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Ken Clark as Steve Benton
Yvette Vickers as Liz Walker
Jan Shepard as Nan Greyson
Michael Emmet as Cal Moulton
Tyler McVey as Doc Greyson
Bruno VeSota as Dave Walker
Gene Roth as Sheriff Kovis
Dan White as Porky Reed
George Cisar as Lem Sawyer
Guy Buccola as Giant Leech
Joseph Hamilton as Old Sam Peters
Walter Kelley as Mike
Ross Sturlin as Giant Leech

Attack of the Giant Leeches is a low-budget 1959 science fiction film from American International Pictures, directed by Bernard L. Kowalski and produced by Gene Corman. The screenplay was written by Leo Gordon. It was one of a spate of monster movies produced during the 1950s in response to cold war fears; in the film, a character speculates that the leeches have been mutated to giant size by atomic radiation from nearby Cape Canaveral.

The film has also been released as Attack of the Blood Leeches, Demons of the Swamp, She Demons of the Swamp, and The Giant Leeches.



In the Florida Everglades, a pair of larger-than-human, intelligent leeches are living in an underwater cave. They begin dragging local people down to their cave where they hold them prisoner and slowly drain them of blood.

One of the first people to be so taken is the local vixen, Liz Walker, played by Yvette Vickers. After a couple of gratuitous displays of flesh (Vickers appeared as the centerfold in the July 1959 issue of Playboy), and some running around on her husband (Bruno VeSota), Liz finds herself a prisoner of the leeches along with her current paramour. Game warden Steve Benton (Ken Clark) sets out to investigate their disappearance. Aided by his girlfriend Nan Grayson (Jan Sheppard) and her father, Doc Grayson, he discovers the cavern.

The monsters are finally destroyed when Steve, Doc, and some state troopers blow up the cavern with dynamite.


The film was shot in eight days, including outdoor sequences at the Los Angeles County Arboretum and Botanic Garden. During filming Gene Corman came down with pneumonia and wound up in the hospital.

It was Kowalski's second film for AIP following Night of the Blood Beast.

Home media

Attack of the Giant Leeches has received numerous "bargain bin" releases.
The MST3K version of the film was released by Rhino Home Video as part of the "Collection, Volume 6" box set.


In July 1992, Attack of the Giant Leeches was featured as a fourth-season episode of movie-mocking television show Mystery Science Theater 3000. Attack of the Giant Leeches was also featured on the nationally-syndicated horror host television show Cinema Insomnia.[4] It was also featured in episode two of season five of "Shilling Shockers", a New England based television show hosted by the witch Penny Dreadful XIII.

A remake of the film was released by Brain Damage Films in 2012.