Torchwood is defenceless and Gwen Cooper stands alone as the final sanction begins. As violence erupts and the world descends into anarchy, an ordinary council estate becomes a battleground where the future of the human race will be decided.

Torchwood finally learns the truth about the events of 1965. Britain is in danger of becoming a rogue state, and everything now pivots around John Frobisher, as the ambassador of the 456 destroys its old allegiances and reveals its true intent.

The eyes of the world turn to Britain, as the 456 announce, 'We are here'. As a pillar of fire descends upon London, the members of Torchwood must battle to protect their own families, as the fight gets personal. But will Clem's memories destroy everything?

Torchwood are forced underground, as the government takes swift and brutal action. With members of the team being hunted down, only Lois holds the key to Torchwood's salvation - but she is helpless as her superiors make plans for the mysterious Floor 13.

An ordinary day becomes a world of terror as every single child in the world stops. A message is sent to the governments of Earth: 'We are coming'. As a trap closes around Captain Jack, sins of the past return, as long-forgotten events from 1965 threaten to reveal an awful truth.