Directed by
| Bernard L. Kowalski | ... | (directed by) |
Writing Credits
| Leo Gordon | ... | (original story by) |
| Leo Gordon | ... | (screenplay by) |
Cast (in credits order) verified as complete
| Ken Clark | ... | Steve Benton | |
| Yvette Vickers | ... | Liz Walker | |
| Jan Shepard | ... | Nan Greyson | |
| Michael Emmet | ... | Cal Moulton | |
| Tyler McVey | ... | Doc Greyson | |
| Bruno VeSota | ... | Dave Walker | |
| Gene Roth | ... | Sheriff Kovis | |
| Dan White | ... | Porky Reed (as Daniel White) | |
| George Cisar | ... | Lem Sawyer | |
| Rest of cast listed alphabetically: | |||
 |
Guy Buccola | ... | Giant Leech (uncredited) |
| Joseph Hamilton | ... | Old Sam Peters (uncredited) | |
|
|
Walter Kelley | ... | Mike (uncredited) |
|
|
Bill Scully | ... | Search Party Member (uncredited) |
| Carl Sklover | ... | Search Party Member (uncredited) | |
|
|
Ross Sturlin | ... | Giant Leech (uncredited) |
Produced by
| Gene Corman | ... | producer (produced by) |
| Roger Corman | ... | executive producer |
Music by
| Alexander Laszlo | ... | (music by) |
Cinematography by
| John M. Nickolaus Jr. | ... | director of photography |
Editing by
| Carlo Lodato | ... | (edited by) |
Art Direction by
| Daniel Haller | ... | (as Dan Haller) |
Production Management
| Jack Bohrer | ... | production manager |
Second Unit Director or Assistant Director
| John C. Chulay | ... | assistant director (uncredited) |
Art Department
| John Cengia | ... | props |
| Richard M. Rubin | ... | property master (as Dick Rubin) |
Sound Department
| Al Overton | ... | sound |
Camera and Electrical Department
| Charles Rosher Jr. | ... | first assistant camera |
Editorial Department
| Anthony Magro | ... | associate editor (as Tony Magro) |
Additional Crew
| Kinta Zertuche | ... | production secretary |
