Summary
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.
Details
Release Date: July 31, 1966
Runtime: 88 minutes
Genres: Action, Horror, Science Fiction
Original Language: JA
Rating: ⭐ 6.4/10 (104 votes)
Frankenstein (Toho) Collection

Frankenstein Conquers the World
During WWII, Germans obtain the immortal heart of Frankenstein's monster and transport it to Japan to prevent it being seized by the Allies. Kept in a Hiroshima laboratory, it is seeming lost when the United States destroys the city with the atomic bomb. Years later a wild boy is discovered wandering the streets of the city alone, born of the immortal heart.

The War of the Gargantuas
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.
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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 Itō
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

Gorō Mutsumi
Dr. Paul Stewart (voice)

Haruo Nakajima
Gaira

Yū Fujiki
(uncredited)






