Flash Gordon, Dale Arden and Dr. Alexis Zarkov visit the planet Mongo to thwart the evil schemes of Emperor Ming the Merciless, who has set his planet on a collision course with Earth.Flash Gordon, Dale Arden and Dr. Alexis Zarkov visit the planet Mongo to thwart the evil schemes of Emperor Ming the Merciless, who has set his planet on a collision course with Earth.Flash Gordon, Dale Arden and Dr. Alexis Zarkov visit the planet Mongo to thwart the evil schemes of Emperor Ming the Merciless, who has set his planet on a collision course with Earth.