Japanese scientists on an expedition nearby, Dr. The explosion awakens a giant prehistoric turtle with tusks. The aircraft crashes and its cargo, an atomic bomb, explodes. In the Arctic, an unknown aircraft is shot down by an American jet fighter. This was the only Gamera film in the Shōwa era to be given a theatrical release in the United States. and World Enterprises Corporation as Gammera the Invincible. A localized version with new footage was theatrically released in the United States on Decemby Harris Associates, Inc. Gamera, the Giant Monster was theatrically released in Japan on November 27, 1965.

Yuasa was determined to complete the film with Daiei's resources, despite brief talks of hiring Tsuburaya Productions to finish the film. Due to a low budget and tight schedule, Yuasa was forced to use outdated equipment, faulty props, and faced belittlement from colleagues. Nagata then conceived Gamera to replace Nezura on the schedule. However, the project was shut down by the health department, since the project was to have used dozens of live rats. In 1964, Daiei attempted to produce Nezura, with Yuasa directing. The success of The Birds and Toho's Godzilla films influenced studio head Masaichi Nagata to produce a similar film. In the film, authorities deal with the attacks of Gamera, a giant prehistoric turtle unleashed in the Arctic by an atomic bomb. The film stars Eiji Funakoshi, Harumi Kiritachi, and Junichiro Yamashita. Produced and distributed by Daiei Film, it is the first film in the Gamera franchise and the Shōwa era. 'Giant Monster Gamera') is a 1965 Japanese kaiju film directed by Noriaki Yuasa, with special effects by Yonesaburo Tsukiji. Gamera, the Giant Monster ( 大怪獣ガメラ, Daikaijū Gamera, lit.

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