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John MacKenzie vows revenge! Talbot and his cattle thieves hired by Patton, the lord of Holbrook who would like to grab half of Arizona at the expense of the ranchers, have destroyed one of his herds destined for the Navajos of Tex, killing some of his men. Meanwhile, in the city, discontent is artfully mounted against Sheriff Walker, to have him ousted by Jerry Nolan, a stooge of the boss. And while MacKenzie and his men are about to fall into a deadly ambush set up by Patton's thugs, the pards arrive just in time to resolve the firefight!