Plot: 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.
Alternative Plot: After spending all the reward money from his first encounter with the giant man-eating worms called "Graboids," Earl Bassett (Fred Ward) agrees to hunt more of the deadly creatures at a Mexican oil refinery for $50,000 each. Knowing that he cannot face the monsters alone, Earl recruits Burt Gummer (Michael Gross), another veteran of the incident in Nevada, to supply the firepower. There is only one problem: The Graboids have now evolved to attack above ground.
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