Doctor Who is a British science fiction television series produced by the BBC, first broadcast in 1963 and continuing in various forms to the present day
. The show follows the adventures of the Doctor, an extraterrestrial being from the humanoid species known as Time Lords, who travels through time and space in a time machine called the TARDIS, which looks like a blue British police box on the outside but is much larger inside
. The Doctor is a centuries-old rogue Time Lord from the planet Gallifrey who uses ingenuity and minimal resources, including a sonic screwdriver, to fight evil, save lives, and protect oppressed peoples across the universe
. The character has the unique ability to regenerate into a new form when mortally injured, allowing different actors to portray the Doctor while maintaining continuity of the character's memories and personality traits
. As of 2025, the current incarnation is the Fifteenth Doctor, played by Ncuti Gatwa, who is the first black actor to headline the role
. The Doctor often travels with companions, usually humans, and frequently encounters recurring enemies such as the Daleks, Cybermen, and the renegade Time Lord known as the Master
. The series combines elements of action, adventure, comedy, and drama, and is known for its imaginative storytelling and cultural impact, having become a landmark of British popular culture and science fiction television
. In summary, Doctor Who is a long-running, iconic sci-fi show centered on a time-traveling alien hero who combats evil across time and space, distinguished by its unique concept of regeneration and its enduring popularity worldwide
