Gamera , Daikaij Gamera? , Giant Monster Gamera is a 1965 science fiction kaij film directed by Noriaki Yuasa and released by Daiei Film Co., Ltd. The film focuses on Gamera, a giant ancient chelonian creature who terrorizes Japan after it was awakened by an atomic bomb explosion in the Arctic. The film is the first in a series of kaiju giant monster films featuring the monster Gamera. Gamera was created by Daiei to capitalize on the success of rival studio Tohos popular Godzilla films, and it, too, spawned its own franchise. It was released in the United States in 1966 as Gammera the Invincible and has been the subject of three different Mystery Science Theater 3000 episodes.
In an icy North American region, an unknown aircraft is shot down by an American fighter jet. The aircraft crashes and its cargo, a lowlevel atomic bomb, explodes. The resulting cataclysm awakens a giant, prehistoric monster called Gamera, who has the appearance of a giant turtle with large tusks. Japanese scientists on an expedition including Dr. Hidaka, Kyoko, and Aoyagi nearby are given a devil stone by an Eskimo chieftain, who explains that the creature is called Gamera.Gamera destroys the American jet with his fireball and escapes into the sea. The monster heads to Japan and surfaces from Sagami Bay, where Toshio, a boy releasing his own pet turtle, sees him. Gamera destroys the city of Fujisawa and destroys a lighthouse. However, he also rescues Toshio from falling from that same lighthouse, and then retreats back into the sea. Scientists and government officials hold a conference to discuss killing the monster. ........
Source: Wikipedia