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.

Top Cast

Peter CapaldiThe Doctor (12)

David BradleyThe Doctor (1)

Mark GatissThe Captain

Pearl MackieBill Potts

Nikki Amuka-BirdThe Glass Woman

Toby WhithouseGerman Soldier

Lily TraversPolly

Jared GarfieldBen