
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.
Cast

Kenji Sahara
Dr. Yuzo Mamiya

Kumi Mizuno
Akemi Togawa

Russ Tamblyn
Dr. Paul Stewart

Jun Tazaki
General Hashimoto

Kipp Hamilton
Singer

Yoshibumi Tajima
Officer Hirai

Nobuo Nakamura
Professor Kita

Hisaya Ito
Chief Izumida

Nadao Kirino
Lt. Col. Kazama

Ren Yamamoto
Saburo Kameda

Kōzō Nomura
General's Aide

Shōichi Hirose
Soldier

Tadashi Okabe
Defiant Reporter

Hideo Shibuya
Skeptical Reporter

Ikio Sawamura
Fisherman #1
Seishirō Kuno
Fisherman #2
Someshō Matsumoto
Official

Gorō Mutsumi
Dr. Paul Stewart (voice)

Haruo Nakajima
Gaira
Hiroshi Sekita
Sanda
Yasuhiro Komiya
Adolescent Sanda
Kasei Kinoshita
Adolescent Sanda (voice)

Yū Fujiki
(uncredited)
Crew

Ishirō Honda
Director, Screenplay

Takeshi Kimura
Screenplay

Reuben Bercovitch
Story, Executive Producer
Ryôhei Fujii
Editor

Hajime Koizumi
Director of Photography

Koji Kajita
First Assistant Director

Seiji Tani
Assistant Director

Tomoyuki Tanaka
Executive Producer
Kenichiro Tsunoda
Executive Producer

Henry G. Saperstein
Executive Producer
Richard Krown
Production Supervisor
Takeo Kita
Production Design
Yoshiyuki Tokumasa
Visual Effects Camera, Visual Effects

Koichi Kawakita
Visual Effects Camera, Visual Effects Compositor, Visual Effects
Tokimaro Karasawa
Visual Effects Camera, Special Effects, Special Effects Assistant
Kenya Mukai
Visual Effects Camera, Special Effects, Special Effects Assistant
Takeshi Yamamoto
Visual Effects Camera, Special Effects, Special Effects Assistant
Takao Tsurumi
Visual Effects Camera, Special Effects, Special Effects Assistant

Takeshi Miyanishi
Visual Effects Camera, Special Effects, Special Effects Assistant
Mitsuru Toriumi
Visual Effects Camera, Special Effects, Special Effects Assistant

Teizô Toshimitsu
Costume Design, Modeling
Sadamasa Nishimoto
Sound Effects Editor
Norio Tone
Sound Recordist
Toshio Takashima
Lighting Technician

Kuichiro Kishida
Lighting Technician, VFX Lighting Artist

Eiji Tsuburaya
Special Effects, Visual Effects Director, Visual Effects

Teruyoshi Nakano
Special Effects, Special Effects Assistant, Visual Effects Director, Visual Effects

Sadamasa Arikawa
Special Effects, VFX Director of Photography

Motoyoshi Tomioka
Special Effects, VFX Director of Photography

Yôichi Manoda
Special Effects, VFX Director of Photography

Sadao Iizuka
Special Effects, Visual Effects
Kyuzo Yamamoto
Special Effects

Tadaaki Watanabe
Special Effects
Fumio Nakadai
Special Effects
Takeharu Ikebuchi
Special Effects Assistant, Visual Effects Art Director
Hiromasa Shirai
Special Effects Assistant, Visual Effects Art Director

Hiroshi Komura
Special Effects Assistant, Visual Effects Art Director

Jiro Shirasaki
Special Effects Assistant, Visual Effects Art Director
Yoshio Irie
Special Effects Assistant, Visual Effects Art Director

Toshiro Aoki
Special Effects Assistant, Visual Effects Art Director
Shun Suganuma
Special Effects Assistant, Visual Effects Art Director
Mutsumi Toyoshima
Special Effects Assistant, Visual Effects Art Director
Hiroshi Mukoyama
Visual Effects Compositor, Visual Effects
Yasuaki Sakamoto
Visual Effects Production Manager

Yasuyuki Inoue
Visual Effects Art Director

Akira Ifukube
Original Music Composer

Mary Shelley
Characters

Tohl Narita
Creature Design
Shoichi Koga
Production Manager

Kipp Hamilton
Vocals
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