A scuba diving instructor, her biochemist boyfriend, and her police chief ex-husband try to link a series of bizarre deaths to a mutant strain of piranha fish whose lair is a sunken freighter ship off a Caribbean island resort.

Tricia O'Neilas Anne Kimbrough
Steve Marachukas Tyler Sherman
Lance Henriksenas Police Chief Steve Kimbrough
Ricky Paull Goldinas Chris Kimbrough
Leslie Gravesas Allison Dumont
Carole Davisas Jai
Connie Lynn Haddenas Loretta
Roberto D'Ettorre Piazzoli