A sexy female alien dressed in black leather lands her flying saucer in the remote Scottish moors, looking for men to repopulate her planet. She is armed with a raygun and accompanied by a menacing robot, and fond of zapping humans into oblivion just for the sheer fun of it.
The film is notable as the first science fiction film Gerry Anderson (Thunderbirds, UFO, Space 1999) edited, and as the film that inspired Octavia Butler to begin writing science fiction, although her reasons were not flattering with respect to the movie.