De las profundidades surgen unos humanoides mutados, que acechan especialmente a muchachas playeras en bikini.
 | Doug McClure | Jim Hill |
| Ann Turkel | Dra. Susan Drake |
| Vic Morrow | Hank Slattery |
| Cindy Weintraub | Carol Hill |
| Anthony Penya | Johnny Eagle |
| Denise Galik | Linda Beale |
| Lynn Theel | Peggy Larson |
| Meegan King | Jerry Potter |
| Breck Costin | Tommy Hill |
| Hoke Howell | Deke Jensen |
