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
Partners in Crime (Doctor Who) Partners in Crime (Doctor Who) "Partners in Crime" is the first episode of the fourth series of the British science fiction television series "Doctor Who". It was broadcast on BBC One on 5 April 2008. The episode reintroduced actor and comedian Catherine Tate as the temp Donna Noble, who had previously appeared in the 2006 Christmas Special "The Runaway Bride". In the episode, Donna and the alien time traveller the Tenth Doctor (David Tennant) meet while separately investigating Adipose Industries, a company that has created a revolutionary diet pill. Together, they attempt to stop the death of thousands of people