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: The Early Adventures portrayed the role of original Barbara actress Jacqueline Hill in the 2013 drama "An Adventure in Space and Time", and Dan Starkey as the Sontarans. The second story also features actor James Joyce in the role of a new companion, Jospa. <section begin=series3 /><section end=series3 /> Frazer Hines, Anneke Wills, Elliot Chapman and Wendy Padbury reprise their roles as the Doctor's companions, with Frazer Hines also playing the Second Doctor. Other characters are also played by Anjella Mackintosh, Wanda Opalinska, Kristina Buikaite, Alistair Petrie, Debbie Chazen, Matilda Ziegler, David Sibley, Kerry Gooderson, Ewan Bailey, Alan Blyton, Judith Roddy, Adam Newington,