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Inventor Goro Ibuki creates a humanoid robot named Jet Jaguar. It is soon seized by an undersea race of people called the Seatopians. Using Jet Jaguar as a guide, the Seatopians send Megalon as vengeance for the nuclear tests that have devastated their society.
Director
Jun Fukuda
Japan Special Defense Forces Chief

Lead Seatopian Agent
Seatopian Agent
Truck Driver's Assistant
Man from Unit 1

Emperor Antonio of Seatopia
Truck Driver
Antonio's Aide (Radio Operator in White)
Godzilla