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Two warring caveman tribes find their 800 year feud coming to a head in this French comedy featuring Gerard Depardieu and Jean Rochefort. The filthy primitives in the Dirty Hairs have yet to discover the secret of shampoo, while their counterparts the Clean Hairs keep their manes clean and tangle free. When the chief of the Dirty Hairs sends his daughter undercover to steal some shampoo from the Clean Hairs, her mission is complicated by an unforeseen crime. The Clean Hairs' healer has snapped, killing two of his own tribesmen. Of course no one suspects the healer to be a murderer, so in order to root out the culprit the chief of the Clean Hairs dispatches two of his best men - curly-haired Pierre and blond-haired Pierre.