92 user 45 critic

Attack of the Giant Leeches (1959)

Approved | | Horror, Sci-Fi | October 1959 (USA)
A backwoods game warden and a local doctor discover that giant leeches are responsible for disappearances and deaths in a local swamp, but the local police don't believe them.


(original story), (screenplay)

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Complete credited cast:
Liz Walker
Jan Shepard ...
Nan Greyson
Michael Emmet ...
Cal Moulton
Tyler McVey ...
Bruno VeSota ...
Gene Roth ...
Sheriff Kovis
Porky Reed (as Daniel White)
George Cisar ...
Lem Sawyer


After local-moonshine swilling trapper Lem Sawyer sees a giant creature, people start disappearing. While searching for illegal traps Steve Benton and Nan Greyson, his girl-friend find Lem dying with giant sucker wounds on his body. One couple Liz Walker and Cal Moulton, forced into the water by her enraged husband Dave Walker, gets taken by the leeches. When police refuse to believe Dave's story, he hangs himself. Soon after this, 2 more trappers disappear, the local Game Warden Steve Benton gets involved. He and Nan's father Dr Greyson realize that the people were taken by the leeches and the leeches live in caves under the swamp. Using dynamite, the 4 missing bodies are discovered and the leeches are destroyed. Written by Matthew Soffen <matt@tuxie.aai.com>

Plot Summary | Plot Synopsis

Plot Keywords:

leech | swamp | cuckold | death | monster | See All (41) »


What was the terrible power of the DEMONS OF THE SWAMP? See more »


Horror | Sci-Fi


Approved | See all certifications »

Parents Guide:





Release Date:

October 1959 (USA)  »

Also Known As:

Attack of the Blood Leeches  »

Box Office


$70,000 (estimated)

Company Credits

Show detailed on  »

Technical Specs


Sound Mix:

Aspect Ratio:

1.37 : 1
See  »

Did You Know?


The film's Spanish title is "El Pantano Diabolico", meaning "The Diabolical Marsh." See more »


Cal and Dave are talking outside the general store. The reflection of the mike boom can be seen in the roof of the car. See more »

Frequently Asked Questions

See more (Spoiler Alert!) »

User Reviews

Chilling Thriller
9 March 2001 | by (United States) – See all my reviews

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.

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Who played 'allen' or 'arron' or whatever? The swarthy young guy? marymorrissey
Steve's buddy Mike construct
'Leeches'? ang-son
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