The Doctor (Doctor Who) Time Lords a fixed number of twelve regenerations, meaning that every Time Lord had a total of thirteen incarnations including the original. The plot of "The Time of the Doctor" involves the Doctor receiving a new cycle of regenerations from the Time Lords before his expected demise, triggering the regeneration into the Twelfth Doctor, played by Peter Capaldi. The origins of the programme were explored in the docudrama "An Adventure in Space and Time" as part of the 50th anniversary celebrations of "Doctor Who", which starred David Bradley as William Hartnell. Although Time Lords resemble humans, their physiology differs in
The End of Time (Doctor Who) The End of Time (Doctor Who) The End of Time is a two-part story made up of the fourth and fifth of five special episodes of the British science fiction television series "Doctor Who" broadcast between December 2008 and January 2010. "The End of Time" was originally broadcast in the United Kingdom on BBC One on 25 December 2009 and 1 January 2010, and is the fifth "Doctor Who" Christmas special. This is the last story for lead actor David Tennant, who handed over the role of alien time traveller the Doctor to Matt Smith. It is also the last