Natives of a small isolated town defend themselves against strange underground creatures which are killing them one by one.
When an army of Graboids - giant, carnivorous underground worms - threaten the Petromaya oil refinery in Mexico, its owners call on Earl Bassett, who once helped kill four of the creatures in Perfection, Nevada. Having squandered the money that came from his resulting celebrity status, Earl is convinced by the $50,000-a-head bounty offered, as well as the enthusiasm of admirer Grady Hoover, who becomes his partner. At Petromaya, Earl and Grady meet geologist Kate Reilly, and begin Graboid hunting, tricking several Graboids into swallowing bomb-rigged, remote-controlled cars. When they find they're facing a lot more Graboids than they ever expected, Earl calls his friend Burt Gummer, a survivalist who arrives well-stocked with weapons.
Third entry in series returns to the small desert town of Perfection, Nevada seen in the first and briefly in the second.
Burt rescues newcomer Tyler Reed from the government-protected Graboid known as El Blanco. It happens that Tyler is the new owner of Perfection's tourist business and he couldn't have come at a worse time. El Blanco is becoming more aggressive and the Perfection residents have to figure out why before they become the next meal.
Shriekers are spotted in Juniper, Arizona, and Twitchell sends Burt and Tyler to handle the situation. However, the Fish and Wildlife Service are also in town and manage to kill five Shriekers. They also take one alive for study and when it gets a hold of some food, the Shriekers start to multiply again. Now Burt and Tyler have to stop them from massacring the entire town.
An Ass Blaster has arrived in the valley, already having killed two people. After going out after it, Burt and Tyler learn the AB is private property and must be taken in alive. Meanwhile, Jodi and the others take over teaching Burt's survival class
Two Las Vegas criminals named Max and Frank have to lay low before their next crime. With time on their hands, they go to Perfection to settle a disagreement about the existence of Graboids. They soon enough encounter El Blanco, which kills Max and also eats the key needed for their crime. And the only way to get it back is to kill El Blanco.
Larry returns to Perfection and wants to learn more about Cletus Poffenberger. Tyler tells him the story of when the Perfection residents first met Cletus and had to face his increasingly dangerous pet, Four-Twelve.
Three people enter an abandoned silver mine and are attacked by a strange creature, which drains the water from their bodies. Rosalita thinks it's a ghost, but Burt knows it must be something else, especially when two government agents arrive in Perfection.
Burt finds and kills a Shrieker in the valley, only to learn it was apart of a government funded project to train Shriekers for rescue missions. But when a storm knocks out the equipment controlling them, the remaining Shriekers escape and multiply. Now to survive, the Perfection residents must make a stand at Burt's place.
Twitchell sends Burt and Tyler to a small town on the belief a Graboid is responsible for recent disappearances people. But the townspeople believe the real cause for the disappearances are alien abductions and that the government is trying to cover it up.
A team of scientists find a deadly strange animal/plant hybrid growing in the valley. Burt, Tyler and Cletus work with them to figure out how to stop it before it spreads even further. Meanwhile, Perfection has to deal with an over-excited tourist named Larry.
Protesters come to Perfection to force Burt and the others out of the valley, claiming their presence is badly affecting El Blanco's health. This leads to an awkward family reunion when Mindy is apart of the protesters. Even worse, El Blanco begins acting strangely.
Residents of Perfection are facing money troubles and Rosalita decides to take a job at Melvin's latest business venture, the Oasis. But some of the water Melvin uses for the Oasis' lagoon actually came from Perfection and contains Mixmaster, creating a deadly six foot shrimp. And when Melvin's attempt to kill it drives the shrimp out of the lagoon, Tyler and the others will have to stop it before it escapes into the wild.
The valley has an infestation of strange bugs that make loud noises when they are about to feed. They start eating dry wood, but soon enough they move onto meat and begin making their way toward the town. Meanwhile, Larry has decided to move into town.
Frank returns to Perfection with some help in another attempt to kill El Blanco and retrieve the key he swallowed. Meanwhile, Larry encounters a creature in a barn and tries to figure of what it is.
A prequel to Tremors (1990), this movie tells us about the founders of Rejection Valley and how they defended it against the dirt dragons AKA graboids.
The giant, man-eating Graboids are back and even deadlier than before, terrorizing the inhabitants of a South African wildlife reserve as they attack from below-and above.
Burt Gummer (Michael Gross) and his son Travis Welker (Jamie Kennedy) find themselves up to their ears in Graboids and Ass-Blasters when they head to Canada to investigate a series of deadly giant-worm attacks.…
Graboids are illegally taken to a new island resort by a rich playboy as a dangerous form of trophy hunting, and Burt Gummer steps up to save the day.
