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.
本郷功次郎
as Keisuke Hirata
江波杏子
as Karen
早川雄三
as Kawajiri
藤岡琢也
as Dr. Sato
藤山浩二
as Onodera
夏木章
as Ichiro Hirata
北原義郎
as Professor Amano
菅井一郎
as Dr. Matsushita
見明凡太朗
as Self-Defense Force General
Jutarō Hojo
as Self-Defense Force Commander
Kazuko Wakamatsu
as Sadae Hirata
紺野ユカ
as Onodera's Lover
