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Attack of the Giant Leeches (1959)

Approved  |   |  Horror, Sci-Fi  |  October 1959 (USA)
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Ratings: 3.4/10 from 2,946 users  
Reviews: 88 user | 52 critic

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 ... See full summary »


(original story), (screenplay)
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Title: Attack of the Giant Leeches (1959)

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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 <>

Plot Summary | Plot Synopsis


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


Horror | Sci-Fi


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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 »


Mike wires the explosives to the detonator box and the plunger is all the way up as he walks over to Steve and the rest of the group. Steve then walks over to the detonator box to set off the charge but now the plunger is down, he has to pull up before he pushes it down to set off explosives. See more »

Frequently Asked Questions

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User Reviews

Leeches take no prisoners
25 October 2004 | by (Brentwood, USA) – See all my reviews

Another of the many giant creature movies from the '50's, this one being somewhere in the middle of the bunch. This time, it's swamp hicks who are being menaced by leeches. Not just leeches, but big, mean leeches! I tell you, it's a load of cheese from beginning to end, but this is what one would expect from a genre movie of this era. It's a movie that leaves you asking, "why don't the fools just get a pound of salt and waste 'em?" Anyway, it's an OK effort with some decent acting. But those leeches, oh boy! The monsters are strictly tongue-in-cheek! So, B-movie fans should love this one, it's a wonder it took four years for this movie to make it to Mystery Science Theater 3000. In any event, proceed with caution into the boggy swamps of schlock.

** out of ****

15 of 16 people found this review helpful.  Was this review helpful to you?

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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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