The British science fiction television series Doctor Who was first broadcast on BBC One. It introduced the concept of the Doctor, a Time Lord who travels through time and space in the TARDIS.
The Daleks, one of the Doctor's most iconic and enduring foes, appeared for the first time in the serial "The Daleks," establishing a key element of the series' legacy.
William Hartnell, the First Doctor, regenerated into Patrick Troughton as the Second Doctor, introducing the concept of regeneration which allowed the series to continue with different actors.
Doctor Who was successfully revived as a new series on BBC One, starring Christopher Eccleston as the Ninth Doctor, leading to a renewed and ongoing popularity.
Jodie Whittaker was introduced as the Thirteenth Doctor, marking the first time the Doctor was portrayed as a woman in the main television series.