Doctor Who (2005) (2005)

Episode Overview

The Doctor and Clara arrive aboard a stricken Russian submarine in 1983, which is plunging uncontrollably into the depths of the ocean. An extraterrestrial being has broken free from a block of ice, wreaking havoc on the vessel. As tensions rise among the crew and with nuclear weapons on board, the stakes are higher than ever—it's not just the crew's lives at risk, but the future of humanity itself hangs in the balance!