Gamera escapes from his rocket enclosure and makes his way back to Earth as a giant opal from New Guinea is brought back to Japan. The opal is discovered to have been an egg that births a new monster called Barugon. The creature attacks the city of Osaka by emitting a destructive rainbow ray from his back, along with a freezing spray capable of incapacitating Gamera.
Kōjirō Hongō
Keisuke Hirata
Kyōko Enami
Karen
Yūzō Hayakawa
Kawajiri
Takuya Fujioka
Dr. Sato
Kōji Fujiyama
Onodera
Shō Natsuki
Ichiro Hirata
Yoshirō Kitahara
Professor Amano
Ichirō Sugai
Dr. Matsushita
