Plot
John Hickman and his girlfriend Brooks invite their friends Ben, Wayne, and Quincy to a weekend of hunting and drinking near John's uncle's remote cabin. En route, they stop at a gas station for directions and encounter a van of hippie women and their leader, the Hippie Stranger, who live in a commune in the woods. At the general store, the group learns about a local legend called "The Ripper," a legendary killer hog which supposedly weighs several thousand pounds. The group passes through a hillbilly homestead belonging to the Tibbs clan. When they get to John's uncle's cabin, they find it vandalized and uninhabitable.
The next morning, the group meet brothers Jake and Ricky Tibbs, cousins of John's, who are interested in joining them on a wild hog hunt. An old feud still exists between John and Ricky, a Gulf War veteran showing signs of mental illness. When Jake sets up some targets to see how well the others can shoot, Brooks bests Ben and Wayne's attempts, impressing Tibbs. During the hunt, the group encounters an area called the Big Wallow and use a piglet call as a lure, attracting several boars. Wayne is incapacitated when a boar rams into his leg. Quincy's dog Wolfgang goes charging after the boars, while Brooks shoots at one of them. Ricky realizes the pig they've killed was an adult-sized piglet.
Quincy leads most of the group to a large crop of marijuana plants he discovered while looking for Wolfgang, leaving Brooks with Wayne. John objects to Jake and Ricky taking the plants for profit, as the plants are on his property. A sign posted near the plants leads John to believe that the hippie women are growing pot. During the argument, Ricky snaps and holds John at bay with a crossbow. Ben arrives on the scene and shoots Ricky, thinking he is about to kill John. Jake flees to tell his clan. Quincy and Ben start making their way back to the cabin, while Brooks and John leave Wayne to find something to make a stretcher with to carry Wayne out of the area. Shortly after their departure, Wayne is attacked by something, and fires off a single round. Brooks and John circle back and find him missing, along with Ricky's body.
Meanwhile, Ben and Quincy find Wolfgang's mutilated body in the cabin and determine that he was killed by the Tibbs clan. When the clan appears, Ben manages to kill his pursuer and escape, but Quincy gets caught and is shot in the head. While hiding in the forest, John and Brooks run into the mysterious Hippie Stranger, who tells them that he is looking for an escaped animal, and that they can contact the police from his commune. He helps John and Brooks beat off an attack by the Tibbs clan. Meanwhile, Ben has found the commune, where he is given drugs by several women, and led into an enormous, muddy pen. Ben encounters a dying Wayne, who says that something has been eating him. Ben is shocked by something approaching him.
The remaining Tibbs clan members reach the woods around the commune, where almost all of them are all killed by the hippies, while the remaining man is seized by something else. Brooks and John arrive at the commune with the Hippie Stranger. When John questions why Ben's equipment is there, but not Ben himself, the members force him into a cell, while the leader takes Brooks out into the pen where the Ripper resides. Jake enters the commune and forces one of the women to let him into John's cell. Jake freezes in shock upon seeing the Ripper, and is killed by the hippie he brought with him. The Hippie Stranger prepares to sacrifice Brooks to the boar, whom he and his followers have been worshiping. Brooks pokes the Hippie Stranger with his own cattle prod, attracting the Ripper's attention and leading it to eviscerate him. John kills the Ripper with a crossbow. Brooks and John escape from the commune, where they come face to face with a feral boy perched in a tree, who dropped a dead animal carcass on the group's car earlier.
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