The only chance to escape a desert island is to convert the plane carrying many different animals into a boat.

High school student Dan Bartlett misses the plane he was supposed to be on with his rich girlfriend and her family on the way to a Caribbean vacation during a school break. He flies there alone, and runs into a series of characters and misadventures as he tries to catch up.

Several people disappear from and at the sea. Their bodies are found gnawed to the skeleton, even the marrow is missing. The scientists have no idea which animal could do such things. Dr. Turner begins to suspect that the company which builds a tunnel beneath the bay might have poisoned the environment and caused an octopus to mutate to giant dimensions...