Gamera: Guardian of the Universe

A plan to dump radioactive waste at sea is disrupted when a mysterious atoll appears at the dumping location. That atoll proves to be something altogether different when hideous flying reptiles, the Gyaos, attack a nearby island-and the atoll rises from the sea. It is Gamera! The super turtle combats both a misguided military and the man-eating Gyaos, with help from a courageous naval officer, an intrepid ornithologist and a beautiful young psychic. (official distributor synopsis)