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"It's an Ice Warrior. A native of the planet Mars. And we go way back. Way back."
The Doctor and Clara land on a damaged Russian Submarine in 1983 as it spirals out of control into the ocean depths. An alien creature is loose on board, having escaped from a block of Arctic ice. With tempers flaring and a cargo of nuclear weapons on board, it's not just the crew but the whole of humanity at stake!
The Doctor: Matt Smith
Clara: Jenna Coleman
Captain Zhukov: Liam Cunningham
Professor Grisenko: David Warner
Lieutenant Stepashin: Tobias Menzies
Piotr: Josh O'Connor
Onegin: James Norton
Belevich: Charlie Anson
Skaldak: Spencer Wilding
Director: Douglas Mackinnon
Writer: Mark Gatiss
Producer: Marcus Wilson