Dreaded Megalon from the undersea kingdom! A miraculous deathblow from the wound-ridden Godzilla!
6.2
82 min
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.
| Name | Character | Team | |
|---|---|---|---|
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Katsuhiko Sasaki | Inventor Goro Ibuki | Unowned |
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Yutaka Hayashi | Hiroshi Jinkawa | Unowned |
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Hiroyuki Kawase | Rokuro 'Roku-chan' Ibuki | Unowned |
| Kanta Mori | Japan Special Defense Forces Chief | Unowned | |
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Kotaro Tomita | Lead Seatopian Agent | Unowned |
| Ulf Otsuki | Seatopian Agent | Unowned | |
| Sakyo Mikami | Truck Driver's Assistant | Unowned | |
| Fumiyo Ikeda | Man from Unit 1 | Unowned | |
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Robert Dunham | Emperor Antonio of Seatopia | Unowned |
| Gentaro Nakajima | Truck Driver | Unowned | |
| Ralph Jesser | Antonio's Aide (Radio Operator in White) | Unowned | |
| Shinji Takagi | Godzilla | Unowned | |
| Hideto Odachi | Megalon | Unowned | |
| Tsugutoshi Komada | Jet Jaguar | Unowned | |
| Masachika Mori | Jet Jaguar | Unowned | |
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Kenpachirō Satsuma | Gigan (as Kengo Nakayama) | Unowned |
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Gorō Naya | Emperor Atonio of Seatopia (voice) | Unowned |
| Eisuke Nakanishi | Narrator | Unowned | |
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Haruo Nakajima | Godzilla (archive footage) (uncredited) | Unowned |