The Doctor and his companions arrive in a London very different from what they remember.
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 rebel attack on the Dalek flying saucer has been defeated. London is crawling with Daleks and Robomen, and the Doctor, Barbara and Susan must escape the city.
The Doctor, Barbara and Susan make their way out of London to the Dalek's mining operation in Bedfordshire whilst Ian faces the Black Daleks' pet Slyther.
Barbara realises how to control the Robomen and orders an attack on the Daleks.
