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.

• TOHO
• Benedict Pictures Corp.
• Russ Tamblyn
• Kumi Mizuno
• Kenji Sahara
• Nobuo Nakamura
• Jun Tazaki
• Hisaya Ito
• Yoshifumi Tajima
• Ren Yamamoto