

31/07/1966
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.

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

Yoshibumi 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

Hiroshi Sekita
as Sanda

Yasuhiro Komiya
as Adolescent Sanda

Kasei Kinoshita
as Adolescent Sanda (voice)

Yū Fujiki
as (uncredited)
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