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.
| Sound | Akira Ifukube | Original Music Composer |
| Production | Kenichiro Tsunoda | Executive Producer |
| Art | Takeo Kita | Production Design |
| Production | Tomoyuki Tanaka | Producer |
| Writing | Reuben Bercovitch | Story |
| Directing | Ishirō Honda | Director |
| Editing | Ryôhei Fujii | Editor |
| Production | Henry G. Saperstein | Producer |
| Production | Reuben Bercovitch | Executive Producer |
| Crew | Eiji Tsuburaya | Special Effects Manager |
| Art | Tôru Narita | Art Designer |
| Crew | Fumio Nakadai | Special Effects |
| Writing | Ishirō Honda | Writer |
| Production | Shoichi Koga | Production Manager |
| Production | Richard Krown | Production Supervisor |
| Writing | Takeshi Kimura | Writer |
| Crew | Teruyoshi Nakano | Special Effects Assistant |
| Crew | Yasuaki Sakamoto | Special Effects |
| Crew | Yasuyuki Inoue | Special Effects |
| Sound | Sadamasa Nishimoto | Sound Effects Editor |
| Crew | Hajime Koizumi | Cinematography |
| Visual Effects | Eiji Tsuburaya | Visual Effects |
| Sound | Norio Tone | Sound Recordist |
| Directing | Koji Kajita | First Assistant Director |
