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A travelling circus provides the background for this "Three Mesquiteers" western. One of the circus owners is a counterfeiter, who when he's caught with the goods shifts the blame to his partner. Our three heroes Stoney (Robert Livingston), Tucson (Ray "Crash" Corrigan) and Lullaby (Max Terhune), an old friend of the falsely accused partner, combine their skills to spring their pal out of the calaboose. Meanwhile, Stoney pitches woo at heroine Mary (Maxine Doyle) -- who almost manages to march the hapless fellow down the aisle. An average "Mesquiteers" entry, Come On, Cowboy is still superior to practically any other "B" western of the period.