Katy Manning

At a crucial Peace Conference, Sir Reginald Styles, the diplomat with the best chance of averting a war between the Chinese and Russians is almost assassinated by a mysterious guerrilla.The fighter then disappears with Jo and the Doctor - into a terrifying future Earth ruled by the Daleks and their brutish slaves, the Ogrons.

The Doctor learns of a plot to change history and Jo is transported to the 22nd Century.

The TARDIS lands inside an Earth spaceship in the far future which is attacked by Ogrons.

The Daleks travel back in time to ensure that the peace conference fails.

The Doctor realises someone is provoking a war between Earth and Draconia.

In the underground city, the Doctor and the Master confront the guardian of the doomsday weapon. The miners make their last move to force the colonists to leave the planet.