'Let me tell you a story. Long ago, in the frozen Arctic wastes, an alien army landed. Only now, 10,000 years later, it isn't a story. And the army is ready to attack.'New York - one of the greatest cities on 21st century Earth... But what's going on...
Alien larvae in a baptismal font mark the beginnings of a terrifying adventure for Captain Jack, Gwen, Ianto and Rhys....