| CAST | CONNECTIONS | |
|---|---|---|
| Marshall Grauer | Dr. Kurt Leopold | |
| Wade Popwell | The Monster | |
| Paul Galloway | Sheriff Lou Krantz | |
| Gerald Cruse | Marine Biologist Rex | |
| Sanna Ringhaver | INPIT Agent Martha Walsh | |
| Dave Dickerson | INPIT Agent Walker Stevens | |
| Nancy Lien | Girl Camper | |
| Russell Holcomb | (no title) | |
| Gloria Brady | (no title) | |
| Del Galloway | (no title) | |
| Hal Nearhoof | (no title) | |
| Jim Merrill | Boy on porch | |
| Elizabeth Barton | Girl on porch | |
| Bob Knowles | (no title) | |
| Carol Thompson | (no title) | |
| Jack Weatherford | (no title) | |
| Doug Thomas | Reporter | |
| Frank Crowell | (uncredited) | |
| Archie Valliere | Deputy Sheriff | |