Katy Manning

A full scale riot takes place at the Prison and Jo is taken hostage. Meanwhile, at the World Peace conference, the Chinese delegate’s aid prepares to kill the American delegate.

Sir Reginald Styles, a diplomat with the best chance of averting a war between Russia and China, is almost killed by a mysterious guerrilla.The fighter then disappears with Jo and the Doctor - into a terrifying future Earth ruled by Daleks.

The Master is behind the Keller Machine and uses it to recruit the rioting inmates at Stangmoor Prison. He plans to capture a missile and fire it at the World Peace Conference.

The mind parasite within the Keller Machine becomes too powerful for the Master to control. It learns how to move of its own accord and goes on the hunt for new minds.

The Keller Machine breaks free of the Doctor’s restraining device and the Doctor has no choice but to turn the parasite against the Master.

A captive of the guerrillas, the Doctor discovers they intend to change history. Jo is transported to the 22nd Century where she unwittingly gives vital information to the Daleks.