Broadcast: Sunday 27th October 2013
8:00pm-9:00pm CST (02:00 GMT) < > « »
BBC Entertainment (Latin America)

Featuring: Matt Smith, Jenna-Louise Coleman, Liam Cunningham, Tobias Menzies, David Warner

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...