"One man, one destiny, twice."
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.
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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
Jenna Coleman
Clara Oswald
Matt Lucas
Nardole