A giant octopus, mutated by nuclear tests in the dark waters of the Pacific, is heading toward the California coast. This science fiction and adventure classic by Robert Gordon brings a radioactive threat from the depths of the ocean to the screen. As the giant creature takes the coastline hostage and underwater tension escalates, submarine commanders and scientists find themselves in a race against time. Blending stop-motion animation, the film conveys the silent panic gripping coastal cities and the weight of the impending disaster.