Splinter

When a young couple embarks on a romantic camping trip in the Oklahoma woods, they never expected to encounter a terrifying threat. After being carjacked by a pair of criminals, they find themselves stranded at a remote gas station, where they discover a mysterious parasite that infects its victims and turns them into bloodthirsty monsters. As the creature continues to claim more victims, the group must band together to survive and uncover the truth behind the deadly fungus. But as they fight for their lives, they realize that the parasite may be more powerful than they ever imagined, and that their only hope for survival may be to confront the horror head-on. Starring Jill Wagner, Paulo Costanzo, Shea Whigham, and Rachel Kerbs, Splinter is a heart-pumping horror thrill ride that will leave you on the edge of your seat.

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Some movies that have similar genres and were produced around the same time as Splinter include 6 Souls, Megan Is Missing, The Skeleton Key, A Serbian Film, Deadgirl, Thirst.