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.
Katsuhiko Sasaki | Inventor Goro Ibuki |
Hiroyuki Kawase | Rokuro 'Roku-chan' Ibuki |
Yutaka Hayashi | Hiroshi Jinkawa |
Robert Dunham | Emperor Antonio of Seatopia |
Kotaro Tomita | Lead Seatopian Agent |
Ulf Otsuki | Seatopian Agent |
Gentaro Nakajima | Truck Driver |
Sakyo Mikami | Truck Driver's Assistant |
Fumiyo Ikeda | Man from Unit 1 |
Kanta Mori | Japan Special Defense Forces Chief |
Rolf Jessup | Antonios Aide (Radio Operator in White) |
Eisuke Nakanishi | Narrator |