The entire universe is in danger as the Daleks activate their masterplan, in the concluding episode of Russell T Davies's Bafta Award-winning time-travelling drama. The Doctor is helpless, and even the Tardis faces destruction. The only hope lies with the Doctor's secret army of companions – but as they join forces to battle Davros himself, the prophecy declares that one of them will die.

David Tennant plays the Doctor and Catherine Tate plays his companion, Donna Noble.