The staff and vacationers at a first-class resort on the island of Maui are beginning to mysteriously disappear. A biologist believes that an underwater earthquake has caused a giant and very hungry dormant prehistoric fish to be released from its slumber. The fish voraciously helps itself to a tourist buffet. Now it is open season for the local fishermen to find and kill the creature.

Three kingdoms have been overtaken by three evil lords and only Tyor, a teenage boy with magical powers, can restore peace to the land with the help of a bumbling elder, wizard and a hero in each kingdom. Tyor fights alongside them and eventually becomes a powerful wizard in his own right.