Flash Gordon thought that his father died in a fire 13 years ago. Actually, Professor Gordon disappeared through a "rift", traveling to the planet Mongo... and now something has come back through the rift, looking for a mysterious artifact that Gordon left behind. Flash is forced to team up with his ex-girlfriend, Dale Arden, who travels with him to Mongo to meet Ming, the planet's brutal dictator. When they arrive, Ming imprisons Flash and sends Dale to his harem to be prepared for his pleasure. In the end, Flash and Dale escape back to Earth.