Doctor Who

Doctor Who is a British science fiction television series broadcast by the BBC since 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 he seeks 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 2023, the show has been co-produced by Bad Wolf and BBC Studios Productions in Cardiff. Doctor Who has spawned numerous spin-offs as part of the Whoniverse, including comic books, films, novels and audio dramas, and the television series K-9 and Company (1981), Torchwood (2006–2011), The Sarah Jane Adventures (2007–2011), K9 (2009–2010), Class (2016), Tales of the TARDIS (2023–2024), and The War Between the Land and the Sea (2025). It has been the subject of many parodies and references in popular culture.