The Doctor came from the planet Gallifrey, in the constellation of Kasterborous, home of the Time Lords. Details of his early life are unknown, but he attended the Time Lord Academy, where his best friend was the man who was destined to become his greatest nemesis, the Master. The Doctor eventually stole an obsolete type 40 TARDIS and fled Gallifrey in it, apparently accompanied by his granddaughter (who took the name Susan Foreman on Earth) in order to experience the universe for himself. Over the years he traveled the universe with numerous companions including his granddaughter Susan, K9, Sarah Jane Smith, Sharon Davies, and Ace, meeting allies like the shadow man Shayde, Death's Head, Kroton, Ivan Asimovf, the Freefall Warriors, Max Edison and Abslom Daak, Dalek Killer, and battling powerful monsters and villains such as the Daleks, Cybermen, the Master, Beep the Meep, the Time Witch, the Malevilus, the demon Melanicus, and countless others. Although he was eventually captured by the Time Lords and exiled to Earth in the 20th Century for a time, where he found employment with the paramilitary organization UNIT, he was later given his freedom by the Time Lords after assisting them against their insane former hero, Omega. The Doctor continues to explore and defend the universe across time and space.
The Doctor has extensive knowledge and experience in the fields of science, history, medicine, technology, and many others. He knows how to hypnotize normal humans, is a skilled swordsman and marksman, and has limited telepathic abilities.
Near-immortality: As a Time Lord, the Doctor has a radically slowed ageing process and can potentially live for hundreds or even thousands of years before needing to regenerate into a new body. In the most current accounts, the Doctor is more than 900 years old. Despite this, he (usually) has the appearance and physical ability of a man in his prime. The Doctor can live indefinitely in one form  but has noted he will not always be immune to the effects of ageing, such as senility, if he does so.
Regeneration: The Doctor's most famous power is his ability to regenerate into a new body upon sustaining a mortal injury or reaching advanced age. While the physical appearance and personality is changed completely, his memories remain mostly (but not completely) intact. This allows the Doctor to live almost indefinitely. The standard number of regenerations a Time Lord can use is twelve although that can be changed. The early stages of Regeneration also allows Time Lords to regrow severed limbs. Regeneration also allows Time Lords to use powerful energy as a concussive force capable of incapacitating, or even destroying, multiple foes.
Accelerated Healing Factor: The Doctor often shows impressive healing abilities. While not on par with someone like Wolverine, Time Lords can heal from broken bones in a few days, non-lethal bullet wounds in a day, survive falls from great heights, and even regrow one of their hearts in a few months.  As noted, a Time Lord soon after regeneration is able to regrow severed limbs  or even survive otherwise-lethal gunshot wounds. Time Lords often slip into comas to recover from extreme damage that made them appear dead. 
Telepathy: The Doctor possesses limited telepathic abilities and is a skilled hypnotist. This is a trait shared by all Time Lords and which allows them to communicate and rapidly share information and the Doctor is also able to confer this ability to humans temporarily as well as share information quickly.
Time Lord Physiology: The Doctor's enhanced physiology allows him to survive on less oxygen than a human requires, to the point of possessing a 'respiratory bypass', have an increased resistance to poisons and toxins, and possess radically enhanced senses compared to humans. He can even briefly endure the hard vacuum of space due to the above mentioned respiratory bypass system.
Enhanced Senses: Time Lords possess all of the senses of a human being to a heightened level. Their eyes can see in the dark better than humans and see objects hundred of yards away with nearly perfect clarity, they can also hear across large distances,
Super-Genius Level Intellect: Time Lords are among the smartest species in the Universe and the Doctor shows extensive knowledge of many areas, such as human and alien sciences, technology, history, medicine, mechanics, and engineering, etc. to the point of literally beyond comprehension of what humans and many other aliens are capable of. The Doctor is also an excellent tactician and has taken down many powerful enemies using his cunning.
- Master Swordsman: The Doctor is an expert swordsman, having been trained by some of the best fencing experts in the universe. He has shown amazing skill with a blade on multiple occasions.
- Olympic Level Athlete: The Doctor is an outstanding athlete, being able to sprint great distances, and even once cleared a fence.
- Exceptional hand-to-hand combatant: When in his third incarnation, the Doctor stated he practiced a form of martial arts known as Venusian Aikido.
- Fourth Doctor: In his fourth incarnation, The Doctor was able to deliver one punch to himself from a previous time, to knock himself out.
- Sixth Doctor: The Doctor's sixth incarnation was also shown to be quite skilled in hand-to-hand combat, being able to disarm, and take down an armed assassin in an alley.
The Doctor once claimed Aspirin could kill him. Various events have triggered the Doctor's regenerations – radiation, falling from great heights, old age, and botched exploratory heart surgery. It can be assumed that when the Doctor reaches his final life, any of these examples and others would be able to kill him for good. Regeneration is an unpredictable process that could fail, and often can be upsetting physiologically.
Sonic screwdriver. This innocent-looking device is the Doctor's favorite tool. The Doctor can reprogram it to manipulate sound and matter in nearly infinite combinations. Early versions were mainly used for opening doors and undoing screws.
Few to none. The Doctor prefers using brain instead of brawn, but he has only been witnessed wielding guns on exceedingly rare occasions, sometimes using them as lethal force, sometimes not.. If he needs to use a gun, he will commandeer it, such as in The Forgotten, where his sixth incarnation used it to demonstrate the gun's capability to fire intangible bullets that pass through obstacles on its way to its target. However, as mentioned above, he is an expert swordsman.
The Master: The Doctor's arch enemy, a rival Time Lord and a master hypnotist. His super-genius level intellect combined with his charisma and his insanity makes him one of the universe's greatest threats. 
Josiah W. Dogbolter: Dogbolter is half-man, half-frog, and the president of Intra-Venus, Inc. in the 82nd century.  A ruthless businessman, Dogbolter has on multiple occasions tried to capture the Doctor and his TARDIS, including hiring Frobisher  and Death's Head.
The Doctor rarely travels alone, preferring to share his adventures with the company of others. In his long life, he has travelled with many humans, fellow Time Lords, robots and other aliens. These include, but are not limited to, the following:
- Susan Foreman  (his granddaughter and first companion)
- Ian Chesterton and Barbara Wright 
- Vicki Pallister 
- Steven Taylor 
- Ben Jackson 
- Polly Wright 
- Sarah Jane Smith  
- Harry Sullivan 
- Leela 
- K9 
- Romana  
- Sharon Davies  
- Maxwell Edison 
- Adric 
- Nyssa 
- Tegan Jovanka   
- Gus Goodman  
- Vislor Turlough 
- Peri Brown 
- Mel Bush 
- Frobisher 
- Sarah Jane Smith 
- Ace   
- Bernice Summerfield   
Type 40 TARDIS. Short for Time And Relative Dimension In Space,, though "Dimensions" is sometimes used,  TARDIS refers to several models of space-time vessels, capable of travelling to any place or time (although the term "TARDIS" has also been identified a nickname Susan came up with specifically for the Doctor's space-time ship). The interior is an extradimensional space that can be much larger than the exterior, usually with cabins, recreational areas, and a control room. It often has a chameleon circuit, which allows the user to change its outward appearance to blend in with the scenery (in keeping with the Time Lords' non-intervention policy). The Doctor's TARDIS, for instance, took on the appearance of a London police call box when he visited Earth in the 1960s, but when the chameleon circuit malfunctioned, it remained in that shape permanently, only ever changing slightly or temporarily. The TARDIS is an "alive", sentient, machine-like lifeform capable of expressing emotion.  It holds stated affection for the Doctor. The source of its power is the 'Heart of the TARDIS', connected to the Time Vortex.
- Although the title of both the TV series and one of the Marvel comic series is Doctor Who, the lead character is rarely known as anything but "The Doctor." His real name is a closely guarded secret, that is generally left mysterious, though a few attempts have been made to reveal it. The phrase "Doctor Who?" has been described as a universe-ending question. 
- Marvel Comics first obtained the comic strip/book rights to the Doctor in 1979. Prior to this, several British publishers held the rights for a series of comic strips that ran from 1964 to 1979. There was also a separate comic strip devoted to the Daleks that was published for several years in the late 1960s before merging with the main Doctor Who strip. Marvel primarily published original adventures as a serialized strip in Doctor Who Weekly, later renamed Doctor Who Monthly and Doctor Who Magazine. This strip was later reprinted for North American distribution in several issues of Marvel Premiere and again in a monthly Doctor Who title that ran for several years in the early 1980s. The only non-DWM-related comic material published by Marvel was a one-off miniseries titled The Age of Chaos (written by Sixth Doctor actor Colin Baker), and it also reprinted excerpts from the 1964-1979 comic strip era in DWM and a spin-off magazine titled Doctor Who Classic Comics.
- Marvel Comics ceased to hold the license for the Doctor's comic book adventures in 1999, and consequently some information on the Doctor (specifically, anything relating to Doctors introduced from 2005 onwards) can not be added to this page as it was not revealed until after he ceased to be a Marvel character, and thus may not necessarily be relevant to the Doctor of Marvel's Earth-5556. The image on this main page depicts the Eighth Doctor, the last to appear in titles carrying the Marvel UK banner on the cover. Marvel, in one form or another, depicted the adventures of the first eight Doctors in the Doctor Who Weekly/Doctor Who Monthly/Doctor Who Magazine comic strip. The comic strip established by Marvel in October 1979 continues to be published as of 2020 by current license holder Panini, who published on behalf of Marvel between 1996 and 1999. A separate North American-based comic book line was established by IDW Publishing between 2007 and 2013, with Titan Comics taking over this range as of 2014.
- The Doctor first appeared on the BBC Television (later known as BBC1) TV series Doctor Who. His first televised appearance was in the four-part 1963 serial An Unearthly Child in November and December 1963; the original version of Doctor Who ran until December 1989, and the Doctor appeared in all except one of the original series' serials, and all but a handful of the series' episodes. Afterwards, the Doctor appeared in the American made-for-TV film on Fox Doctor Who in May 1996, and then the series was revived in March 2005 for BBC1 (by then called BBC One), still featuring the same character, and continues to air as of 2018; it marked its 50th anniversary in November 2013. All three productions are considered part of the same continuity. Two motion pictures starring Peter Cushing as "Dr. Who" were produced in the 1960s; these were remakes of TV stories and don't exactly fit into the "continuity" of most licensed Doctor Who stories, though some spin-off media have attempted to reconcile their existence and the current production team of the TV series confirmed that the 50th anniversary special at one point was to have established that they exist as movies in the "Whoniverse."
- So far, dozens of different actors have played the Doctor on an ongoing basis in Doctor Who, with far too many too ist here entirely. Only the first Eight have any connection to Marvel.
- William Hartnell (1963-66);
- Patrick Troughton (1966-69);
- Jon Pertwee (1970-74);
- Tom Baker (1974-81);
- Peter Davison (1981-84);
- Colin Baker (1984-86 and a 2003 animated serial);
- Sylvester McCoy (1987-89, the 1996 TV movie, and a 2003 animated serial);
- Paul McGann (1996 TV movie, 2003 animated serial, and later audio adventures);
- John Hurt (retroactive intermediate Time War Doctor)
- Christopher Eccleston (2005);
- David Tennant (2005-2010);
- Matt Smith (2010-13);
- Peter Capaldi (2013-17)
- Jodie Whittaker (2018-)
- Jo Martin (2020, unknown incarnation)
- Ncuti Gatwa (2023-, forthcoming)
- Additionally, Peter Cushing played a reimagined version of the character, Dr. Who, in two 1960s-era films (one of which, Dr. Who and the Daleks, was adapted as a comic book by Dell Comics).
- Interestingly enough, the ninth Doctor, Christopher Eccleston, would portray Malekith in Thor: The Dark World, while the tenth , David Tennant, would later go on to portray Purple Man in Marvel's Jessica Jones.
- Several characters from the Marvel-era comic strips have since been featured in officially licensed Doctor Who audio dramas by Big Finish Productions, most notably Izzy Sinclair, Frobisher, and Maxwell Edison.
- Two spin-off TV series have been produced by the BBC: Torchwood and The Sarah Jane Adventures; as well as the non-BBC spin-offs K9 and PROBE. No spin-offs have as yet been adapted as full-length comic books by Marvel, although Torchwood was adapted as a comic strip by Titan Publishing for Torchwood Magazine, which later was reprinted by Titan in a monthly comic title for North American distribution; the two publications were discontinued in 2011.
- The Doctor's exact age is unclear. In the 1963-89 TV series his stated age ranged from 450 in the serial The Tomb of the Cybermen (September 1967) to 953 in the serial Time and the Rani (September 1987). In the 2005-present revival, various episodes (such as "Aliens of London" from April 2005) reset the Ninth Doctor's age to 900 for reasons unknown, and as of the episode "The Time of the Doctor" (December 2013), he is now estimated to be at least 1,500 years of age. In the novels, however,  the Doctor was already well past his 1,000th year by the end of the Eighth Doctor era. Current showrunner Steven Moffat has stated that the Doctor simply doesn't know his age any more and that he lies about it constantly which accounts for the wildly different and contradicting ages he's given throughout the years. The 2014 season has the Twelfth Doctor claiming that he is now more than 2,000 years old. Some sources now state that the Doctor has lost track of their age.
- Before the current TV series, the Doctor became involved in the Last Great Time War, in which he was apparently responsible for the destruction of both his own race and the Dalek race. He has "regenerated" thirteen times so far; a process in which a Time Lord can change his physical appearance and cheat death (though in the episode "Journey's End", the Tenth Doctor was able to heal his injuries without changing his appearance). Time Lords can normally only regenerate a maximum of 12 times; however, it's possible for the Time Lords to grant one of their number a new regenerative cycle. This happened to the Doctor in the TV episode "The Time of the Doctor", which aired in December 2013, and allowed him the ability to regenerate for the thirteenth time (although this body is nominally referred to as the "Twelfth Doctor" by official sources, not the Fourteenth) when the Time Lords were able to contact the Eleventh Doctor from a pocket universe the Doctor safely placed them in on the final day of the Time War in the episode "The Day of the Doctor".
- Sydney Newman, one of the show's creators, previously created spy series The Avengers for the BBC's rival network ITV, a show with a cultural impact so great it caused Marvel's The Avengers to be renamed Avengers Assemble for UK release (however, any comics featuring characters from the TV series that are published in the US must use alternate titles, such as Steed and Mrs. Peel, due to Marvel's rights to the Avengers title stateside).
- About Time, volumes 1-8, by Lawrence Miles, Tat Wood and Dorothy Ail, Mad Norwegian Press
- The Comic Strip Companion 1964-79 by Paul Scoones
- The Doctor was exiled at least once.
- 97 episodes of the TV series are missing from the BBC archives, existing only in the form of soundtracks and sometimes short clips. This is due to the BBC's policy in the 1960s and 70s of wiping video tape for re-use. Many episodes, however, have been recovered over the years and concerted efforts are ongoing to recover the rest. Audio recordings exist of all lost episodes due to fans and this has allowed many lost episodes to be recreated using animation and the original soundtracks.
- 312 appearance(s) of The Doctor (Earth-5556)
- 9 mention(s) of The Doctor (Earth-5556)
- 264 image(s) of The Doctor (Earth-5556)
- 23 quotation(s) by or about The Doctor (Earth-5556)
Links and References
- The Doctor's Chronology (in Marvel publications)
- Doctor Who Reference Guide
- Doctor Who Wiki
- The Doctor on Tardis Wiki