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
The Doctor (12)
David Bradley
The Doctor (1)
Mark Gatiss
The Captain
Pearl Mackie
Bill Potts
Nikki Amuka-Bird
The Glass Woman
Toby Whithouse
German Soldier
Lily Travers
Polly
Jared Garfield
Ben
