In 1973, Gamera sacrifices his life to rid the world of the Gyaos once and for all. Thirty-three years later, a small boy, whose father witnessed the 1973 event, named Toru finds a mysterious egg. From it, hatches a small Turtle. Toru and his friends raise the turtle, who turns out to be a small Gamera. After a new man-eating creature named Zedus shows up in Japan, it's up to the small Gamera to save the world as the previous Gamera had done before.