Gallifrey. The Doctor's home planet. For twenty, thousand centuries the Gallifreyans have been the most powerful race in the cosmos. They have circumnavigated infinity. and eternity, harnessed science, conquered death. They are the Lords of Time, and they have used their powers carefully.

But now a new force has been unleashed, one that is literally capable of anything. It is enough to give the Time Lords nightmares. More than that: it is enough to destroy them.