A scientist comes to believe that evil is a disease of the blood and that the flesh of a skeleton he has brought back from New Guinea contains it in a pure form. Convinced that his wife, a Folies Bergere dancer who went insane, manifested this evil, he is terrified that it will be passed on to their daughter. He tries to use the skeleton's blood to immunise her against this eventuality, but his attempt has anything but the desired result.
Doctor Who and his companions are hurled into the future and make a horrifying discovery: the Daleks have conquered Earth! The metal fiends have devastated entire continents and turned the survivors into Robomen.
Evil lurks in the gloomy house at Markham Manor where a deranged Sir Edward is the chained prisoner of his brother Julian. When Sir Edward escapes, he embarks on a monstrous killing spree, determined to seek revenge on all those whom he feels have double-crossed him.
