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.