Scotch John MacGregor has a burning ambition to become as famous an outlaw as his forbear, Rob Roy. And he is well on the way to achieving this aim as he and his gang rampage across the State of Colorado, robbing banks, holding up stagecoaches, and easily eluding the various law enforcement agencies. However, fate takes a hand when Pinkerton agent, Dave Lansom, meets up with the renowned Kentuckian gunfighter, Jack Stone, and together they combine to track down the outlaws. As Scotch John soon discovers, the pair make a formidable team.