Something is stirring in space, plunging entire galaxies into oblivion. But what? The Daleks and Cybermen are teaming up, the Silurians have overthrown humanity to establish a new empire, and old friends and enemies are joining forces as the universe faces its greatest threat yet. Only you, the Doctor's new companion, can prevent the end of the world and ward off the events foretold by a terrifying prophecy! Think you're up to the task?