Broadcast: Saturday 25th April 2015
5:00pm-6:00pm EDT (21:00 GMT) < > « »
CTV Sci-Fi Channel (adverts during broadcast)

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, it’s not just the crew but the whole of humanity at stake!
Synopsis Source: SPACE episode listing