This silly British-made space opera finds distant ancestors of the lost civilization of Atlantis -- all of them nubile young ladies, of course, and starved for male company -- residing for some unexplained reason on the thirteenth moon of Jupiter, where they are discovered by an Earth exploration team headed by Anthony Dexter. The Earthmen offer to help the Atlantean cuties return home and re-establish their fallen city, but only manage to rescue one of them after they come under attack from a cheesy monster known as the "Black God." The film's camp highlight comes when the maidens perform an interpretive dance to the music of Borodin.