 Flash, Dale, Zarkhov and, stowaway reporter, Happy Hapgood travel to Mars to find the source of a ray that is stealing the nitron from the Earth s atmosphere. They soon find out that it is Emperor Ming, with the help of Queen Azura of Mars who is behind this. With the aid of the Clay People and Prince Barin, Flash and his friends are triumphant in destroying the ray and putting an end to the scheme of Ming the Merciless.