Plankton

A group of five teenagers, including Margareth (Sharon Twomey), Mike (Clay Rogers), Bobby (Michael Bon), Dorothy (Laura di Palma), and Julie (Ann Wolf), get lost in the ocean in a dinghy and stumble upon an abandoned yacht with a mysterious biology lab on board. They soon discover that the yacht is infested with ferocious mutated prehistoric fish, and one of the specimens kills the crew, leading to a harrowing ordeal for the teenagers as they try to survive.