Barugon, hatches. Upon arriving to Kobe Harbor, the ship is suddenly destroyed. Ichiro finds Onodera, who tells him that Keisuke and Kawajiri died in the jungle. Having grown to immense size, Barugon surfaces from the harbor and proceeds to attack. While debating how to recover the opal, which he still believes to be aboard the sunken ship, Onodera inadvertently blurts out that he killed his two companions and then murders both Ichiro and his wife to cover up his crime. Barugon's rainbow ray attracts Gamera and the two battle in Osaka. However, Barugon freezes Gamera in place. Keisuke and Karen find Onodera, subdue him, and leave him tied up in his home. Keisuke and Karen suggest a plan to the defense ministry by using a huge diamond to lure Barugon into a lake to drown. The plan fails due to the diamond's insufficient radiation. Another attempt by irradiating the diamond with additional infrared radiation almost succeeds, until Onodera interferes and steals the gem. However, both he and the diamond are devoured by Barugon. Keisuke discovers that mirrors are not affected by Barugon's rainbow ray, so the military devises a plan to reflect its own rainbow emanation back with a giant mirror. Barugon is wounded, but realizing its mistake, refuses to shoot another rainbow. Gamera thaws out and attacks Barugon once again. After battling, Gamera drowns Barugon in Lake Biwa, then flies away. Keisuke mourns over the events caused by his greed, believing he is now alone. However, Karen holds his hand and tells him he is not alone. Cast Kojiro Hongo as Keisuke Hirata Kyōko Enami as Karen Yūzō Hayakawa as Kawajiri Takuya Fujioka as Dr. Satō Kōji Fujiyama as Onodera Akira Natsuki as Ichirō Hirata Yoshirō Kitahara as Professor Amano Ichirō Sugai as Dr. Matsushita Bontarō Miake as Self-Defense Force General Jutarō Hōjō as Self-Defense Force Commander Kazuko Wakamatsu as Sadae Hirata Yuka Konno as Onodera's lover Eiichi Takamura as Governor of Osaka Kenichi Tani as Lee Kōichi Itō as Metropolitan Police Superintendent-General Hikaru Hoshi as Awaji Maru captain Osamu Abe as Awaji Maru crewman Yoshihiro Hamaguchi as Awaji Maru crewman Teruo Aragaki as Gamera Production Crew Shigeo Tanaka – director Noriaki Yuasa – special effects director Kazufumi Fujii – special effects Atsuji Shibata – production designer Yonejiro Saito – planning Yukio Okumura – audio recording Masao Segawa – assistant director Yoshizo Numata – production manager Hiroshi Yamaguchi –