Massive Blood Sucking Monsters!
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.
Attack of the Giant Leeches (1959) is a horror and science fiction film directed by Bernard L. Kowalski, released on July 15, 1959 with a runtime of 1h 2m. It stars Ken Clark, Yvette Vickers, Jan Shepard and Michael Emmet. Viewers rate it 4.0 out of 10 across 88 ratings.
Watch the official trailer for Attack of the Giant Leeches before you stream it.
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 (uncredited)
Joseph Hamilton
as Sam Peters (uncredited)
Walter Kelley
as Mike (uncredited)
Directed by Bernard L. Kowalski, written by Leo Gordon and Leo Gordon, produced by Gene Corman.
Average viewer score of 4.0/10 from 88 ratings.
Suffers massively from an extremely long and boring set-up and not enough giant leeches! B-movie with a huge emphasis on the 'B'. Ace costume work on the actual leeches though once they finally make it on screen. 1.5/5
Reviewed on January 16, 2025
40/100 Giant leeches infiltrate a Florida swamp and people begin disappearing. Typical Roger Corman 50's monster movie with no real story to speak of beyond find and kill the creatures. Has the usual corny characters and the monsters were the obligatory bizarre and cheesy creatures we've all come to know and love. Add a sexy female and there you have it. You may want to watch the MST3K version instead. --…
Reviewed on May 23, 2026
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Attack of the Giant Leeches (1959) is available to stream on Amazon Prime Video, fuboTV, MGM+ Amazon Channel, Philo, MGM Plus, Night Flight Plus, Screambox Amazon Channel, FlixFling, Cultpix, Amazon Prime Video with Ads, Bloodstream and Artiflix, and to rent or buy from Amazon Video, Google Play Movies, YouTube, Fandango At Home, FlixFling and Bloodstream. Streaming availability is checked against JustWatch data and can change by region.
The main cast of Attack of the Giant Leeches (1959) includes Ken Clark, Yvette Vickers, Jan Shepard, Michael Emmet and Tyler McVey. The film was directed by Bernard L. Kowalski. You can see the full cast and crew list, with character names, further up this page.
Attack of the Giant Leeches was released on July 15, 1959 and runs for 1h 2m.
Attack of the Giant Leeches (1959) holds an average rating of 4.0 out of 10 from 88 viewer votes, and is a good pick if you enjoy horror and science fiction films. Read the viewer reviews on this page to decide for yourself.
Yes. The official Attack of the Giant Leeches trailer is embedded in the trailer section of this page and plays instantly, no download or sign-up required.
