Wrong Turn 4: Bloody Beginnings (2011)

In 1974, at the Glenville Sanatorium in West Virginia, head doctor Dr. Brendan Ryan gives Dr. Anne Marie McQuiad a tour around the building, entering Cell Ward C, where he introduces her to the young Hillicker brothers, Saw Tooth, One Eye, and Three Finger. After the doctors leave, the brothers use a hair pin to escape from their cell and brutally murder a guard before releasing the other patients. Together, they cause a riot, brutally murdering the orderlies and doctors, including Dr. McQuiad and Dr. Ryan.

29 years later, in 2003, nine Weston University students – Kenia, Jenna, Vincent, Sara, Bridget, Kyle, Claire, Daniel, and Lauren – spend their winter break snowmobiling to their friend Porter's cabin in the mountains. Lost in a snowstorm, they take shelter in the Glenville Sanatorium, not knowing the Hillickers live there as well. Lauren shares stories about the sanatorium and the cannibals, but her friends brush them off. As the rest goes to bed, Vincent explores the asylum and finds Porter's corpse before Saw Tooth kills him with a metal spike.

The next day, the teens remain trapped by the storm, notice Vincent missing and search the entire building for him. In the kitchen, Jenna comes across the Hillickers butchering Porter's body and runs back to warn the others. After Porter's severed head is thrown at the group, Claire is hanged from a balcony with barbed wire and decapitated. The group attempts to flee the building, but their snowmobile's spark plug wires have been stolen by the Hillickers. Lauren skis down the mountain to seek help while the others stay behind and barricade themselves in the doctor's office.

Kyle, Daniel, and Sara go into the basement to get weapons, but Daniel gets abducted, tied to a table in the kitchen, and slowly butchered and eaten alive. The rest of the group chases the cannibals and locks them in a cell. While Kyle stays behind to watch the brothers, the rest search for the spark-plug wires. When Kyle falls asleep, the brothers escape their cell, and the girls accidentally stab Kyle to death after mistaking him for one of the Hillickers. The brothers chase the girls through the building, forcing them to exit through a window, but Jenna is killed before she can escape. The remaining girls are ambushed by the cannibals who use the group's snowmobiles to chase them outside, where Kenia gets injured, and One Eye kills Bridget.

As the day dawns, Lauren has frozen to death, not far from a highway. Kenia is still being chased by One Eye when Sara reappears and knocks the cannibal off the snowmobile, allowing the pair to steal it and escape. They drive into a razor-wire trap set up by the cannibals, which decapitates them. Three Finger picks up their heads and puts them in their tow truck before returning to the sanatorium with his brothers.