When Mexican oil fields are attacked by the burrowing behemoths from the original thriller, veteran "wormhands" Fred Ward and Michael Gross return to take on the creatures and make the worm "turn" permanently. Slithery sequel "Tremors 2: Aftershocks" (1996) also stars Helen Shaver, Christopher Gartin. Then, for the sleepy little desert community of Perfection, Nevada, the last thing the residents needed was a second visit by the gigantic, ground-dwelling "graboids" and their mutant offspring. But once they show up, it's up to a gun-toting survivalist (Gross) to get the townsfolk off the worms' hook. "Tremors 3: Back to Perfection" (2001) also stars Bobby Jacoby, Barry Livingston, Ariana Richards. Finally, have you ever wondered just how a tiny town in the middle of the Nevada desert became home to the man-eating worm monsters o the first three films? You'll find out in the prequel "Tremors 4: The Legend Begins" (2003), set in the 1880s, as a silver mine brings the creatures up from the depths and puts the residents of Rejection Valley in a fight for their lives. Gross, Billy Drago, Sara Botsford star. Two-disc set also includes "Tremors."