Robert Jewell

Looking for Barbara, the Doctor, Ian and Susan discover that they have exposed to lethal doses of radiation. The travellers are confronted by the city's inhabitants - the Daleks!

The Daleks have conquered the Earth. Susan and Barbara have joined the human resistance who launch an attack on the Dalek flying saucer where the Doctor and Ian are prisoners.

The Daleks follow the TARDIS to the jungle world of Mechanus, infested with lethal plants. There, the Daleks release a robot double of the Doctor that is programmed to kill.

Ian attempts to derail the Daleks' plan by sabotaging their bomb. The Doctor also works to undermine the Daleks by turning their Robomen slaves against them.