Gaira, a humanoid sea beast spawned from the discarded cells of Frankenstein's monster, attacks the shores of Tokyo. While the Japanese military prepares to take action, Gaira's Gargantua brother, Sanda, descends from the mountains to defend his kin. A battle between good and evil ensues, leaving brothers divided and a city in ruins.
Unfortunately the movie The War of the Gargantuas is not yet available on HBO Max.
| Directing | Ishirō Honda | Director |
| Production | Henry G. Saperstein | Producer |
| Production | Tomoyuki Tanaka | Producer |
| Editing | Ryôhei Fujii | Editor |
| Writing | Reuben Bercovitch | Story |
| Production | Kenichiro Tsunoda | Executive Producer |
| Sound | Akira Ifukube | Original Music Composer |
| Art | Takeo Kita | Production Design |
| Production | Reuben Bercovitch | Executive Producer |
| Writing | Ishirō Honda | Writer |
| Writing | Takeshi Kimura | Writer |
| Crew | Hajime Koizumi | Cinematography |
| Production | Shoichi Koga | Production Manager |
| Production | Richard Krown | Production Supervisor |
| Art | Tôru Narita | Art Designer |
| Sound | Sadamasa Nishimoto | Sound Effects Editor |
| Crew | Yasuyuki Inoue | Special Effects |
| Crew | Fumio Nakadai | Special Effects |
| Crew | Teruyoshi Nakano | Special Effects Assistant |
| Crew | Yasuaki Sakamoto | Special Effects |
| Crew | Eiji Tsuburaya | Special Effects Manager |
| Visual Effects | Eiji Tsuburaya | Visual Effects |
| Sound | Norio Tone | Sound Recordist |
| Directing | Koji Kajita | First Assistant Director |
