Trapped in a time corridor, the TARDIS veers off course, emerging in London's deserted docklands. In the far future, a prison ship in deep space comes under attack. These two remote events are linked by one terrible purpose. Davros, the ruthless creator of the Daleks, has been liberated after 90 years of imprisonment to assist in the resurrection of his Dalek army. He's their best hope for finding the antidote to the deadly anti-Dalek virus devised by their longtime robotic rivals, the Movellans. Davros sets about his appointed task with a secret agenda of his own - one that may force the Doctor to descend to Davros's level of evil.