Egotistical land developer Mike Stark hires a scientist by the name of Hofstadter to develop a defoliant that would help him clear out an Amazonian rain forest, that's on the property he's recently bought in South America and where he's preparing to build his latest business project, more easily. Hofstadter goes to visit the location himself and learns that the locals are quite scared and worried, since some of those that Stark hired to clear out the jungle have been found torn apart and there's even talk that something other than animals is preying on them in the jungle. After witnessing a strange religious ceremony, even Hofstadter begins to feel that something isn't right. Stark is convinced that wild animals are behind the attacks and that the locals are just being superstitious. However, he decides to visit the location himself. Archaeologist Dr. Christine DuMaurier, who's investigating the nearby mysterious jungle ruins of an unknown and now supposedly extinct tribal culture ...