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
The End of Time (Doctor Who) The End of Time (Doctor Who) The End of Time is a two-part story made up of the fourth and fifth of five special episodes of the British science fiction television series "Doctor Who" broadcast between December 2008 and January 2010. "The End of Time" was originally broadcast in the United Kingdom on BBC One on 25 December 2009 and 1 January 2010, and is the fifth "Doctor Who" Christmas special. This is the last story for lead actor David Tennant, who handed over the role of alien time traveller the Doctor to Matt Smith. It is also the last