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Plot summary

Slugs (1988) Plot Summary & Timeline

Slugs (1988) movie poster

Slugs is a 1988 horror film directed by Juan Piquer Simón, running 1 hour 29 minutes. This page retells the whole story in 540 words (about 2 minutes to read) and covers 14 key events in order, 13 characters, where and when it is set and 3 themes. Looking for the cast, ratings and where to stream it? See the movie page for Slugs.

to read the plot summary
2 min
key events in the timeline
14
characters profiled
13
themes explained
3
Slugs (1988) movie poster
Released
Runtime
1h 29m
Genre
Horror
Original language
English
No spoilers

What Is Slugs About?

The premise of Slugs in 322 words, with nothing given away. The full story follows below.

In the quiet town of Ashton, the ordinary rhythms of suburban life are suddenly shadowed by an unsettling whisper of danger. Beneath the neat lawns and familiar storefronts lies a hidden network of sewers that seems to pulse with an unspoken menace, turning the town’s most mundane infrastructure into a source of dread. The atmosphere is thick with a low‑key, almost bureaucratic horror, where the line between everyday routine and grotesque threat blurs, leaving the community on edge while the world outside remains blissfully unaware.

Mike Brady works as a health inspector and sewer manager, a man whose job keeps him close to the town’s underbelly and whose practical mind makes him the first to notice the odd irregularities slipping through the cracks. Practical, diligent, and driven by a quiet determination, he finds himself drawn into a mystery that challenges his scientific worldview. At home, his partnership with his supportive wife adds a personal dimension to his growing obsession, grounding his fear with a sense of ordinary life that refuses to be ignored.

When a string of inexplicable deaths begins to ripple through Ashton, the town’s officials remain skeptical, brushing aside Mike’s uneasy intuition. This tension pulls him into uneasy alliances with Sheriff Reese, whose law‑enforcement perspective clashes with Mike’s methodical approach, and with a visiting British expert on mollusks, whose arrival signals that the threat may be far stranger than anyone imagined. The stakes rise as the community’s denial deepens, creating a charged atmosphere where rational explanations are dismissed in favor of uneasy silence.

The film unfolds with a blend of gritty, practical effects and a creeping, almost claustrophobic tension that keeps viewers guessing. Its tone balances outright terror with darkly comic moments, making the everyday a potential conduit for horror. As the town’s hidden waterways become the focal point of an unseen predator, the story invites audiences to wonder what lurks just beneath the surface of an ostensibly tranquil world.

Full plot

What Happens in Slugs?

The complete story of Slugs, from the first scene to the last, in 540 words (about 2 minutes). Spoilers throughout. Names in the text link to 9 cast member pages.

Spoilers ahead

In the fictional town of Ashton, a grim night ends with Ron Bell, Stan Schwartz, eaten alive by a massive swarm of carnivorous slugs right inside his living room. The next day, Mike Brady, Michael Garfield, a health inspector and sewer manager, along with Sheriff Reese, John Battaglia, head to Ron’s home to serve an eviction notice, only to discover a nearly skinless body and trails of slime winding from the basement that defy easy explanation.

Later, Mike and his co-worker Don Palmer, Philip MacHale, are summoned to clear a sewer blockage, where Don uncovers several animal carcasses wedged in the pipes, hinting that something unthinkable lurks beneath the town. In the meantime, Harold Morris, Juan Maján, a local gardener, unwittingly slips a slug into his glove; the creature bites his hand, and chaos unfolds as he knocks over chemical jars, causing a fire that triggers a gasoline tank explosion, killing both him and his wife Jean Morris, Lucía Prado, in a brutal, fiery accident.

Back at home, Mike’s wife Kim Brady, Kim Terry, shares the news of the spread of danger as they discover abnormally large, aggressive slugs in their own garden. Mike collects a few specimens in a jar and consults John Foley, Santiago Álvarez, the town’s science teacher, hoping for answers. Foley witnesses one of the slugs attack and devour the class hamster, underscoring the threat the slugs pose.

The menace escalates as the slugs attack and kill two teenagers, while Mike’s friend David Watson, Emilio Linder, unwittingly consumes a slug that had been concealed in a salad prepared by his wife. The following morning, Mike and Reese are tasked with investigating the teen deaths, and Mike stubbornly suggests the slugs as the culprits, though his theory is dismissed by officials who distrust his claim.

Don then discovers that the locations of the murders align with the town’s sewer network, reinforcing the idea that the slugs’ aggression may be tied to something dumped into the wastewater. A separate chain of events unfolds as David falls ill in a restaurant, bleeding from the nose and collapsing as blood flukes burst from his eyes, a grotesque sign of the infection spreading through the town.

Seeing the pattern, Mike pleads with the town mayor to cut off the downtown water supply, hoping to starve the creatures, but his warnings fall on deaf ears. In the school lab, Foley introduces lithium-based arsenic that could kill the slugs in the sewers, and Mike convinces Don to join a plan to deploy it. Foley prepares a large batch of the arsenic, while Mike and Don storm the sewer system to confront the breeding ground.

That night, Don falls into the underground lair and is eaten by the insatiable slugs, a grim reminder of the danger they face. Mike then collaborates with Foley to pump the arsenic into the sewer using a firetruck hose, triggering an explosive reaction that destroys the slug population beneath Ashton, even though the detonation causes significant damage to much of the town.

As emergency services arrive and Kim reunites with Mike, the final twist reveals that, despite the widespread destruction, a single slug has survived the explosion, leaving a silent reminder that the threat may not be entirely eradicated.

Timeline

Slugs Timeline: Every Key Event in Order

14 key events in the order they happen, from “Ron Bell attacked by slug swarm” to “Into the sewers and the explosive end”. 14 events name a place, across 14 locations.

  1. 1

    Ron Bell attacked by slug swarm

    In the dead of night, a swarm of carnivorous slugs invades Ron Bell's living room and consumes him. The scene is gruesome and smeared with slime, signaling something far beyond a normal nuisance. The town remains unaware of the horror that has just occurred.

    When:Late night Where:Ron's living room, Ashton

  2. 2

    Morning discovery and basement slime trails

    The following day, health inspector and sewer manager Mike Brady and Sheriff Reese go to Ron's home to deliver an eviction notice and discover his near-skinless body. Exploring the house, Mike finds multiple slime trails leading from the basement, but he and Reese cannot determine what exactly happened to Ron. The clues hint at something crawling beneath the town.

    When:Next day Where:Ron’s house, Ashton

  3. 3

    Sewer blockage and carcass discoveries

    Mike and Don Palmer fix a sewer blockage and uncover animal carcasses stuck in the pipes. The disturbing finds indicate a larger threat connected to the town's subterranean network. The men begin to suspect a link between sewage and the strange deaths.

    When:Same day Where:Town sewer system

  4. 4

    Slug attack and fatal explosion at Harold Morris’s home

    Local gardener Harold Morris discovers a slug inside his gardening glove, which begins to eat his hand. In the ensuing struggle, he knocks over chemical jars, sparking a fire that ignites a gasoline tank and explodes. The blast kills Harold and his wife Jean, turning Harold's garden into a gruesome scene.

    When:Later that day Where:Harold Morris's garden/home

  5. 5

    Kim informs Mike; large slugs in the garden

    Back at home, Mike is informed by his wife Kim about the deaths. They then discover a group of abnormally large and aggressive slugs in their garden. The couple begins to realize the town's pests are not ordinary creatures.

    When:Later that day Where:Mike Brady's home and garden

  6. 6

    Slug investigation begins

    Mike collects several slugs in a jar and takes them to school science teacher John Foley for examination. Foley witnesses one slug attack and eat the class hamster, confirming the slugs' dangerous nature. The investigation moves from rumor to tangible threat.

    When:Same day Where:Mike's home to Foley's school lab

  7. 7

    Slugs attack two teenagers

    In another town incident, the slugs attack and eat two teenagers, escalating the fear among residents. The town starts to panic as the slug threat expands beyond the initial households. Authorities are slow to connect the incidents.

    When:Next day Where:Town neighborhoods

  8. 8

    David ingests slug; illness begins

    Mike's friend David unknowingly eats part of a slug hidden in a salad prepared by his wife. He soon falls ill as the slug-related disease begins to manifest, foreshadowing the broader danger to the town.

    When:Same period Where:David's home and dining area

  9. 9

    Investigation begins; disbelief

    The next morning, Mike and Sheriff Reese are brought in to investigate the teenagers' deaths. Mike postulates that slugs are responsible, but his theory is dismissed as crazy by authorities. The town's skepticism deepens as the evidence accumulates.

    When:Following morning Where:Town offices

  10. 10

    Sewer origin theory

    Don discovers that the murder sites align with the layout of the town's sewer system. He theorizes that toxins from an abandoned toxic waste dump nearby could be making the slugs more aggressive. The idea shifts the investigation toward environmental contamination.

    When:Later that day Where:Don's observation location; sewer map area

Show the other 4 events of Slugs
  1. 11

    David's restaurant incident and second spike

    While dining at a restaurant, David experiences a nosebleed and collapses. Soon after, blood flukes erupt from his eye sockets, underscoring the severity of the slug invasion spreading through the town. The incident heightens pressure on officials to act.

    When:After the earlier events Where:Restaurant

  2. 12

    Mayor dismissal and water warning

    Mike pleads with the town mayor to cut off the downtown water supply to starve the slugs of their habitat, but the mayor dismisses him as crazy. The town remains in denial as the threat grows.

    When:Shortly after David's incident Where:Town hall / mayor's office

  3. 13

    Arsenic plan to kill the slugs

    In the school lab, Foley reveals a lithium-based arsenic compound designed to kill the slugs in the sewers. Mike and Don agree to work together to deploy the poison. The plan marks a turning point in the town's response to the invasion.

    When:Soon after Where:School lab

  4. 14

    Into the sewers and the explosive end

    That night, Mike and Don enter the sewer and locate the slugs' breeding ground; Don is eaten by a slug. Foley helps by pumping the arsenic into the sewer from a firetruck hose, triggering an explosive reaction that destroys the slugs but devastates much of the town. A single slug survives the blast, and emergency services arrive as Kim reunites with Mike.

    When:Night Where:Sewer system and town

Characters

Who Are the Main Characters in Slugs?

13 characters, among them Mike Brady (actor: Michael Garfield), Kim Brady and Don Palmer: who each one is and the part they play in the story. Every profile links to the actor’s page.

  • MB

    Mike Brady (actor: Michael Garfield)

    Played by Michael Garfield

    Health inspector turned crisis investigator who relentlessly links the slug outbreak to the town’s sewer system. He remains practical and stubbornly logical, pushing through bureaucratic skepticism to protect his family and the community. His determination drives the investigation and risky countermeasures.

    • 🔬 Investigator
    • 🧠 Persistent
    • 🛡️ Protective
  • KB

    Kim Brady

    Played by Kim Terry

    Mike’s wife and a high school teacher who offers practical support and keeps the home front stable as the crisis unfolds. She witnesses the creeping threat and embodies the personal stakes behind the larger disaster.

    • 🏫 Teacher
    • 💞 Wife
    • 🧭 Loyal
  • DP

    Don Palmer

    Played by Philip MacHale

    Mike’s practical coworker who helps investigate the sewer outbreak. He accompanies Mike into dangerous areas and ultimately becomes a casualty in the fight to destroy the slugs.

    • 🤝 Partner
    • 🧰 Practical
    • 🧨 Sacrificial
  • HM

    Harold Morris

    Played by Juan Maján

    Local gardener whose encounter with a slug in his glove triggers a fatal chain of events leading to a house explosion. His death marks the escalation of the crisis and the reach of the slug threat into everyday life.

    • 🌿 Gardener
    • 🥽 Hazardous
    • 🔥 Accidental
  • JM

    Jean Morris

    Played by Lucía Prado

    Harold Morris’s wife who dies in the explosion caused by the slug-related containment attempt, underscoring the human cost of the disaster.

    • 💔 Victim
    • 👩 Partner
    • 🌡️ Tragic
  • RB

    Ron Bell

    Played by Stan Schwartz

    Alcoholic and early victim whose death signals the spread of the slug threat and prompts the investigation.

    • 🍺 Drunk
    • 🧭 Alarm
    • ⚰️ Victim
  • SR

    Sheriff Reese

    Played by John Battaglia

    Local law enforcement who initially doubts Mike’s theory but becomes involved in the investigation as the crisis escalates.

    • 🛡️ Authority
    • 🧭 Skeptic
    • 🤝 Collaboration
  • JF

    John Foley

    Played by Santiago Álvarez

    School science teacher who studies the slugs and helps develop arsenic-based countermeasures, aiding the investigation.

    • 🧪 Scientist
    • 🧠 Analytical
    • 🧭 Cooperative
  • DW

    David Watson

    Played by Emilio Linder

    David’s illness after unknowingly ingesting a slug illustrates how far the threat reaches into daily life.

    • 🍽️ Victim
    • 🧪 Contaminated
    • 🤒 Ill
  • MW

    Maureen Watson

    Played by Alicia Moro

    David’s wife, whose involvement highlights how personal relationships intersect with the unfolding crisis.

    • 👪 Family
    • 🧠 Connected
    • 🧭 Involved
  • ME

    Mayor Eaton

    Played by Manuel de Blas

    The town’s mayor who initially dismisses warnings, choosing political stability over immediate action.

    • 🏛️ Authority
    • 🤔 Skeptic
    • 🗳️ Leadership
  • BI

    Boy in Boat (Erik Swanson)

    Played by Erik Swanson

    A teen who is among the victims as the slugs spread, illustrating the indiscriminate reach of the infestation.

    • 🧒 Teen
    • 🩸 Victim
  • GI

    Girl in Boat (Karen Landberg)

    Played by Karen Landberg

    Another teen victim who encounters the slug threat during the spread through the town’s waterways.

    • 🧒 Teen
    • 🩸 Victim
Setting

Where and When Is Slugs Set?

Slugs is set in Ashton. Here is why the place matters to the story.

Where

Ashton

Ashton is a quiet fictional town that becomes ground zero for a carnivorous slug outbreak. The local sewer system and water infrastructure are shown as crucial battlegrounds as the body count rises. The setting underscores how a sleepy town can unravel under a sudden ecological threat.

  • 🏘️ Small town
  • 🧪 Pollution
  • 🐌 Slugs
Themes

What Are the Themes of Slugs?

3 ideas the story keeps returning to, among them Environmental Pollution, Nature Strikes Back and Civic Skepticism.

  1. 01

    Environmental Pollution

    A long-abandoned toxic waste dump leaks into the town's sewer system, mutating the slugs into aggressive predators. The movie uses the outbreak to critique negligence around hazardous waste and municipal oversight. Efforts to deploy chemicals to kill the slugs show the limits of technology when faced with a cascading ecological crisis. The explosion in the sewer alters the town's fate, illustrating how pollution can escalate beyond control.

  2. 02

    Nature Strikes Back

    The slugs become agents of nature, preying on people and animals as a reminder that ecosystems can retaliate against human carelessness. The creatures’ expansion into homes and streets heightens the sense of escalating peril. Practical effects emphasize the visceral threat of the infestation and its unpredictability.

  3. 03

    Civic Skepticism

    Mike Brady’s warnings are dismissed by officials and the town’s mayor, delaying crucial action. The crisis exposes the tension between belief, authority, and community safety in a tight-knit town. The resolution demonstrates how decisive listening and cooperative action are essential to survive such a disaster.

Tone & mood

What Kind of Film Is Slugs?

Dark in tone, with fast pacing and a straightforward story, going by the plot summary.

Tone
Dark
Pacing
Fast
Story
Straightforward
Intensity
High
Ending
Ambiguous

A fast-paced and intensely gory creature feature that builds relentless dread as a small town is besieged by carnivorous slugs, creating a dark and horrific atmosphere punctuated by graphic violence and body horror.

  • gory
  • tense
  • anxious
  • gruesome
  • dread-filled
  • oppressive
  • creature feature
  • biological horror
  • survival horror
  • small town invasion

Content notes: graphic violence, body horror, animal death, gruesome death, infection, explosion.

Quiz

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Where to watch

Where to Watch Slugs

Stream it on Amazon MX Player and Amazon Prime Video, or rent or buy it from Amazon Video and Google Play Movies. US availability and prices from JustWatch.

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FAQ

Slugs Plot Questions

5 quick answers about Slugs, taken from the plot summary, character guide and setting on this page and the film’s credits.

What is Slugs about?

In the quiet town of Ashton, the ordinary rhythms of suburban life are suddenly shadowed by an unsettling whisper of danger. Beneath the neat lawns and familiar storefronts lies a hidden network of sewers that seems to pulse with an unspoken menace, turning the town’s most mundane infrastructure…

Read the full plot summary

When and where does Slugs take place?

Slugs is set in Ashton. Ashton is a quiet fictional town that becomes ground zero for a carnivorous slug outbreak. The local sewer system and water infrastructure are shown as crucial battlegrounds as the body count rises.

The setting explained

Who are the main characters in Slugs?

The story follows Mike Brady (actor: Michael Garfield) (played by Michael Garfield), Kim Brady (played by Kim Terry), Don Palmer (played by Philip MacHale) and Harold Morris (played by Juan Maján); the character guide covers 13 characters in all.

All the characters

What are the main themes of Slugs?

The summary picks out 3 themes: Environmental Pollution, Nature Strikes Back and Civic Skepticism.

The themes explained

Who directed Slugs?

Slugs (1988) was directed by Juan Piquer Simón and runs 1 hour 29 minutes.

Juan Piquer Simón’s films

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