To save the planet Earth from complete destruction, Flash Gordon, Dale Arden and Dr. Hans Zarkov fly into outer space where they crashland on the strange and mysterious planet of Mongo. As the three are taken prisoner by the Gillmen they meet other captives: Prince Barin of Arboria and Thun the Lion Man. Escaping their captors Flash and his friends find themselves hunted by the cruel Princess Aura and her women warriors across dangerous swamps. The heroes soon come face-to-face with the evil Ming the Merciless...