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 and the Daleks in the Seven Keys to Doomsday Doctor Who and the Daleks in the Seven Keys to Doomsday Doctor Who and the Daleks in the Seven Keys to Doomsday was a stage play based on the long-running British science fiction television series "Doctor Who". The play ran at the Adelphi Theatre in London, England for four weeks, beginning on 16 December 1974. Originally, the part of the Doctor was to be played by Jon Pertwee, but the role went instead to character actor Trevor Martin. Martin had previously appeared in "Doctor Who" as a Time Lord in the 1969 serial, "The War Games". In the play, it