Slugs

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.