Space aliens arrive on Earth with their giant shark and intend to take over the planet but they must first destroy Gamera.
Gamera vs. Zigra (ガメラ対深海怪獣ジグラ, Gamera tai Shinkai Kaijū Jigura, lit. Gamera vs. Deep-Sea Monster Zigra) is a 1971 Japanese kaiju film directed by Noriaki Yuasa, written by Niisan Takahashi, and produced by Yoshihiko Manabe and Hideo Nagata. It is the seventh entry in the Gamera film series, after Gamera vs. Jiger, which was released the previous year. Gamera vs. Zigra stars Eiko Yanami, Reiko Kasahara, Mikiko Tsubouchi, and Kōji Fujiyama, and features the fictional giant monsters Gamera and Zigra.
Shortly after Gamera vs. Zigra was completed, the film’s production studio, Daiei Film, went bankrupt. As a result, the film was distributed by Dainichi Eihai, receiving a theatrical release in Japan on July 17, 1971. The film was not released theatrically in the United States, instead being released directly to American television by King Features Entertainment in 1987.