Plot: With the ship's hull breached, Professor Franklin Babish, his wife, Anne, and their students take refuge in an isolated nearby atoll. As a mutated two-headed great white shark is patrolling the deep waters, attacking and devouring everyone on sight, the lucky survivors must work together, and pluck up the courage to outsmart the bi-headed beast that's twice as deadly as any shark they've ever seen before. Row upon row of razor-sharp teeth await those who will try to challenge the ultimate oceanic predator with the two heads in his natural habitat. Can they lure it to its death?
Alternative Plot: Survivors of a ship that sunk during their semester at sea try to escape from a two-headed shark.
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