For some unknown reason, the men on Mars are dying. Worried that the Martian population will soon die out, the planet's leaders decide to send Nyah (Patricia Laffan) to Earth to bring back a fresh supply of healthy, virile men. After Nyah's ship crash-lands in Scotland, she seeks help at a village inn. She tries to convince the men, including a disbelieving scientist (Joseph Tomelty) and an ex-convict (Peter Reynolds), to come with her, but doesn't understand their wives' objections.

The grandson of Dr Frankenstein works as a lab assistant while secretly assembling a perfect being, with some help from the gardener and an accidental murder.