After undersea explosions near a Caribbean island, prehistoric creatures are unleashed on the unsuspecting population.
| Actor | Role |
|---|---|
 Ward RamseyBart Thompson | Bart Thompson |
 Paul LukatherChuck | Chuck |
| KKristina HansonBetty Piper | Betty Piper |
| AAlan RobertsJulio | Julio |
| FFred EngelbergMike Hacker | Mike Hacker |
| WWayne C. TreadwayDumpy | Dumpy |
| LLuci BlaineChica | Chica |
| HHoward DaytonMousey | Mousey |
| JJack YoungerJasper | Jasper |
| JJames LoganT.J. O'Leary | T.J. O'Leary |
 Gregg MartellThe Neanderthal | The Neanderthal |