The British Cosh Boy was unsubtly but appropriately retitled The Slasher in the U.S. James Kenney plays Roy Walsh, one of the most thoroughly unpleasant characters ever to appear on screen. When he's not busy beating and robbing the aged and infirm, Roy enjoys slapping around his lady friends. And then one day, he goes too far. Based on a stage play by Bruce Walker, in which James Kenney also starred, Cosh Boy makes few concessions to taste and propriety; as a result, it was in for quite a going over when released stateside. Among the women abused by the "hero" in the course of the film is Joan Collins in one of her first important roles.