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.
You can now watch The War of the Gargantuas online on the following streaming providers in the United States.
| Production | Henry G. Saperstein | Producer |
| Editing | Ryôhei Fujii | Editor |
| Sound | Akira Ifukube | Original Music Composer |
| Directing | Ishirō Honda | Director |
| Production | Kenichiro Tsunoda | Executive Producer |
| Art | Takeo Kita | Production Design |
| Production | Tomoyuki Tanaka | Producer |
| Writing | Reuben Bercovitch | Story |
| Production | Reuben Bercovitch | Executive Producer |
| Sound | Sadamasa Nishimoto | Sound Effects Editor |
| Directing | Kôji Kajita | Second Unit Director |
| Writing | Takeshi Kimura | Writer |
| Crew | Hajime Koizumi | Cinematography |
| Art | Tôru Narita | Art Designer |
| Writing | Ishirō Honda | Writer |
| Crew | Teruyoshi Nakano | Special Effects Assistant |
| Production | Richard Krown | Production Supervisor |
| Crew | Fumio Nakadai | Special Effects |
| Crew | Yasuyuki Inoue | Special Effects |
| Crew | Eiji Tsuburaya | Special Effects Manager |
| Production | Shoichi Koga | Production Manager |
| Crew | Yasuaki Sakamoto | Special Effects |
| Visual Effects | Eiji Tsuburaya | Visual Effects |
| Sound | Norio Tone | Sound Recordist |
