Kevin and his girlfriend Evelyn are camping in the woods when she is abducted and impregnated by otherworldly beings. As the entity within her begins to grow, Evelyn discovers that her cravings can only be satisfied by human flesh and blood.

After his best friend dies in a racing accident, biking star Joe agrees to go back on the wheels for an exhibition in Chile. On a test run with his girlfriend Stephanie, they stumble upon a badly injured man dying from a mysterious virus. That's the start of a very bad day for them as they become the target of relentless killers ready to do anything to keep their secret to go out of the mountains.