Gene Autry and his sidekick, Smiley Burnette, are suspected of cattle rustling in this action-packed Republic Pictures Western directed by former actor Mack V. Wright. Actually, Gene and Frog (Burnette) had been chasing a couple of real cattle rustlers, Apache Kid (Max Hoffman Jr.) and Black Jim (Charles King), when they discovered the bodies of two lawmen. Realizing that the rustlers killed their pursuers, our heroes get the bright idea of masquerading in the apparel left by the outlaws. Heading for the border, things get even more complicated, but Gene and his pal manage to stay alive and catch the secret leader of the gang, Joe Stafford (Monte Blue), the supposed upstanding head of the cattlemen's association. When they're not chasing down rustlers, Autry, Burnette, and Al Clauser and his Oklahoma Outlaws perform "The Old Home Place," "Mexicali Rose," and the title tune, all by Sol Meyer, Jule Styne, and Raoul Kraushaar. Rootin' Tootin' Rhythm was partially filmed on-location in Lone Pine, CA, where the production took advantage of a terrific real-life storm.