The War of the Gargantuas (1966)

The War of the Gargantuas
Action, Horror, Science Fiction
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.
Starring
Kenji Sahara, Kumi Mizuno, Russ Tamblyn, Jun Tazaki, Kipp Hamilton, Yoshibumi Tajima, Nobuo Nakamura, Hisaya Itō, Nadao Kirino, Ren Yamamoto
Directed By
Ishirō Honda