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
Doctor Who (2013 specials) omnibus edition of a serial of each Doctor. "Watch" is broadcasting two episodes per weekend, starting on 12 October. The British Film Institute ran a year long celebration of the 50th anniversary with monthly screenings of stories from each Doctor, culminating in November with screenings of both "The Day of the Doctor" and "An Adventure in Space and Time". BBC Radio 2 broadcast a number of new programmes commemorating the show, including a 90-minute documentary called "Who is the Doctor?"; "The Blagger's Guide to Doctor Who" hosted by David Quantick and Graham Norton's live Saturday show was broadcast from the