Six American grad students have arrived in Africa to study apes with a renowned professor. But after setting up camp in a jungle clearing, they soon become witness to the carnage inflicted by the strange and remote species.

一队背包族起程到丛林中去探险，其中的一员被一只毒蜘蛛咬伤后致死。他们被迫去寻找Lecorpus博士（一位定居在当地村庄中的美国医生）以寻求帮助。但是他们很快发现其实这是一个圈套，他们已经成为了献给蜘蛛的一个恶毒宗教仪式的筵席之一。