Dynamite fishing in a rural swamp revives a prehistoric gill monster that must have the blood of human females in order to survive.
| Actor | Role |
|---|---|
 Gloria DeHavenGinny Glenn / Adrianna | Ginny Glenn / Adrianna |
 Aldo RaySheriff Neal Rydholm | Sheriff Neal Rydholm |
 Marshall ThompsonDr. Brad Wednesday | Dr. Brad Wednesday |
 Leo GordonDr. John Warren | Dr. John Warren |
| GGlen VorosAlan Tanner | Alan Tanner |
| CCarol TerryMay Tanner | May Tanner |
| RRohay NorthChuck Pierce | Chuck Pierce |
| LLou HuntKim Pierce | Kim Pierce |
| EEd ClarkDeputy Jensen | Deputy Jensen |
| RRobert FryWallace Fry | Wallace Fry |
| LLeroy WinbushTerry Taylor | Terry Taylor |
| DDan KillianBill Beckley | Bill Beckley |
| DDon DanielJim Hotchkiss | Jim Hotchkiss |
| PPat HopkinsFirst Girl on Bike | First Girl on Bike |
| JJanel PaylowSecond Girl on Bike | Second Girl on Bike |
| JJeff SchwaabThe Bog Monster | The Bog Monster |