear, and the game seems to have a symmetrical arrangement), or false images induced by the Doctor. The Doctor Who novels have suggested that these may have been faces of the Other, a figure from Gallifrey's ancient past and the genetic predecessor of the Doctor (although being from the tie-in novels, the canonicity of this character is debatable). The producers, however, intended that these were, in fact, figures from the Doctor's past. Producer Philip Hinchcliffe has said, "We tried to get famous actors for the faces of the Doctor. But because no one would volunteer, we had to use backroom boys. And it is true to say that I attempted to imply that William Hartnell was not the first Doctor." Other indications are given on screen to suggest the same thing, such as the references from the 'Cartmel Masterplan' and the secondary control room, which the Doctor says he used before (The Masque of Mandragora). The alternate console room also contained articles connected to the second (a recorder) and third (a ruffled-front shirt) Doctors, suggesting use of the room during those incarnations.

In the Sixth Doctor story arc The Trial of a Time Lord, a Time Lord with the title of the Valeyard (played by Michael Jayston) was revealed to be a potential future Doctor, a "distillation" created somewhere between his twelfth and final incarnations and embodying all the evil and malevolence of the Doctor's dark side. The Valeyard was defeated in his attempt to actualise himself by stealing the Sixth Doctor's remaining regenerations, however, and so may never actually come to exist.

The idea of an "in-between" version of the Doctor has its precedents. In Planet of the Spiders, a Time Lord's future self (described as a "distillation" of the future incarnation) was shown to exist as a corporeal projection that assisted his then-current incarnation. In Logopolis, an eerie and mysterious white-clad figure known as the Watcher assisted in the transition between the Fourth and Fifth Doctors. Nyssa commented that the Watcher "was the Doctor all the time" as he merged with the supine form of the fourth Doctor, regeneration beginning just before the merging is complete.

Perhaps the most controversial element from the 1996 television movie was the revelation that the Doctor is half-human ("on [his] mother's side"). The spin-off novels and audios have tried various methods to explain this revelation, suggesting that the Doctor retained some human DNA from his time as Dr John Smith (in which the Doctor, using bought technology, became biologically human with a different persona unaware of his Time Lord self) in the Virgin New Adventures novel Human Nature, that his origins have become muddied by agents manipulating his personal timestream (the Eighth Doctor Adventures novel Unnatural History), or that only his mother's incarnation at the time of his birth was Human. In the New Series Adventures novel The Deviant Strain by Justin Richards, the Doctor comments that his DNA is "close" to that of humans. In the IDW Comics story "The Forgotten," the Eighth Doctor remarks that he simply convinced the Master he was half-human, "with nothing more than a wide-eyed expression, a couple of words, and a half-broken Chameleon Arch." However, as noted above, the canonical nature of the novels and comics is uncertain. The idea of a "half-human" Doctor is further discredited by the 2008 series finale "Journey's End", wherein the Doctor expresses dismay at his "half-human" double, and explicitly states that a human/Time Lord cross such as Donna becomes in that story has never existed before; events later in the episode show the latter combination to be inherently unstable.

The Time Lord ability to change species during regeneration is referenced by the Eighth Doctor in relation to the Master in the television movie, being supported by Romana's regeneration scene in the 1979 serial Destiny of the Daleks. The Daleks also implied during the events of The Daleks' Master Plan (1965–66) that the First Doctor's humanoid form is not his actual appearance. The new series has not made any allusions to mixed parentage, simply referring to the Doctor as "alien" or "Time Lord". However, the trade paperback Doctor Who: The Legend Continues by Justin Richards, published to coincide with the new series, refers to the Doctor as half-human. The 2007 Tenth Doctor episodes "Human Nature" and "The Family of Blood", adapted from the above-mentioned Seventh Doctor novel, Human Nature, also show the Doctor using technology to become biologically human, although he does so through Time Lord science. Later, in "Utopia", the Master is revealed to have undergone the same process.

When incarnations meet

Due to time travel, it is possible for the Doctor's various incarnations to encounter and interact with each other, although this is supposed to be prohibited by the First Law of Time (as stated in The Three Doctors) or permitted only in the "gravest of emergencies" (The Five Doctors). In the 1963–1989 television series, such encounters were seen on three occasions, in The Three Doctors (1972), The Five Doctors (1983) and The Two Doctors (1985). In Day of the Daleks (1972), the Third Doctor and Jo Grant very briefly met their future selves due to a glitch during a temporal experiment (the serial was supposed to end with the same scene depicted from the perspective of the "other" Doctor and Jo, but was excised because it was anticlimactic). In "Father's Day" (2005), the Ninth Doctor and Rose observed but did not interact with past versions of themselves; when Rose changed history, the earlier selves vanished and a temporal paradox was created that attracted the extradimensional Reapers. The Tenth and Fifth Doctors met in the TARDIS in the mini-episode "Time Crash", which aired on 16 November 2007 as part of the BBC's annual Children in Need appeal. This marks the first time the Doctor has met a previous incarnation since the show's revival. Although the scene aired outside the series itself, it was established as taking place between the events of "Last of the Time Lords" and "Voyage of the Damned."

The BBC novel The Eight Doctors was written by respected Doctor Who writer Terrance Dicks, the same author who wrote The Five Doctors. In it, he tries to reconcile the continuity errors of the 1996 movie, while having the Eighth Doctor meet and interact with each of his previous selves.

Physical contact between two versions of the same person can lead to an energy discharge that shorts out the "time differential". This is apparently due to a principle known as the Blinovitch Limitation Effect, and was seen when the past and future versions of Brigadier Lethbridge-Stewart touched hands in Mawdryn Undead. Oddly, the Doctor's incarnations do not appear to suffer this effect when encountering each other and shaking hands. This has never been explained. An essay in the About Time series by Lawrence Miles and Tat Wood suggests that Time Lords are somehow exempt from the effect by their very nature. Rose Tyler is seen holding an infant version of herself in "Father's Day", with no visible energy discharge, but the contact does allow the Reapers to enter the church in which the Doctor and several others are taking refuge. While doing a live commentary on the episode at the 2006 Bristol Comic Expo, episode author Paul Cornell said that this is supposed to be due to the Blinovitch Limitation Effect, even though it is not mentioned by name. He also suggested that the lack of a spark may be down to the fact that the Time Lords were no longer around to manage anomalies.

The interaction of the Doctor's various incarnations produces a continuity anomaly that requires suspension of disbelief on the part of viewers, as one may assume that his past selves would forget that he would later regenerate. In Castrovalva, the newly-regenerated Fifth Doctor clearly indicates that the outcome of his regeneration cannot be predicted; however, the Fifth Doctor should have had memories from his earlier incarnations of having met himself per the events of The Three Doctors and The Five Doctors. Also, the Second, Third and Fifth Doctors should be already familiar with the events of The Five Doctors, having already lived through them multiple times. It has been suggested in fandom that the Time Lords erase the Doctor's memory after such encounters (and in The Two Doctors there is mention of Dastari administering to the Second Doctor a drug that he bemoans "affects the memory"); the novel The Empire of Glass features the First Doctor directly after his return from the events of The Three Doctors, his memory of the adventure having been totally erased barring a vague recollection of meeting "a dandy and a clown". The Virgin Missing Adventures novel Cold Fusion by Lance Parkin suggests that memory-erasure is sometimes, but not always, due to something called "Blinovitch Conservation".

In the 2006 episode "School Reunion", the Tenth Doctor and Sarah Jane Smith both seem to indicate in dialogue that they haven't seen each other since her departure from the TARDIS in The Hand of Fear, although this contradicts their having met later during The Five Doctors. She, in that story, does not realise that the Fifth Doctor is a later incarnation of the third and fourth Doctors with whom she had previously travelled. In "Time Crash", the Tenth Doctor remembers and reproduces what he saw himself do when he was the Fifth Doctor, a fact that seems to surprise the Fifth Doctor himself.

Russell T Davies has expressed a dislike for stories in which multiple incarnations of the Doctor meet, stating that he believes they focus more on the actors than on the story itself. David Tennant had shown enthusiasm for the idea of a multi-Doctor story, opening the possibility of further appearances by Paul McGann and Christopher Eccleston. However, he has expressed doubts about the practicality of shows involving multiple previous Doctors, given that three of the actors who played the character are now deceased.

Since the series revival, there has been one multi-Doctor story, the Children in Need special Time Crash. Before that, the only references to past incarnations (from 1963 to 1996) have been in the aforementioned episode "School Reunion" (in which the Doctor acknowledges having regenerated "half a dozen times" since last seeing Sarah Jane) and in drawings that the Doctor (who has temporarily become human to hide from the Family Of Blood) makes based on dreams of his other life in the 2007 episode "Human Nature". Seen on screen are the First, Fifth, Sixth, Seventh and Eighth Doctors, but a fuller view briefly available on the BBC website depicted all ten incarnations. However in the 2008 Christmas episode, The Next Doctor, the Tenth Doctor discovers an info stamp originally held by the Cybermen, which includes images of all his past selves. This is a clear affirmation of his past.

Time Crash featured Peter Davison returning as the Fifth Doctor. This event is explained as occurring due to the current Doctor having left his shields down when rebuilding the TARDIS following "Last of the Time Lords" and then accidentally crossing the Fifth Doctor's timeline, allowing the two TARDISes to merge. When the Tenth Doctor effortlessly averts the impending Belgiummarker-sized hole in the Universe caused by this temporal anomaly, he reveals having known what to do because he saw himself do it as the Fifth Doctor and remembered. He goes on to tell the Fifth Doctor how fond he was of his incarnation and how he influences the current Doctor's personality.
However, one incarnation of the Doctor has often been known to be critical of other incarnations - in their two meetings, the Second Doctor and Third Doctor had a mild antagonism towards each other, with the patriarchal First Doctor critical of them both.

Reprising the role

On a few occasions, previous Doctors have returned to the role, guest-starring with the incumbent:

  • William Hartnell and Patrick Troughton with Jon Pertwee in The Three Doctors. Originally Hartnell's role had been intended to be more extensive, but his health had deteriorated to the extent that he could only make a limited appearance. In the end, it turned out to be his last television role.
  • Troughton and Pertwee with Peter Davison in The Five Doctors, the twentieth anniversary special, with another actor, Richard Hurndall, standing in for the late William Hartnell (the story began with a clip from The Dalek Invasion of Earth featuring Hartnell himself). Tom Baker declined to appear, feeling that the role came too soon after he had left the programme (a decision he later said he regretted) and the narrative was reworked to use clips from Shada, an intended six-part story from the Fourth Doctor's era that was never completed due to industrial action. A waxwork dummy of Baker from Madame Tussaudsmarker was used in the publicity photographs.
  • Patrick Troughton with Colin Baker in The Two Doctors.
  • Jon Pertwee, Tom Baker, Peter Davison, Colin Baker, and Sylvester McCoy — with rubber dummy heads standing in for the late William Hartnell and the late Patrick Troughton — in Dimensions in Time, a charity special in aid of Children in Need in 1993, the programme's 30th anniversary year. Except for the mannequin versions of Hartnell and Troughton, no two Doctors are shown on screen at the same time. (This story was a crossover with EastEnders).
  • Peter Davison, Colin Baker and Sylvester McCoy in the first Big Finish audio adventure, The Sirens of Time.
  • Peter Davison, Colin Baker, Sylvester McCoy and Paul McGann, with Jon Pertwee posthumously joining them by virtue of an extant fan recording, in the audio adventure Zagreus, a fortieth anniversary special and the fiftieth release.
  • Colin Baker and Sylvester McCoy in the second half of the audio Project Lazarus, although the Sixth Doctor in this story is later revealed to be a clone of the Sixth Doctor created from DNA samples extracted during his previous visit rather than the actual Doctor.
  • Peter Davison with David Tennant in the 2007 Children in Need special "Time Crash".

Other actors have portrayed the character of the Doctor outside of the television series. For details on this see under Adaptations and other appearances in the main article and Doctor Who spin-offs.

For a list of all actors who have played the Doctor see List of actors who have played the Doctor.


In early production documents, the Doctor was said to be 650 years old, although this was never stated on screen. By the time the Doctor did cite his age ("Let me see, in human terms, 400, yes, 450 years" in the serial The Tomb of the Cybermen; he also kept a 500-year diary), he had already regenerated to a younger form. The intention at that time was that regeneration had turned back the Doctor's clock, making him younger both in appearance and in biological age. Since the Doctor's age had never previously been given, 450 Earth years became a starting point onto which further years would be progressively added as the series continued and the character lived out his further incarnations.

The Third Doctor implied in Doctor Who and the Silurians and in The Mind of Evil that he had a lifetime that covered "several thousand years", though in either case he may have been referring to the breadth of time he had visited (or was able to visit) rather than actually lived through, or perhaps his own life expectancy. While the Doctor's age has never been a known quantity, these numbers are the most difficult to reconcile with the rest of the series.

By the time of The Brain of Morbius, the Fourth Doctor was stated to be 749 years old ("something like 750 years" in the prior Pyramids of Mars). In The Ribos Operation, the first Romana said the Doctor was 759 years old and had been piloting the TARDIS for 523 years, making him 236 when he first "borrowed" it. When the Doctor encounters his old friend Drax in The Armageddon Factor, Drax says it has been 450 years since their time together at the Academy, suggesting that the Doctor was roughly 299 years old then. Drax also implies that the Doctor got his doctorate after that.

In Revelation of the Daleks the Sixth Doctor was 900 years old, and in Time and the Rani, the Seventh Doctor's age was 953, the same as villainous Time Lady the Rani (in both serials, the Doctor's age is stated in dialogue). In Remembrance of the Daleks the Seventh Doctor said that he had "900 years’ experience" rewiring alien equipment. At the beginning of the 1996 television movie, the Seventh Doctor was shown to have a 900-year diary in his TARDIS.

In the spin-off prose fiction, the Sixth Doctor celebrated his 991st birthday in the short story "Brief Encounter: A Wee Deoch an..?", written by Colin Baker himself, in Doctor Who Magazine Winter Special 1991: UNIT Exposed, while the Seventh Doctor celebrated his 1,000th birthday in Set Piece by Kate Orman, and the Eighth Doctor declared his age to be 1,012 in Vampire Science by Orman and Jonathan Blum. The Eighth Doctor spent nearly a century on Earth during a story arc spread over several novels, and also spent around 100 years asleep in The Sleep of Reason by Martin Day. Furthermore, in the Big Finish Productions audio play Orbis the Eighth Doctor says that he has spent 600 years living on the planet Orbis since the last play Vengeance of Morbius. In the same play he states that he lost count of his true age a long time previously and that he rounds it down and takes into account the different lengths of what is called a "year" in different locations.

In the 2005 series, the Doctor's age is stated in publicity materials as 900 years, and in "Aliens of London", he says, "Nine hundred years of time and space, and I've never been slapped by someone's mother." Rose follows up by asking him if he is 900 years old, and he replies affirmatively, though it is unclear whether he is being disingenuous. He restates this as "Nine hundred years of phone box travel and it's the only thing left that surprises me", however, in "The Empty Child". In "Voyage of the Damned", the Tenth Doctor states that he is 903 years of age, the first time since Time and the Rani that an exact number has been stated in dialogue; previously, the Master also indicated the Doctor's age to be about 900 in the "The Sound of Drums"/"Last of the Time Lords" story arc.

How this figure is to be reconciled with the Doctor's age in the rest of the series and spin-off media is uncertain.

In the 2006 episode "Rise of the Cybermen", the Doctor transfers part of his life energy to a component of the TARDIS in hopes of regenerating the disabled craft; he states that he has given up ten years of life in doing so.

At the end of "The Sound of Drums", the Master ages the Doctor by 100 years using his laser screwdriver, leading the Doctor to assume an elderly appearance. In "Last of the Time Lords", the Master states to the population of Earth that the Doctor is nine hundred years old, and informs his subjects he will show them the Doctor's true form, suspending his ability to regenerate. The Master proceeds to age the Doctor further with his laser screwdriver, reducing him to a tiny, wrinkled being subsequently imprisoned inside a bird cage until reverted to his current form with the help of Martha Jones, 15 satellites and the entire population of Earth.


In the very first episode of the television series it is established that Susan Foreman is the Doctor's granddaughter, but neither Susan nor the Doctor ever speak of her parents. In "Fear Her" (2006), the Doctor states that he was "a dad once", suggesting that he reproduced at some point. Furthermore, in "The Doctor's Daughter", he says he fathered offspring, now dead. Thus, the Doctor's family history, including the time period "before" the beginning of the series, is largely a matter of conjecture.

During the initial series, William Hartnell's age precluded any involvement of the character with the only other female lead at the time. The First Doctor did flirt with — and was accidentally engaged to — the character Cameca in The Aztecs; although this was part of a plot to get the TARDIS back, there was a hint of mutual attraction in Hartnell's performance (especially as he is ultimately unable to leave behind the love token she has given him). The fact that the TARDIS crew kept pressing forward in their travels was probably also a factor in preventing any romantic attachments.

As the series progressed and grew more popular among children, the Doctor was firmly established as an avuncular figure to his younger companions, the one exception being the Third Doctor's hurt reaction to his companion Jo Grant's leaving him for an idealistic scientific adventurer whom she describes as "a younger version" of the Doctor (The Green Death). Jo kisses the Doctor on the cheek before she departs, the second time this form of affection had been shown on screen (the second Doctor having similarly kissed Zoe in The War Games).

Despite the press (and, occasionally, the production team) trying to play up the sexiness of some of the female companions or suggesting "hanky panky" in the TARDIS, the series reached the point where any suggestion of the Doctor as a sexual being was avoided altogether. One example was during City of Death, when the Fourth Doctor says to Countess Scarlioni, "You're a beautiful woman, probably," suggesting that he is incapable of appreciating a human woman's attractiveness. This rule held true even when the Doctor's apparent age was closer to those of his companions, or if there was on-screen chemistry between the actors, as there was between Fourth Doctor Tom Baker and his wife-to-be Lalla Ward's Romana II. In fact, a 1980 television commercial broadcast in Australia for Prime Computers showed Baker and Ward romancing each other, in character as The Doctor and Romana, with the commercial ending with The Doctor (prompted by the computer) proposing marriage. These commercials are not, of course, part of the regular series continuity.

In some of the voice overs on Peter Davison's DVDs the matter of physically expressed sexual attention is discussed. According to Peter Davison and Matthew Waterhouse (Adric), John Nathan-Turner had very strict rules laid down about how the companions were allowed to physically interact with the Doctor, and Adric was allowed more physical contact with the Doctor than the female companions to downplay any potential romantic and/or sexual connotations.

The perception of the Doctor as essentially an asexual character, uninterested in romance, is why some portions of fandom reacted so strongly to the Eighth Doctor (Paul McGann) kissing Dr. Grace Holloway in the 1996 television movie, breaking the series' long-standing taboo against the Doctor having any romantic involvement with his companions.

Spin-off passion

However, the spin-off media both before and after the television movie have toyed with the idea in various ways. In the 1995 Virgin New Adventures novel Human Nature by Paul Cornell, the Seventh Doctor takes on the human guise of "Dr John Smith" and has a romance with a school nurse in 1913, albeit as a means to understand the human condition and with the Doctor's own memories as a Time Lord suppressed. This novel was adapted to the screen and comprised two episodes in the new series: "Human Nature" and "The Family of Blood". The Doctor became human and his Time Lord essence was locked away in a watch. He fell in love with a nurse, while Martha jealously looked on.

The concluding chapter of The Dying Days, an Eighth Doctor novel by Lance Parkin, strongly implies intimacy occurring between the Doctor and Bernice Summerfield. In the Virgin novel Death and Diplomacy, by Dave Stone, the Seventh Doctor implies that he intentionally creates an image of asexuality to keep things simple.

In various novels — especially Lungbarrow — it is also established that Time Lords do not reproduce sexually, but emerge from genetic Looms fully grown, although in equivocal fashion the same book also hints that the Doctor's birth was an exception. This idea was brought to the forefront in the '96 movie, where the Doctor states he is "half-human, on [his] mother's side", suggesting he had a normal human birth, rather than a synthetic Gallifreyan one. Madame de Pompadour's reference to the Doctor's lonely childhood in "The Girl in the Fireplace" would also seem to contradict the Loom theory. The 2007 episode "The Sound of Drums" also directly contradicts this, with Gallifreyan children leaving for the academy when they reach the age of 8. This episode also shows a young Master.

The classic series also made occasional references to the Doctor's childhood on Gallifrey (The Time Monster, State of Decay and Black Orchid), and there had been the occasional reference to Gallifreyan children, also referred to as "Time Tots" by Romana in the audio adventure Zagreus and the incomplete 1979 serial Shada.

In the Big Finish Productions audio play Loups-Garoux, the Fifth Doctor reluctantly agrees to marry the werewolf Ileana De Santos and although he gets out of it later, as in Cameca's case, a degree of mutual attraction is present. In the plays involving the Eighth Doctor, his companion Charley confesses her romantic feelings for him in Zagreus, but although he admits he loves her back at the time, it is a highly dramatic moment and the relationship does not progress beyond the platonic.

The recurring novel and audio character Iris Wildthyme, created by Paul Magrs, is first introduced in the Short Trips story Old Flames, is a past romantic interest of the Doctor's who continues to flirt with him whenever they meet. In the audios Iris is played by Katy Manning, the actress who had formerly played Jo Grant during the Third Doctor's era. More of the Doctor's past relationships are explored in The Infinity Doctors and Cold Fusion.

The question of romance is sometimes side-stepped with plot devices in the spin-off media. In the 2001 BBC Books novel Father Time by Lance Parkin, the Doctor adopts an orphaned Gallifreyan-like alien called Miranda. It is implied in the book that Miranda is actually the daughter of the Doctor himself from the far future. Miranda returns in the novel Sometime Never... by Justin Richards, with her own daughter Zezanne. At that novel's end, a time-active being called Soul travels into the past accompanied by Zezanne, the two believing themselves to be the Doctor and Susan, respectively.

Modern-day romance

The 2005 series played with the idea of a romantic relationship between the Ninth Doctor and Rose Tyler, with many characters assuming they were a couple (although they always both denied it), and Rose's boyfriend Mickey Smith clearly viewing the Doctor as a romantic rival for whom Rose has, in some sense at least, left him. Both showed flashes of jealousy when the other flirted with other characters.

In the finale for that season, "The Parting of the Ways", the Doctor even kissed Rose (although the kiss also served a plot purpose). In the same episode, the Doctor's male companion Jack Harkness kisses both the Doctor and Rose in what he believes is a last goodbye. In the New Series Adventures novel Only Human by Gareth Roberts, Rose asks the Doctor how he would know that marrying for love is overrated, to which he cryptically answers, "Who says I don't? You ask the Lady Mary Wortley Montagu." In a December 2005 interview on BBC Four, actor David Tennant, who had just taken the role of the Tenth Doctor, described the relationship between the Doctor and Rose as "basically a love story without the shagging".

In the 2006 series, Rose kisses the Doctor in "New Earth", but she is possessed by Cassandra at the time. In "School Reunion", the arrival of the Doctor's previous companion Sarah Jane Smith and his reaction to seeing her again prompts jealousy and worry from Rose, and Sarah all but admits that she has long been in love with the Doctor. In the same episode, the Doctor hints at deeper feelings for his companions when he remarks to Rose that humans wither and die, and it is hard to watch that "happen to someone who you..." but leaves the rest unsaid. In the following episode, "The Girl in the Fireplace" (written by Steven Moffat), the Doctor shares a passionate kiss and a strong romantic connection with Madame de Pompadour, who takes him away to "dance", but how far the metaphor (coined in the episode "The Doctor Dances") is taken is not seen on screen. Although Rose does not seem to exhibit jealousy towards Madame de Pompadour, she does show some jealousy with regards to a woman called Lucy whom the Doctor speaks kindly of in the next episode, "Rise of the Cybermen". In the novel The Stone Rose, by Jacqueline Rayner, the Doctor kisses Rose after she saves him from being petrified, although it is described as "a kiss of gratitude and joy and unspeakable pleasure at being alive."

In "The Impossible Planet" the Doctor and Rose share an awkward moment when they have to consider settling down in one time period and Rose suggests they do so together, and she later plants a kiss for good luck on the Doctor's spacesuit prior to his descent into the pit. In "The Satan Pit" the Doctor tells Ida Scott that Rose already knows how he feels about her, saying "If you see Rose, tell her...tell her...oh, she knows". In "Doomsday", when the Doctor says his goodbyes to Rose, she finally tells him that she loves him. He begins to reply, but only gets as far as saying her name before he gets cut off, and the next scene shows him standing silently alone, a single tear down his cheek, whatever words he had intended to say remaining unspoken. In the audio commentary for the episode, executive producer Julie Gardner had stated that "he absolutely was going to say it...he was going to tell her he loved her."

In "Smith and Jones", the Doctor says that he would rather 'be alone'. He kisses his new companion, Martha Jones, but only as a "genetic transfer" to distract their pursuers and he is extremely alarmed when she attempts to flirt with him on the TARDIS. The Doctor tells Martha that he and Rose "were together", and is clearly upset over losing her, although Martha points out that it was the Doctor who initiated their kiss and that he chose to take her away in the TARDIS (and moreover, she states that she 'only goes for humans', albeit to hide her disappointment).

Later, in "Daleks in Manhattan", Martha confesses to Tallulah that she is attracted to the Doctor (though Tallulah euphemistically guesses that the Doctor is "into musical theatre", implying that she believes the Doctor is gay). In "Human Nature", as in the original novel, the Doctor's human self, John Smith, falls in love with Joan Redfern (now a nurse, rather than a science teacher) and Martha notes that the Doctor 'had to fall in love with a human' other than herself. When the Doctor is himself again at the end of "The Family of Blood" — during which Martha admits, in an attempt to convince Smith to change back to being the Doctor, that "he is everything to me, and he doesn't even look at me, but I don't care, because I love him to bits, and I hope to God he won't remember me saying this" — he tells Joan he is capable of everything that Smith was, but she rejects his attempt to establish a relationship with her as the Doctor. In the following episode, "Blink", he refers to being "rubbish at weddings, especially my own".

In the penultimate 2007 series episode "The Sound of Drums", The Doctor adds a perception filter to the TARDIS keys, allowing the trio to move about unnoticed. When he explains the perception filter to Martha and Jack, Martha is confused at first, but then the Doctor describes it as " when you fancy someone, and they don't even know you exist." As Martha stares incredulously at him, Jack looks at her sympathetically and says, "You too, huh?" Martha unambiguously states in the season finale, "Last of the Time Lords" that she is in love with the Doctor and ultimately chooses to leave him as he seems unable or unwilling to reciprocate.

In the 2008 series various characters assume the Doctor and Donna Noble to be a couple (apart from Agatha Christie in "The Unicorn and the Wasp", who notices that they have no wedding rings), which the pair, having mutually agreed in "Partners In Crime" to strictly be friends, always strongly deny, comprising a running gag. This makes Donna the first companion of the new series - apart from brief companions Adam and Mickey - to not have a romantic interest in the Doctor. In "The Unicorn and the Wasp", the Doctor is kissed by Donna, although it is an act to help him expel poison from his body by shocking him rather than a romantic gesture. In the two-part story "Silence in the Library"/"Forest of the Dead", the character Professor River Song reveals herself to be a future companion of the Doctor, and although the exact nature of her relationship with his future self remains unrevealed, it is intimate enough that she is openly affectionate towards him and is the only known person to be told his true name.

At the conclusion of the 2008 series finale "Journey's End", the Doctor returns Rose Tyler to her parallel universe, asking her to help his part-human, part-Time Lord copy. Rose then asks both Doctors what he was going to say back on Bad Wolf Bay the last time they were there. While the original Time Lord Doctor sadly replies: "Does it need saying?", the part-human Doctor whispers something in her ear, and they passionately kiss. Series executive producer Julie Gardner commented in Doctor Who Confidential that although the audience cannot hear, it is obvious that he is saying "I love you". The Time Lord Doctor then leaves in the TARDIS allowing Rose and the part-human Doctor to have a life and grow old together.


While over the decades several revelations have been made about his background — that he is a Time Lord, that he is from Gallifrey, among others — the writers have often strived to retain some sense of mystery and to preserve the eternal question, "Doctor who?". This back-story was not rigidly planned from the beginning, but developed gradually (and somewhat haphazardly) over the years, the result of the work of many writers and producers.

This has led to continuity problems. Characters such as the Meddling Monk, expressly said to be from the same planet as the Doctor, were retroactively labelled Time Lords, early histories of races such as the Daleks were rewritten, and so on. Series writer Paul Cornell, discussing continuity errors, opines that the modern series' "Time War" can explain away (or retcon) such discontinuities, giving the example of Earth's different destructions in The Ark (1966) and "The End of the World" (2005). Writer and future Doctor Who executive producer Steven Moffat has gone further, arguing that "a television series which embraces both the ideas of parallel universes and the concept of changing time can't have a continuity error — it's impossible for Doctor Who to get it wrong, because we can just say 'he changed time'". ;

Some of the stories during the Seventh Doctor's tenure, part of the so-called "Cartmel Masterplan", were intended to deal with this issue by suggesting that much of what was believed about the Doctor was wrong and that he was a far more powerful and mysterious figure than previously thought. In both an untelevised scene in Remembrance of the Daleks and the subsequent Silver Nemesis it was implied that the Doctor was "more than just another Time Lord". The suspension of the series in 1989 means that none of these hints were ever resolved. The "Masterplan" was used as a guide for the Virgin New Adventures series of novels featuring the Seventh Doctor, and the revelations about the Doctor's origins were written into the novel Lungbarrow by Marc Platt. However, the canonicity of these novels, like all Doctor Who spin-offs, is unclear.

Other appearances


  1. Doctor Who: The Classic Series - Episode Guide
  2. "the eponymous Time Lord, with a blood temperature 20 degrees below that of humans" in Lewis, J.E. and Stempel, P. The Ultimate TV Guide (Orion media 1999 ISBN 0-75281-805-8), p. 102
  3. Steven Moffat talks 'Doctor Who' future, Digital Spy, November 1, 2009.
  4. Radio 7 Programmes - Doctor Who - Previous episodes
  5. Doctor Who Confidential; 8 May 2008
  6. We do not see Patrick Troughton turn into Jon Pertwee's Doctor. The War Games had Troughton spinning away into darkness as the serial ended and the next time we saw the Doctor in Spearhead from Space it was Jon Pertwee who stumbled out of the TARDIS, wearing Troughton's clothes. This left a possible gap between War Games and Spearhead into which some have inserted a hypothetical "Season 6B" for the Second Doctor (see The Two Doctors).
  7. Colin Baker did not actually appear in the regeneration scene from Time and the Rani, as he declined to participate. Instead, Sylvester McCoy was seen briefly, wearing a blond wig, with his facial features obscured by a video effect before he regenerated into the Seventh Doctor. According to the Past Doctor Adventures spin-off novel Spiral Scratch, the Sixth Doctor was exhausted by a battle with a Lamprey and his regeneration had already begun when the tractor beam of the Rani ensnared the TARDIS. The canonicity of this event is unclear.
  8. Paul McGann did not return to film a regeneration scene, nor was a regeneration scene filmed with another actor to link between the 1996 television movie and the 2005 series (although in an interview for the British magazine SFX he claimed that he was "more than happy" to return to film such a scene). No reason is given for the Doctor's regeneration into his ninth incarnation but several episodes have implied it was a consequence of the Time War. However, in 2007, the essay "Flood Barriers" by Doctor Who Magazine comic strip editor Clayton Hickman ("Flood Barriers", in Doctor Who: The Flood - The Complete Eighth Doctor Comic Strips Vol. 4 (Panini Books, ISBN 978-1-905239-65-8) revealed that Davies had authorised the strip to depict the regeneration as occurring at the end of the arc The Flood. The Doctor would have been shown regenerating as a consequence of being exposed to the Time Vortex (the same cause as that which triggered his next regeneration) after thwarting a Cybermen invasion. The plan to depict the regeneration was dropped because the writers weren't allowed to include the strip's then-current companion, Destrii, in the regeneration or aftermath.
  9. Lance Parkin, A History of the Universe pg. 255
  10. Cornell, Paul, Day, Martin, and Topping, Keith (1995). Season 6 (b) and The Masque of Mandragora (reprinted on BBC Doctor Who website). The Discontinuity Guide. London: Virgin Books. pp. 106, 194. ISBN 0-426-20442-5.
  11. Pixley, Andrew, "The DWM Archive: The Day of the Daleks," Doctor Who Magazine, #501, 7 March 2001, p.31 (sidebar: "Editing Episode Four").
  12. The Tom Baker Years
  13. Doctor Who: Voyage of the Damned, BBC TV, Dec. 25, 2007
  14. Doctor Who in Advertising: The Pr1me Computer Commercials By Jon Preddle accessed 22 February 2007
  15. Comic Relief - Dan Dare
  16. Paolini, Christopher. "Acknowledgements". Brisingr. Doubleday 2008. p 763.


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