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
David Bradley (director) David Bradley (director) David Shedd Bradley (6 April 1920 in Winnetka, Illinois – 19 December 1997 in Los Angeles, California) was an American motion picture director, actor, film collector, and university instructor. David Shedd Bradley was a grandson of Charles Banks Shedd, a prominent Chicago real estate investor, banker, and financier, and civic leader who also served as an executive officer of the Knickerbocker Ice Company of Chicago, which had been founded principally by Edward Avery Shedd, younger brother of Charles Banks Shedd. He attended the Todd School for Boys (from which Orson Welles had graduated in 1931) from 1935