When a series of mysterious disintegration deaths occur in Pittsburgh, the team discovers that the artifact responsible, Joshua’s Horn, has ties to Helena’s time as an agent in 1893.

The Earth has been moved, and it’s a race against time as Donna and the Doctor try to find it before the Daleks destroy everything; they head for the Shadow…

The Earth has been overwhelmed and the universe faces dominion by the resurgent forces of a terrifying and limitless empire led by one of The Doctor’s greatest enemies. Aiding the…