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
Kyōko Enami
Yūzō Hayakawa
Takuya Fujioka
Kōji Fujiyama
Shō Natsuki
Yoshirō Kitahara
Ichirō Sugai
Bontarō Miake
Jutarō Hōjō
Kazuko Wakamatsu
Yuka Konno
Eiichi Takamura
Kenichi Tani
Kōichi Itō
Hikaru Hoshi
Osamu Abe
Jun Osanai
Yoshihiro Hamaguchi
Joe Ohara
Tsutomu Nakata
Yūji Moriya
Shinji Kawashima
Gai Harada
Kazuo Mori
Yasuo Araki
Shin Minatsu
Takehiko Gotō
Toichiro Kagawa
Nobuko Shingu
Hiroko Nishi
Michiyo Hikari
Teruo Aragaki