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.

Dr. Yuzo Mamiya

Akemi Togawa

Dr. Paul Stewart

General Hashimoto

Singer

Officer Hirai

Professor Kita

Chief Izumida

Lt. Col. Kazama

Saburo Kameda

General's Aide

Soldier

Defiant Reporter

Skeptical Reporter

Fisherman #1

Dr. Paul Stewart (voice)

Gaira
July 31, 1966

Dr. Yuzo Mamiya

Akemi Togawa

Dr. Paul Stewart

General Hashimoto

Singer

Officer Hirai

Professor Kita

Chief Izumida

Lt. Col. Kazama

Saburo Kameda

General's Aide

Soldier

Defiant Reporter

Skeptical Reporter

Fisherman #1

Dr. Paul Stewart (voice)

Gaira
