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.
Genres:
Kenji Sahara as Dr. Yuzo Mamiya
Kumi Mizuno as Akemi Togawa
Russ Tamblyn as Dr. Paul Stewart
Jun Tazaki as General Hashimoto
Kipp Hamilton as Singer
Yoshifumi Tajima as Officer Hirai
Nobuo Nakamura as Professor Kita
Hisaya Ito as Chief Izumida
Nadao Kirino as Lt. Col. Kazama
Ren Yamamoto as Saburo Kameda
Kōzō Nomura as General's Aide
Shōichi Hirose as Soldier
Tadashi Okabe as Defiant Reporter
Hideo Shibuya as Skeptical Reporter
Ikio Sawamura as Fisherman #1
Seishirō Kuno as Fisherman #2
Someshō Matsumoto as Official
Gorō Mutsumi as Dr. Paul Stewart (voice)
Haruo Nakajima as Gaira
Yû Sekita as Sanda
Yasuhiro Komiya as Adolescent Sanda
Kasei Kinoshita as Adolescent Sanda (voice)
Yū Fujiki as (uncredited)
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