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The last of Bob Steele's six Westerns of Poverty Row company Sono Art-World Wide, Son of Oklahoma was directed by the diminutive cowboy's real-life father, Robert North Bradbury, and filmed on locations in the Mojave Desert near Palmdale, CA. Steele, who broke his arm during the making of the film, plays Dan Clayton, a foundling raised by Mexican Manuel Verdugo (Julian Rivero). When Dan was a child, his mother, Mary (Josie Sedgwick), was forced at gunpoint to leave husband and child in favor of nasty Ray Brent (Earl Dwire). Brent returns to the Clayton wagon and shoots Dan's father, John (Robert E. Homans), in cold blood, happily missing the child. Years later, Dan plans to marry Verdugo's pretty daughter, Anita (Carmen Laroux), and take over the Verdugo's gold mine. Determined to locate the Mexican's hidden mine, Brent promises Mary Clayton, now a saloon owner known as "Shotgun" Mary, to locate her missing son. Dan later finds Mary lost in the desert and brings her to the mine. She realizes that the young man is her son, but keeps silent. Brent, meanwhile, frames Dan in a stagecoach robbery, but Mary helps her son escape from the posse. Determined to return to her former life by selling the saloon, Mary discovers that the local sheriff is her long-lost husband, who had only been wounded by Brent. The latter is killed in a climactic shootout with Dan and the Claytons are reunited at last. One of the few genuine cowgirls to star in series Westerns, Josie Sedgwick had retired in 1926 but was persuaded by producer Trem Carr to return for this one film. Having fulfilled their obligation to deliver six Westerns, Carr and Steele left Sono Art-World Wide in favor of Monogram, which Carr had founded in 1931 with W. Ray Johnston.