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Attack of the Giant Leeches is an independently made 1959 black-and-white science fiction-horror film, produced by Gene Corman and directed by Bernard L. Kowalski. It stars Ken Clark, Yvette Vickers and Jan Shepard. The screenplay was written by Leo Gordon.
The film was released by American International Pictures on a double bill with A Bucket of Blood. Later, in some areas in 1960, Leeches played on a double bill with the Roger Corman film House of Usher.
In the Florida Everglades, a pair of larger-than-human, intelligent leeches live in an underwater cave. They begin dragging locals down to their cave, where they slowly feed on them, draining their victims of blood. Two of the first victims of the leeches are local vixen Liz Walker (Vickers), who has been cheating on her husband (Bruno VeSota), and Liz's latest paramour. Game warden Steve Benton (Clark) sets out to investigate their disappearance. Aided by his girlfriend, Nan Grayson (Sheppard), and her father, Doc Grayson, Benton discovers the leeches' underwater cavern. The creatures are destroyed when Steve, Doc and several state troopers blow up their underwater cavern using dynamite.
List of deaths 
List of deaths in the film, Attack of the Giant Leeches
- Lem Sawyer - Partially drained of blood by Giant Leeches - Partially
- Cal Moulton - Gradually drained of blood by Giant Leeches - Yes
- Liz Walker - Gradually drained of blood by Giant Leeches - Yes
- Dave Walker - Hung into rope noose by Himself - Yes - Suicide
- Porky Reed - Gradually drained of blood by Giant Leeches - Yes
- Old Sam Peters - Gradually drained of blood by Giant Leeches - Yes
- Giant Leech - Stabbed with knife by Steve Benton - Yes
- Giant Leech - Blown up by dynamite explosion by Steve Benton - Yes
- 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
- Joseph Hamilton as Old Sam Peters
- Walter Kelley as Mike
- Guy Buccola as Giant Leech
- Ross Sturlin as Giant Leech
The movie was one of a spate of "creature features" produced during the 1950s in response to cold war fears. A character in the film speculates that the leeches have been mutated to giant size by atomic radiation from nearby Cape Canaveral.
The film was shot over 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 is important to add, that actress Yvette Vickers appeared as the Playmate centerfold in the July 1959 issue of Playboy magazine, several months prior to the film's release.
Attack of the Giant Leeches holds a 70% approval rating on review aggregation website Rotten Tomatoes, based on 10 reviews; the average rating is 5.1/10. Film critic Leonard Maltin awarded the film 1.5 out of 4 stars, calling it a "ludicrous hybrid of white trash and monster genres".
A remake of the film was made on July 7, 2008. It was directed by Brett Kelly and written by Jeff O'Brien. A stage adaptation of the original was also performed at The Village Theatre in Atlanta, Georgia in February 2020.
In July 1992, Attack of the Giant Leeches was featured as a fourth-season episode of the film-mocking television series Mystery Science Theater 3000. It was also featured on the nationally syndicated horror host television show Cinema Insomnia, and in the second episode of season 5 of Shilling Shockers, a New England-based television show hosted by the witch Penny Dreadful XIII.
Being in the public domain, Attack of the Giant Leeches has received numerous bargain bin DVD releases. The MST3K version of the film was released on October 26, 2004 by Rhino Home Video as part of a box set, The Mystery Science Theater 3000 Collection: Volume 6. Cheapskate Theater released an HD download of the film on June 7, 2016 featuring a new introduction by Toby Radloff and Radloff outtakes and bloopers.