Three friends head off to the Amazon. Their goal: to prove that cannibalism doesn't exist. With hardly any supplies, or knowledge, or much of anything really, they will just kind of mope around the jungle until they don't find cannibalism, prove their point, and head home.
Meanwhile, two other guys have coincidentally been exploring the same exact area of the massive and dense rain forest and they are less concerned with disproving cannibalism than they are in proving the existence of untold riches they could use for buying drugs.
Little do they all know, cannibals are real, and the cannibals are US!!!!
This movie is a shameless ripoff of Cannibal Holocaust, which, unlike Cannibal Ferox, is actually a good, clever movie filled with unforgettable scenes and memorable characters. Whereas Cannibal Holocaust is the Citizen Kane of cannibal horror films, Cannibal Ferox is the Bio-Dome of this awesome genre.
It's got all the stuff you remember from Cannibal Holocaust: footage of animals being killed, over the top gore, scenes of guys eating animal guts, sweeping aerial shots of the Amazon. It's all there, it's just not done nearly as well and the theme of civilized man as savage ends up being tedious instead of shocking.
The characters are all either totally boring (everyone), or irredeemably evil (Mike)... though Mike is so over the top with his unique mixture of cocaine-fueled sadism and vintage 80s Italian machismo that it's at least worth watching to catch his scenes. If you've exhausted the catalog of 1980s Italian exploitation cannibal horror gorefests, you might as well get it over with and watch this one too.