| Photos (See all 19 | slideshow) |
| 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) | |
| Ross Sturlin | ... | Giant Leech (uncredited) | |
Directed by | |||
| Bernard L. Kowalski | |||
Writing credits | ||
| Leo Gordon | (original story) | |
| Leo Gordon | (screenplay) | |
Produced by | |||
| Gene Corman | .... | producer | |
| Roger Corman | .... | executive producer | |
Original Music by | |||
| Alexander Laszlo | |||
Cinematography by | |||
| John M. Nickolaus Jr. | (director of photography) | ||
Film Editing by | |||
| Carlo Lodato | |||
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 | |||
| 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) | |
Other crew | |||
| Kinta Zertuche | .... | production secretary | |
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| King Kong | Earth vs. the Spider | The Giant Gila Monster | The Painted Veil | The Thing from Another World |
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| Full cast and crew | Company credits | External reviews |
| News articles | IMDb Horror section | IMDb USA section |
This unusual blend of Southern white trash and blood-curdling terror features a good narrative, capable performances by most, excellent musical score, and a misty, shadowy, eerie atmosphere. Despite other negative reviews, this and many other small-budget 1950s are continually being released on DVD and video, to the delight (and distributors' profits) of horror fans. Ken Clark is adequate playing the stalwart hero, as a surprising (for is time) ecologically-minded ranger overseeing a Southern bayou swampland. Third-billed Jan Shepard is really the leading lady here, getting more scenes and close-ups than Yvette Vickers, who basically appears in early scenes, than basically disappears. Shepard is earnest and very pretty, and lends semi-feminism to the proceedings, by joining boyfriend Clark in the swamp, seeking murderous radiation-produced mutations. Shepard appears, 1950s style, in her first and last scenes, with her hair down, in an off-the shoulder white dress, well made-up, walking near a swamp! At least she's not in high heels! Vickers is slinky perfection as the adulterous wife of Bruno Ve Soto, another fine actor. Gene Roth as Shepard's doctor father is also convincing. All these are "finished" actors, professionals who have amassed many credits through the years. While the leech costumes may disappoint, the unnerving cave scene won't. This film does in 65 minutes what other "blockbuster", star-cast thrillers can't.