As the Twelfth Doctor nears regeneration, he stumbles on his first incarnation, also refusing to change. It takes a captain, a glass avatar and a familiar face to convince the Doctors the universe still needs them.
Peter Capaldi
as The Doctor (12)
David Bradley
as The Doctor (1)
Mark Gatiss
as The Captain
Pearl Mackie
as Bill Potts
Nikki Amuka-Bird
as The Glass Woman
Toby Whithouse
as German Soldier
Lily Travers
as Polly
Jared Garfield
as Ben
Jenna Coleman
as Clara Oswald
Matt Lucas
as Nardole
Nicholas Briggs
as Daleks (voice)
Jodie Whittaker
as The Doctor (13)
