Zigra

is a 1971 Japanese kaiju film directed by Noriaki Yuasa, written by Niisan Takahashi, and produced by Yoshihiko Manabe and Hidemasa 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. It was a tie-in film with the aquarium Kamogawa Sea World which was founded in the previous year.

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.

Without warning, an alien spaceship attacks a Japanese Moon base. Back on Earth, young Kenichi (Kenny in the English dubbed version) Ishikawa, his father Dr. Yosuke (Henry in the English dubbed version) Ishikawa, his friend Helen Wallace and her father, Dr. Tom Wallace, witness the spaceship descending into the ocean. They go to investigate, but are soon captured by a teleportation beam that brings them aboard the spaceship. Inside the spaceship, a human-looking woman appears to them and reveals that she is of an alien race called the Zigrans. By way of demonstrating Zigran technological prowess, she creates a gigantic earthquake that wreaks havoc in Japan. She had previously caused two other earthquakes, one in Peru and the other in Arabia (in the English dubbed version, it mentions instead the Indian Ocean). She then tells her prisoners of the planet Zigra's history and its great scientific advances which, unfortunately, have resulted in its destruction; but in searching for a new home, Zigra has found Earth.

The woman contacts authorities on Earth and orders them to surrender, or she will kill her prisoners. Tom declares that the Zigran woman is insane and, in anger, she sends the two men into a hypnotic trance. Kenichi and Helen take action, successfully using the ship's control console to escape with their fathers. Enraged, Zigra orders the woman to go to Earth and kill the children. She says it would be simpler to kill all the people of Japan, but Zigra tells her that humans must be preserved so they can be used for food. Now Gamera, intent on discovering the identity of the alien interloper, flies in to save the day and rescues the children and their fathers. The U.N. authorities, after questioning Kenichi and Helen, resolve to attack Zigra. The Defense Force jets scramble, but the Zigran spaceship makes short work of them with its powerful lasers. The alien woman arrives on earth, disguised as a normal human, and begins her search for Kenichi and Helen. She hitches a ride with a Kamogawa Sea World dolphin trainer back to the facility, which the military is now using as its center of operations. She finds the two children, but before she can catch them, they run away from her.