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Bud Rand, a cowboy who is charged with the care of Little Billy Rand, accepts an offer to appear with Copeland's Wild West Show to ride a horse called "Mankiller." Dude, Copeland's righthand man, resents Bud's attentions to Mary, one of the performers, and when they fight it out, Bud is the victor. In revenge Dude loosens the cinch on the horse.....