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佐々木勝彦 as Inventor Goro Ibuki |
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林ゆたか as Hiroshi Jinkawa |
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Hiroyuki Kawase as Rokuro 'Roku-chan' Ibuki |
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森幹太 as Japan Special Defense Forces Chief |
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富田浩太郎 as Lead Seatopian Agent |
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大月ウルフ as Seatopian Agent |
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三上左京 as Truck Driver's Assistant |
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Fumiyo Ikeda as Man from Unit 1 |
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Robert Dunham as Emperor Antonio of Seatopia |
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Gentaro Nakajima as Truck Driver |
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Ralph Jesser as Antonio's Aide (Radio Operator in White) |
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Shinji Takagi as Godzilla |
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伊達 秀人 as Megalon |
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駒田 次利 as Jet Jaguar |
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Masachika Mori as Jet Jaguar |
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薩摩剣八郎 as Gigan (as Kengo Nakayama) |
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納谷悟朗 as Emperor Atonio of Seatopia (voice) |
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中西英介 as Narrator |
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中島春雄 as Godzilla (archive footage) (uncredited) |
| Directing | 福田純 | Director |
| Production | 田中友幸 | Producer |
| Camera | 逢沢譲 | Director of Photography |
| Editing | 池田美千子 | Editor |
| Sound | 眞鍋理一郎 | Original Music Composer |
| Art | Yoshifumi Honda | Production Design |
| Writing | 福田純 | Screenplay |
| Sound | Eishiro Hayashi | Sound Recordist |
| Lighting | Masakuni Morimoto | Lighting Technician |
| Writing | 関沢新一 | Lyricist |
| Sound | Masato Shimon | Vocals |
| Production | Keisuke Shinodo | Production Manager |
| Crew | 中野昭慶 | Special Effects |
| Visual Effects | 中野昭慶 | Visual Effects Director |
| Crew | 青木 利郎 | Visual Effects Art Director |
| Visual Effects | Takeshi Miyanishi | Visual Effects |
| Crew | Shoji Ogawa | Special Effects |
| Visual Effects | Kazunobu Sanpei | Visual Effects Compositor |
| Writing | 関沢新一 | Story |
| Writing | 木村 武 | Original Story |
| Directing | 西川 常三郎 | First Assistant Director |
| Directing | 浅田 英一 | Assistant Director |
| Crew | Tadaaki Watanabe | Special Effects |
| Costume & Make-Up | 安丸信行 | Costume Design |
| Visual Effects | 安丸信行 | Modeling |
| Costume & Make-Up | 小林知己 | Assistant Costume Designer |
| Costume & Make-Up | 小林知己 | Costume Design |
| Visual Effects | 小林知己 | Modeling |
| Visual Effects | 富岡 素敬 | VFX Director of Photography |
| Crew | 富岡 素敬 | Special Effects |
| Visual Effects | Kazunobu Sanpei | Visual Effects |
| Visual Effects | 中野昭慶 | Visual Effects |
| Production | Shizuo Nakajima | Production Assistant |
| Directing | Yoshio Tabuchi | Assistant Director |
