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 Time of the Doctor Collectors Boxset" alongside "The Name of the Doctor", "The Night of the Doctor", "The Day of the Doctor", "An Adventure in Space and Time" and "The Five(ish) Doctors Reboot". The ten Christmas specials between "The Christmas Invasion" and "Last Christmas" inclusive were released in a boxset titled "Doctor Who – The 10 Christmas Specials" on 19 October 2015. Selected pieces of score from "The Time of the Doctor", as composed by Murray Gold, were released on 24 November 2014 by Silva Screen Records. The Time of the Doctor "The Time of the Doctor" is an episode of the British science