Splinter (2008)

"It will get under your skin."
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When their plans for a nature trip go awry, Polly and boyfriend Seth decide to check into a motel. On their way, they're carjacked and kidnapped by low-rent crooks Dennis and Lacey, who take the victims and their SUV to a nearby gas station. Along the way, they encounter an increasingly terrifying horde of parasites, and if any of them intend to survive, they'll have to outsmart the deadly organisms.

Charles Bakeras Blake Sherman Jr.
Jill Wagneras Polly Watt
Paulo Costanzoas Seth Belzer