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 in Australia episode ended on BBC One. Immediately afterwards, each episode became available on iView for one week, with an ABC2 encore broadcast at 8:30 the following (Monday) night. Later in the year, ABC1 took a live simulcast from the BBC to screen "Doctor Who Live: The Next Doctor", the half hour special in which the actor chosen to play the Twelfth Doctor was revealed before a live studio audience, on Monday 5 August at 4am. The special was replayed on ABC2 at 8:30pm on that same day. Purposefully timed as part of the ABC's recognition of "Doctor Who's" 50th Anniversary celebrations,