Maritime Safety Officer Luke foresees the Stellanova cruise ship attacked by a prehistoric giant Great White Shark, but his warning is scorned by Jensen. The shark smashes the ship, devours passengers. Survivors flee to an island. Jensen's selfishness endangers the team, and his killing of a shark pup enrages the mother shark. Rescue mission wiped out, the shark evolves to come ashore. Luke leads survivors to set a trap for a final showdown with the shark.