Seven high-schoolers would rather be anywhere else on a Saturday than on a science class field trip to a desert cave, but their teacher Mr. Whitney (Henry Czerny - The Pink Panther, Clear and Present Danger) is the cool one. Ana Maria (Sandra Echeverría - TV's 'Marina') and her fellow students soon learn that the real reason their teacher brought them here is to gather evidence of an entity... which all seven of them - one-by-one - become prey to.