Unbeknownst to Hoss Cartwright, the horse he has just purchased previously belonged to a murdered millionaire. As a result, Hoss is railroaded into jail on a murder-theft charge. Threatened with lynching by a band of townsfolk eager to get their hands on the dead man's missing money, Hoss breaks out of jail with the help of black cowboy Child Barnett (Yaphet Kotto), a man who has spent virtually his entire adult life on the run. Others in the cast are John Marley as Sheriff Millet, Harry Hickox as Mayor Bingham, Henry Beckman as Charlie, Bruce Kirby as Chad, and bandleader Frank DeVol as Brother Stoner.