The Doctor has been summoned by old friend Winston Churchill, but in the Cabinet War Rooms far below the streets of blitz-torn London, it's his oldest enemy he finds waiting for him, as the time-travelling adventures continue. The Daleks are back – but can Winston Churchill be in league with them?

The Doctor's friends unite to send him a terrible warning; the Pandorica - which is said to contain the most feared being in all the cosmos - is opening. But what's inside, and can the Doctor stop it?