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!
- Writer
- Mark Gatiss
- Director
- Douglas Mackinnon
- Cast
- Matt Smith, Karen Gillan, Jenna Coleman
- Guest Stars
- James Norton, Tobias Menzies, Liam Cunningham, David Warner, Josh O’Connor, Charlie Anson, Spencer Wilding, Nicholas Briggs

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