The below article is about the movie Tremors; for other uses of the term see Tremor
Tremors is a fictional movie set in Perfection, Nevada. In the movie, the tiny town suddenly comes under attack from a giant, subterranean worm-like creature that would later be called a Graboid. The citizens of the town are forced to defend themselves from the predatory monsters, which are able to learn very quickly, but can only track prey by sound. Among the citizens is Burt Gummer, who is obsessed with military technology and tactics, which came extremely handy in helping the people of the town survive.
The movie has two sequels and a spinoff series on the SciFi Channel.
In the second movie, Burt Gummer is hired by Mexico to defeat the local Graboids that have recently moved in. The Graboids have had time to eat and grow, however and enter the next phase of their development, a walking animal with a heat sensor instead of a sound sense. They reproduce asexually by eating sufficient food, and as such are extremely dangerous. This new life-stage is later named Shrieker.
In the third movie, the Graboids have returned to Perfection after 11? years. The citizens must again defend themselves. Unfortunately, the Graboids become Shriekers by the time anything can be done since the geophone sensors have been unpowered due to lack of maintenance and interference from the United States Department of the Interior. In another unfortunate turn, there is one albino Graboid that cannot transform into Shriekers, and Burt and the fellow citizens who are help him hunt the Shriekers are kept trapped on a rock overnight by the "El Blanco", the white graboid. After escaping, they find that yet another phase of the Graboid life cycle is loose... one that can mix volatile chemicals to rocket off the ground and can glide around for a while. This life cycle became known as an "Ass Blaster" after their method of propulsion.
After this, SciFi has made a series based in Perfection. "El Blanco" is alive still, protected by the endangered species act, and the citizens are dodging a land developer and emanent domain with the unwilling help of a DOI agent assigned to the valley. Odd events seem to be attracted to the valley, and many run-ins with Graboid spawn as well as mutated gene-spliced creatures created by a chemical used in a secret government lab that was in the valley in the past, but the chemical ("Mix-Master") has now leaked. The chemical doesn't affect humans, but it spreads throughout the environment and creates dangerous mutant bacteria, insects and other animals. As a result, the valley is a magnet for tourists, who are thrilled with the danger. Nevertheless, an inordinate number of guests end up dead. Luckily Burt and the citizens of Perfection are able to keep the monstrosities at bay.
