🎯 Quick Overview
Trailer
- Director: Bernard L. Kowalski
- Genre: Horror, Sci-Fi, Thriller, Creature Feature, B-Movie
- Release year: 1959
- Runtime (length): 1h 2min
- IMDb rating: 3.7/10 (5.1K votes)
- Rotten Tomatoes: 29%
😅 Plot Summary – Badly Explained
Giant rubber leeches show up in a swamp and suck the blood out of cheating spouses and nosy rednecks until a game warden with great chest hair decides dynamite is the best conservation tool.
🍿 Attack of the Giant Leeches: Detailed Plot Synopsis
Mysterious Disappearances in the Swamp
Strange events begin plaguing a small community near a remote swamp. Locals report sightings of large, unusual creatures, though many are quick to dismiss these tales as tall tales or the result of too much moonshine. However, when individuals start vanishing without a trace, alarm grows, and the disappearances can no longer be ignored.

Personal Drama Leads to Tragedy
Amidst the growing mystery, a local store owner discovers his wife is having an affair. In a fit of rage, he pursues his wife and her lover into the swamp, forcing them into the water. This confrontation tragically leads them directly into the path of the monstrous inhabitants of the swamp, becoming the latest victims.

Investigation and More Victims
The local game warden, Steve Benton, and a doctor begin investigating the strange deaths and disappearances. Skepticism from the local sheriff hinders their efforts, but as more people searching for the missing also vanish, the grim reality of something monstrous in the swamp becomes undeniable. Their investigation points towards an unknown, dangerous presence.

Discovery of the Underwater Lair
Following clues and the continued disappearances, the investigators theorize the creatures might be holding their victims in an underwater location. Using diving gear, the game warden explores the depths of the swamp. He discovers a hidden cave where the horrifying truth is revealed: giant, blood-sucking leeches are responsible for the attacks, keeping their victims alive to feed on.

⚠️ Spoilers and Ending Explained
🎬 Cast & Characters
- Steve Benton (Ken Clark): A determined game warden who takes the lead in investigating the mysterious disappearances in the swamp.
- Liz Walker (Yvette Vickers): A restless and unfaithful wife whose affair leads her and her lover to become early victims of the giant leeches.
- Nan Greyson (Jan Shepard): Steve’s supportive girlfriend and the local doctor’s daughter who joins his investigation into the swamp horrors.
- Cal Moulton (Michael Emmet): Liz Walker’s secret lover who disappears with her in the swamp after being confronted by her husband.
- Doc Greyson (Tyler McVey): The local doctor whose medical examination of a victim helps confirm the presence of a large, unknown creature.
- Dave Walker (Bruno VeSota): Liz’s jealous husband who witnesses the giant leeches attacking his wife and her lover, but is initially accused of murder.
- Giant Leech (Guy Buccola): The monstrous, blood-sucking creatures responsible for dragging victims into their underwater cave dwelling.
💬 Memorable Quotes
- Dave Walker: “I’ll look at you any way I want! You’re my wife!” – Said angrily to his unfaithful wife, Liz, during an argument about her behavior.
- Sheriff Kovis: “Don’t give me any of that crud about monsters.” – Dismissing the initial reports from locals about strange creatures in the swamp as nonsense.
- Doc Greyson: “The marks… are like those that would be made by the tentacles of a giant squid or octopus.” – Describing the strange wounds found on the body of one of the first victims, suggesting an unnatural attacker.
- Steve Benton: “Alright. Let her go.” – Giving the order to detonate the explosives in the swamp to destroy the giant leeches.
- Mike: “Oh no. I’ve done enough of your dirty work. Help yourself.” – Responding to Steve’s request to detonate the final explosive, indicating his reluctance after their ordeal.
💰Box Office
- Budget: $70,000
- Domestic Gross: Unknown
- Worldwide Gross: Unknown
💥 Attack of the Giant Leeches Reviews
Personal Review
Okay, so I finally watched ‘Attack of the Giant Leeches’, and wow, what a ride! You go in expecting cheesy monsters, and you totally get them, but there’s actually more to it than just guys in trash bags. The whole swamp setting is genuinely moody and oppressive. And the human drama, especially that whole messed-up situation with Liz and her husband, was way more captivating than I thought it would be. Yvette Vickers really brings it. Yeah, the leeches look silly when you see them clearly, but those underwater scenes in the cave where they’re just silently clinging to their victims? Honestly, that was pretty creepy and stuck with me. Plus, the movie is only an hour long, so it doesn’t overstay its welcome. It’s perfect for watching with friends and yelling at the screen!
- Who would enjoy:
- “Fans of 1950s science fiction and horror B-movies”
- “Viewers who enjoy campy or ‘so bad it’s good’ films”
- “Mystery Science Theater 3000 viewers”
- “Enthusiasts of creature features and monster movies”
- “People interested in early Roger Corman productions”
- Content warnings ⚠:
- “Dated and sometimes disturbing creature effects (leeches feeding)”
- “Mild gore (bloodless bodies)”
- “Depiction of adultery and domestic conflict”
- “Suicide (implied hanging)”
- “Stereotypical portrayals of rural Southern characters”
Professional Reviews
- Analysis of user reviews: “Despite its legendary B-movie status and often-mocked effects, ‘Attack of the Giant Leeches’ offers surprising atmosphere and narrative drive for its era and budget. The performances, particularly from the supporting cast playing the colorful locals, are more grounded than expected. While the monsters themselves are cheesy, the underwater cave sequences manage a genuine creepiness that transcends the low-fi production.
- Analysis of user reviews: “This Roger Corman production is exactly what you’d expect: fast, cheap, and packed with schlocky charm. The plot about mutated leeches terrorizing a swamp community is paper-thin, but the film embraces its premise with earnestness. Highlights include the delightfully lurid melodrama involving the town ‘tramp’ and her jealous husband, plus the sheer absurdity of the creature designs. A fun, if flawed, dive into 50s drive-in horror.
- Analysis of user reviews: “More than just fodder for mockery, ‘Attack of the Giant Leeches’ has a certain atmospheric quality and a script that attempts actual character interaction, unusual for its type. The setting feels authentic, and the drama between the human characters holds interest between monster appearances. Though the title creatures are laughably fake, the film is briskly paced and delivers its modest thrills effectively. A solid example of 50s low-budget creature features.
Audience Reactions
People can’t get over how cheesy the giant leech costumes are, often comparing them to sleeping bags or garbage bags.: Many viewers find the movie surprisingly entertaining and well-paced for a low-budget 50s film, often enjoying the human drama and swamp atmosphere alongside the monster schlock.
Overall Consensus: A beloved, albeit notoriously low-budget, classic B-movie creature feature celebrated for its campy charm, surprisingly engaging human elements, and memorable cheesy monsters.
Awards
🛠️ Behind the Scenes
- “The film was shot in just 8 days on a budget of approximately $70,000.”
- “Filming for the swamp scenes took place at the Los Angeles County Arboretum & Botanic Garden, standing in for the Florida Everglades.”
- “The creature costumes were notoriously low-budget, often described as looking like trash bags or sleeping bags with suction cups, and reviewers sometimes noted visible elements like oxygen tanks.”
- “According to director Bernard L. Kowalski, producer Gene Corman helped push the camera raft during water filming to save money on crew, resulting in Corman spending time in the hospital due to illness contracted in the water.”
🖥️ How to Watch Attack of the Giant Leeches?
As a classic B-movie from the 1950s, ‘Attack of the Giant Leeches’ is often found in public domain collections. It may be available to stream on platforms specializing in classic or public domain cinema, or rentable/purchasable on services like Apple TV, Prime Video, and others, depending on current distribution rights. Physical media like DVD and Blu-ray collections featuring multiple vintage horror or sci-fi films are common places to find this movie for purchase.

🎥 Similar Movies
If you enjoyed Attack of the Giant Leeches, you might like these similar films:
- Creature from the Black Lagoon (1954): A classic Universal monster film featuring an iconic Gill-Man and significant underwater sequences in a swampy setting, sharing thematic elements of nature disturbed by human activity and mysterious aquatic creatures.
- The Wasp Woman (1959): Another low-budget horror film from producer Roger Corman released in the same year, featuring a human-turned-monster and sharing the typical pacing and production values of 1950s drive-in fare.
- Baby Doll (1956): While a drama, it shares the element of depicting sordid small-town Southern dynamics, particularly focusing on infidelity and a dysfunctional marriage, with Yvette Vickers appearing in a similar ‘Southern tramp’ role in ‘Leeches’.
- Tremors (1990): A modern take on the ‘isolated community attacked by subterranean monsters’ premise, blending creature feature horror with intentional humor, appealing to fans who appreciate the unintentional camp of older B-movies.
- Manos: The Hands of Fate (1966): Infamous for its low production quality and bizarre story, it’s a prime example of a cult classic B-movie significantly popularized by ‘Mystery Science Theater 3000’, appealing to fans who enjoy ‘Leeches’ for similar campy and riffable qualities.
🛒 Attack of the Giant Leeches Related Products
- Attack of the Giant Leeches (Midnite Movies Double Feature): Own this B-movie classic alongside another thrilling Roger Corman production, often paired together for maximum retro horror fun.
- Classic Sci-Fi Monster Movie Posters Book: A collection featuring iconic posters from the 1950s and 60s B-movie era, including films like ‘Attack of the Giant Leeches’ known for their sensational artwork.
- Creature from the Black Lagoon Funko Pop! Vinyl Figure: A popular collectible figure representing one of the most iconic swamp creatures from the same era, capturing the charm of classic monster design.
- Horror B-Movie Marathon Digital Collection: A digital bundle featuring a curated selection of classic low-budget horror and sci-fi films from the 1950s and 60s, perfect for theme nights.
🎧 Soundtrack
Attack of the Giant Leeches features a captivating soundtrack that enhances the movie’s atmosphere and emotional impact. Here are some notable tracks:
- “Main Title / Swamp Theme” – performed by Alexander Laszlo
- “Creature Attack” – performed by Alexander Laszlo
- “Underwater Cave” – performed by Alexander Laszlo
You can find the complete soundtrack on Amazon Music and Apple Music.
🤨 FAQ
The monsters are mutated, human-sized leeches with suckers, capable of dragging victims underwater and draining their blood. They are often depicted as men in rubber or fabric suits.
While not explicitly detailed, a brief mention suggests the giant size might be a result of atomic testing or radiation exposure, a common trope in 1950s sci-fi monster films.
For modern audiences, the film is generally not considered truly scary due to its low budget and dated effects. However, some scenes, particularly the underwater cave sequences and the depiction of the leeches feeding, were intended to be chilling and may still create an eerie atmosphere for some viewers.
It is widely considered a classic B-movie with noticeable flaws like cheap effects and sometimes wooden acting. However, many fans appreciate it for its campy charm, engaging (for its genre) story, and character interactions, often viewing it as ‘so bad it’s good’.
Yes, ‘Attack of the Giant Leeches’ was famously featured as an episode of the television show ‘Mystery Science Theater 3000’ (MST3K), contributing significantly to its modern-day cult following.
🔥 Bonus Content
Dark Corners – Attack of the Giant Leeches: Review
Curious what a channel dedicated to obscure horror and cult flicks thinks of ‘Attack of the Giant Leeches’? Dive into the ‘Dark Corners’ review to see if this creature feature holds up, or just serves as monster movie fodder!
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