Doctor Who is a British science fiction television series first broadcast by the BBC in 1963. The series, created by Sydney Newman, C. E. Webber and Donald Wilson, follows the adventures of the Doctor, an extraterrestrial being from a humanoid species known as Time Lords. The Doctor travels through space and time using a time travelling spaceship called the TARDIS, which has an exterior that resembles a British police box. The Doctor encounters various civilisations, which they seek to protect by outwitting foes and solving crises. The Doctor usually travels with a companion.
Beginning with William Hartnell, fourteen actors have headlined the series as the Doctor; the most recent being Ncuti Gatwa, who portrayed the Fifteenth Doctor from 2023 to 2025. The transition between actors is woven into the story via the plot device of regeneration. When a Time Lord is fatally injured or weakened by old age, their cells regenerate into a new body; while they retain their memories, their personality changes. The different portrayals function as distinct stages within a single, continuous narrative. Due to time travel, these different incarnations occasionally cross paths.
A British popular culture staple with a global cult following, the show has shaped generations of British television professionals. Fans of the series are sometimes referred to as Whovians. The series has been listed in Guinness World Records as the longest-running science-fiction television series in the world, as well as the "most successful" science-fiction series of all time, based on its overall broadcast ratings, DVD and book sales.
The series originally ran from 1963 to 1989. There was an unsuccessful attempt to revive regular production in 1996 with a backdoor pilot in the form of a television film titled Doctor Who. The series was relaunched in 2005, with production moving to BBC Wales in Cardiff. Since 2016, the show has been produced or co-produced by BBC Studios Productions in Cardiff. Since 2026, the series has been pending an invitation to tender for future episodes. The Doctor Who franchise, or Whoniverse, spans a wide range of media, including television spin-offs, literature, audio dramas, and films. As a global cultural phenomenon, it has become one of the most frequently referenced and parodied series in television history.
Doctor Who follows the adventures of the title character, a rogue Time Lord who goes by the name "the Doctor". The Doctor fled Gallifrey, the planet of the Time Lords, in a stolen TARDIS ("Time and Relative Dimension(s) in Space"), a time machine that travels by materialising into, and dematerialising out of, the time vortex. The TARDIS has a vast interior but appears smaller on the outside, and is equipped with a "chameleon circuit" intended to make the machine take on the appearance of local objects as a disguise. Because of a malfunction, the Doctor's TARDIS remains fixed as a blue British police box.
Across time and space, the Doctor, using only ingenuity and minimal resources, such as the versatile sonic screwdriver, is drawn into crises in which they oppose dangerous adversaries, seeking to protect civilisations, while also navigating situations that present complex moral decisions. The Doctor rarely travels alone and is often joined by one or more companions on these adventures; these companions are usually humans, owing to the Doctor's fascination with planet Earth, which also leads to frequent collaborations with the international military task force UNIT when Earth is threatened. The Doctor is centuries old and, as a Time Lord, can regenerate when there is mortal damage to their body or when their body is weakened from old age. The Doctor's various incarnations have gained numerous recurring enemies during their travels, including the Daleks, their creator Davros, the Cybermen, and the renegade Time Lord the Master.
Doctor Who was originally intended to appeal to a family audience as an educational programme using time travel as a means to explore scientific ideas and famous moments in history. The programme first appeared on the BBC Television Service at 17:16:20 GMT on 23 November 1963; this was eighty seconds later than the scheduled programme time, because of announcements concerning the previous day's assassination of John F. Kennedy. It was to be a regular weekly programme, each episode 25 minutes of transmission length. Discussions and plans for the programme had been in progress for a year. Sydney Newman, the head of drama, was mainly responsible for developing the programme, with the first format document for the series being written by Newman along with the head of the script department (later head of serials) Donald Wilson and staff writer C. E. Webber; in a 1971 interview, Wilson claimed to have named the series, and when this claim was put to Newman, he did not dispute it. Writer Anthony Coburn, story editor David Whitaker and initial producer Verity Lambert also heavily contributed to the development of the series.
On 31 July 1963, Whitaker commissioned Terry Nation to write a story under the title The Mutants. As originally written, the Daleks and Thals were the victims of an alien neutron bomb attack, but Nation later dropped the aliens and made the Daleks the aggressors. When the script was presented to Wilson, it was immediately rejected as the programme was not permitted to contain any "bug-eyed monsters". According to Lambert, "We didn't have a lot of choice—we only had the Dalek serial to go ... We had a bit of a crisis of confidence because Donald [Wilson] was so adamant that we shouldn't make it. Had we had anything else ready we would have made that." Nation's script became the second Doctor Who serial – The Daleks (also known as The Mutants). The serial introduced the eponymous aliens that would become the series' most popular monsters, dubbed "Dalekmania", and was responsible for the BBC's first merchandising boom.
The BBC drama department produced the programme for 26 seasons, broadcast on BBC One. Due to his increasingly poor health, William Hartnell, the first actor to play the Doctor, was succeeded by Patrick Troughton in 1966. In 1970, Jon Pertwee replaced Troughton and the series began production in colour. In 1974, Tom Baker was cast as the Doctor. His eccentric personality became hugely popular, with viewing figures for the series returning to a level not seen since the height of "Dalekmania" a decade earlier. After seven years in the role, Baker was replaced by Peter Davison in 1981, and Colin Baker replaced Davison in 1984. In 1985, the channel's controller Michael Grade cancelled the upcoming twenty-third season, forcing the series into an eighteen-month hiatus. In 1986, the series was recommissioned on the condition that Baker left the role of the Doctor, which was recast to Sylvester McCoy in 1987. Falling viewing numbers, a decline in the public perception of the series and a less-prominent transmission slot saw production ended in 1989 by Peter Cregeen, the BBC's new head of series. Although it was effectively cancelled, the BBC repeatedly affirmed over several years that the series would return.
While in-house production concluded, the BBC explored an independent production company to relaunch the series. Philip Segal, a British expatriate who worked for Columbia Pictures' television arm in the United States, had approached the BBC as early as July 1989, while the 26th season was still in production. Segal's negotiations eventually led to a Doctor Who television film as a pilot for an American series, broadcast on the Fox Network in 1996, as an international co-production between Fox, Universal Pictures, the BBC and BBC Worldwide. Starring Paul McGann as the Doctor, the film was successful in the UK (with more than 9 million viewers), but was less so in the United States and did not lead to a series.
Licensed media such as novels and audio plays provided new stories, but as a television programme, Doctor Who remained dormant. In September 2003, BBC Television announced the in-house production of a new series, after several years of attempts by BBC Worldwide to find backing for a feature film version. The 2005 revival of Doctor Who is a direct plot continuation of the original 1963–1989 series and the 1996 television film Doctor Who. The executive producers of the new incarnation of the series were Queer as Folk writer Russell T Davies and BBC Cymru Wales head of drama Julie Gardner. From 2005, the series switched from a multi-camera to a single-camera setup.