In this sci-fi adventure, a spaceship with a peculiar design descends upon a moon base, causing destruction. Meanwhile, at Sea World, dolphins begin to mysteriously perish. A villainous character named Zigra abducts two men and two children, including a young Coke enthusiast, and unleashes devastating earthquakes. However, the two 6-year-old boys cleverly outsmart Zigra and aid their fathers in their escape. The story takes a comical turn as the incapacitated men and children are pursued by the villainous Zigra Woman, who can induce comas with her gaze. The chase ensues throughout Sea World, mimicking the style of a Benny Hill skit. Gamera, a legendary giant turtle, finally intervenes, engaging in an epic battle with Zigra, who transforms into a massive swordfish.

Gamera tai Shinkai kaijû Jigura
Legendary monster Gamera faces off against a colossal shark and an alien invasion force, standing as a formidable barrier to prevent the extraterrestrial beings from taking over the planet.