The Doctor Falls the episode, the Doctor (Peter Capaldi) must save himself and the remaining human population of a gigantic colony ship from Mondas, while also dealing with two different incarnations of the Master (Michelle Gomez and John Simm) at once. The episode features a cameo from the First Doctor, now portrayed by David Bradley. He had previously played William Hartnell, the original First Doctor actor, in the 2013 "Doctor Who" docudrama "An Adventure in Space and Time". Aboard the colony ship reversing from the event horizon of a black hole, the Doctor finds Bill has been converted into a Cyberman. The Master
Doctor Who (2013 specials) Davies and John Barrowman, with David Tennant's wife Georgia Moffet and their children also guest starring. "The Day of the Doctor" formed the centerpiece of the celebrations, which encompassed programmes across all of the BBC's platforms, including "An Adventure in Space and Time", a "Culture Show" special entitled "Me, You and Doctor Who" presented by Matthew Sweet that explores the wider cultural significance of the show. CBBC broadcast a show called "12 Again" in which past and present stars of the show recounted their memories, Professor Brian Cox delivered a televised lecture on the science of "Doctor Who", and BBC