A remake of Hal Roach's b&w One Million B.C. and the clearer precursor of the two to Jean-Jacques Annaud's fabulous Quest for Fire, what with its characterization of nascent classism now colour-coded, the Hammer production also takes a page from Bert I. Gordon in unleashing prehistoric monsters on civilization and yet manages even less credibility than your average Gordon concoction by turning his freak-of-nature beasties into a mere anachronism: "The Flintstones" be damned, cavemen and dinosaurs never got the chance to interact.