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.
Unfortunately the movie Godzilla vs. Megalon is not yet available on HBO Max.
| Directing | Jun Fukuda | Director |
| Production | Tomoyuki Tanaka | Producer |
| Camera | Yuzuru Aizawa | Director of Photography |
| Editing | Michiko Ikeda | Editor |
| Sound | Riichirō Manabe | Original Music Composer |
| Art | Yoshifumi Honda | Production Design |
| Writing | Jun Fukuda | Screenplay |
| Sound | Eishiro Hayashi | Sound Recordist |
| Lighting | Masakuni Morimoto | Lighting Technician |
| Writing | Shinichi Sekizawa | Lyricist |
| Sound | Masato Shimon | Vocals |
| Production | Keisuke Shinoda | Production Manager |
| Crew | Teruyoshi Nakano | Special Effects |
| Visual Effects | Teruyoshi Nakano | Visual Effects Director |
| Crew | Toshiro Aoki | Visual Effects Art Director |
| Visual Effects | Takeshi Miyanishi | Visual Effects |
| Crew | Shoji Ogawa | Special Effects |
| Visual Effects | Kazunobu Sanpei | Visual Effects Compositor |
| Writing | Shinichi Sekizawa | Story |
| Writing | Takeshi Kimura | Original Story |
| Directing | Tsunesaburo Nishikawa | First Assistant Director |
| Directing | Eiichi Asada | Assistant Director |
| Crew | Tadaaki Watanabe | Special Effects |
| Costume & Make-Up | Nobuyuki Yasumaru | Costume Design |
| Visual Effects | Nobuyuki Yasumaru | Modeling |
| Costume & Make-Up | Tomoki Kobayashi | Assistant Costume Designer |
| Costume & Make-Up | Tomoki Kobayashi | Costume Design |
| Visual Effects | Tomoki Kobayashi | Modeling |
| Visual Effects | Motoyoshi Tomioka | VFX Director of Photography |
| Crew | Motoyoshi Tomioka | Special Effects |
| Visual Effects | Kazunobu Sanpei | Visual Effects |
| Visual Effects | Teruyoshi Nakano | Visual Effects |
