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Having explored the old wheeze about the young man searching for his brother's killer and the one about the cowboy impersonating an outlaw, Robert Emmett Tansey, the producer/writer of Monogram's Jack Randall Westerns, turned to the ever popular "brothers separated during an attack of their wagon train" story. Fortunately, this time around director Spencer Gordon Bennet and his cast traveled to picturesque Lone Pine, CA, and Across the Plains emerged as one of Randall's better vehicles. After a gang of outlaws attack their wagon train, Little Jack (Buddy Cox) is adopted by a roving band of Indians while Little Jimmy (Texi-Ray Cox) is abducted by the outlaws. Years later, the adult Jack (now Jack Randall) and Jimmy (Dennis Moore) meet again but on opposing sides of the law regarding a shipment of gold. Ignorant of the fact that they are brothers, Jack and Jimmy are about to square off when Buckskin (Hal Price), the old wagon master, brings their true relationship to light. Jimmy, now an outlaw known as the Kansas Kid, discovers that a member of his gang, Buff (Robert Card), is the villain who murdered their parents. Mortally wounded in the ensuing battle, Jimmy, alias the Kid, meets his maker with the knowledge that the death of his parents has been avenged at last. Jack, meanwhile, proposes to Mary Masters (Joyce Bryant), the daughter of the stage line owner.