Gene Autry leaves the West behind (at least temporarily) in Roundup Time in Texas. Hired to deliver a herd of horses to his diamond-mining brother, Autry and his sidekick Frog Millhouse (Smiley Burnette) journey all the way to Africa. Hoping to get rid of the Autry boys and move in on the diamonds themselves, the villains frame Autry on a smuggling and murder charge. It's up to heroine Gwen (Maxine Doyle), the daughter of the murder victim, to clear Gene and place the blame where it belongs. Musical support is provided by the Five Cabin Kids, a quintet of talented black youngsters who previously appeared with Our Gang and W.C. Fields.