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.
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Gamera vs. Barugon is a 1966 Japanese kaiju film directed by Shigeo Tanaka, with special effects by Noriaki Yuasa and Kazufumi Fujii. Produced by Daiei Film, it is the second entry in the Gamera franchise, and stars Kōjirō Hongō, Kyōko Enami, and Yūzō Hayakawa, with Teruo Aragaki as Gamera. In the film, Gamera returns to Earth to battle a reptilian monster born out of an opal brought to Japan by greedy entrepreneurs.