- The Terror Is Back....But This Time It Flies!
- A new breed of terror!
- It all started just as a vacation
- Guess whose coming to dinner?
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'Neil - Anne Kimbrough
- Steve Marachuk - Tyler Sherman
- Lance Henriksen - Steve Kimbrough
- Ricky Paull Goldin - Chris Kimbrough
- Ted Richert - Raoul, Hotel Manager
- Leslie Graves - Allison Dumont
- Ancil Gloudon - Gabby
- Carole Davis - Jai
- Connie Lynn Hadden - Loretta
- Captain Kidd Brewer Jr. - Lou
- Jan Eisner Mannon - Lisa
- Arnie Ross - Mal the Cook
- Tracy Berg - Beverly
- Albert Sanders - Leo Bell, D.D.S.
- Anne Pollack - Mrs. Wilson
- Lee Krug - Ron 'Ronny', the Lifeguard
- Sally Ricca - Cindy
- Dorothy Cunningham - Nurse April