As the world descends into chaos as the final sanction begins, Gwen must stand alone.

As the Ambassador shows its intent, the Torchwood team discovers the truth of 1965.

As the 456 announce that they are here, the world focuses on Britain.

As the government makes plans for Floor 13, Torchwood must go underground.

There is a mysterious signal reaching out to large groups of helpless children. When the Torchwood team gets involved, they inadvertently place themselves in mortal danger.