Cold War
Series 7 Episode 8
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!
Trivia
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Series 7: Part 2 DVD & Blu-ray
Doctor Who - Series 7: Part 2

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