Nyah, a female Extraterrestrial life commander from Mars, dressed in shiny black vinyl, heads for London in her flying saucer. She is part of the advanced alien team that is looking for Earth men to replace the dying male population on her world. Because of damage to her saucer, caused by entering Earth's atmosphere and then colliding with an aircraft, she is forced to land her damaged flying saucer in the remote Scotland moorland, near a local village. She is armed with a raygun that can paralyze or kill, and she also has a tall, menacing robot named Chani.