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
Space and Time (Doctor Who) Space and Time (Doctor Who) "Space" and "Time" are two mini-episodes of the British science fiction television series "Doctor Who". They were broadcast on 18 March 2011 as part of BBC One's Red Nose Day telethon for the charity Comic Relief. The two mini-episodes were written by the programme's head writer Steven Moffat and directed by Richard Senior. The episodes form a two-part story, set entirely within the TARDIS, starring Matt Smith as the Doctor, and Karen Gillan and Arthur Darvill as married couple Amy Pond and Rory Williams. Rory, helping the Doctor work on the TARDIS, looks up the