Doctor Who is a British science fiction television series produced by the BBC since 1963. It follows the adventures of the Doctor, a mysterious extraterrestrial Time Lord from the planet Gallifrey who travels through time and space in the TARDIS, a time machine disguised as a British police box

. The Doctor is a centuries-old alien who can regenerate into a new form when near death, allowing different actors to portray the character over time. As of 2025, there have been fifteen official incarnations of the Doctor, with Ncuti Gatwa currently playing the Fifteenth Doctor. Notably, the series has featured the first female Doctor, Jodie Whittaker, and the first black actor to headline the role, Ncuti Gatwa

. The show combines adventure, drama, and social themes, often featuring the Doctor combating injustice and saving civilizations. The Doctor usually travels with companions who play significant roles in the narrative. The series has had a continuous legacy, with a classic run from 1963 to 1989, a TV movie in 1996, and a revived series starting in 2005 that continues to the present day

. Doctor Who is available for viewing on platforms like Disney+ and has a strong fan community with spin-offs such as Torchwood and The Sarah Jane Adventures