The Time Lords send the Doctor, Sarah, and Harry to Skaro at a point in time shortly before the creation of the Daleks. The Doctor's mission is to destroy his greatest enemy.
The Doctor finds that some of Davros's fellow Kaleds are unhappy with the development of the Daleks. Sarah is forced to load a Thal war rocket with radioactive explosives.
The Doctor informs the Kaled government of Davros's experiments and they move to shut down the bunker. But Davros is one step ahead and prepares to take drastic action.
When the Kaled dome is destroyed by the Thals' rocket, the war appears to be over and the Thals rejoice at their victory. But then, the Daleks appear and a massacre begins.
With Harry and Sarah as his prisoners, Davros interrogates the Doctor, forcing him to reveal the future of the Daleks so that he can learn from their defeats to make them stronger.
The Kaled scientific elite move to prevent the development of the Daleks while the Doctor prepares to destroy them forever. But is it already too late?
