After a sudden underwater tremor sets free scores of the prehistoric man-eating fish, an unlikely group of strangers must band together to stop themselves from becoming fish food for the area's new razor-toothed residents.
Johnny is a successful banker who lives happily in a San Francisco townhouse with his fiancée, Lisa. One day, inexplicably, she gets bored of him and decides to seduce Johnny's best friend, Mark. From there, nothing will be the same again.
When two researchers discover a colossal shark's tooth off the Mexican coast their worst fears surface - the most menacing beast to ever rule the waters is still alive and mercilessly feeding on anything that crosses its path.