Funko Doctor Who POP! Television K-9 Vinyl Figure

Doctor Who is a British science-fiction television program broadcast by the BBC since 1963. The program depicts the adventures of a Time Lord called the Doctor, an extraterrestrial being who appears to be human. The Doctor explores the universe in a time-travelling space ship called the TARDIS. The TARDIS exterior appears as a blue British police box, which was a common sight in Britain in 1963 when the series first aired. With various companions, the Doctor combats foes, works to save civilizations, and helps people in need.

Beginning with William Hartnell, thirteen actors have headlined the series as the Doctor; in 2017, Jodie Whittaker became the first woman to officially play the role on television. The transition from one actor to another is written into the plot of the show with the concept of regeneration into a new incarnation, a plot device in which a Time Lord "transforms" into a new body when the current one is too badly harmed to heal normally. Each actor's portrayal is unique, but all represent stages in the life of the same character, and together, they form a single lifetime with a single narrative. The time-travelling feature of the plot means that different incarnations of the Doctor occasionally meet.

The show is a significant part of British popular culture, and elsewhere, it has gained a cult following. It has influenced generations of British television professionals, many of whom grew up watching the series. Fans of the series are sometimes referred to as Whovians. The program is listed in Guinness World Records as the longest-running science-fiction television show 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, and iTunes traffic.