Two biologists and an assistant trek out to an extremely remote, swampy region of Australia to conduct field studies. It soon becomes apparent that they are not alone in the marshland. An evil presence begins to stalk them. It wants to hunt them down one-by-one and kill them. What started as a by-the-books scientific field trip become a terrifying struggle for survival. The biologists experience bizarre, hallucinogenic events that keep them off balance and questioning their own sanity. Their goal now is to make it back out of the swamp in their right minds and alive.