Step N. Mud
Member
First time for me watching this and late at night. Kurt Russell and posse, having it out with the troglodyte's. Not a flick for everyone. 

About cannibal cave men? We have later examples among pre Aztecs in the American SW.
But cannibalism existed among primative and modern humans.
Peter Capstick discussed them in his book, Maneaters, and this has been discovered among prehistoric humans.
Sounds like a more graphic version of the ape men on, The Lost World.
But bone tomahawks probably exist.