In 2052, Earth has achieved peace until it is threatened by an alien race known as Death Force from a dying solar system. These aliens are frantically searching for a new home and launch a massive attack on Earth with their satellite ship called Terror Star. They begin to transform the planet into their own habitat. The only hope for humanity lies in the hands of Colin Collins, along with his group of fellow students, who must operate a highly classified underwater vessel capable of battling the invaders either in space or at sea.