Johnny Mack Brown plays the supervisor of a remote pony express station. He is occasionally visited by comic sidekick Fuzzy Knight, and by leading lady Nell O'Day (a much better rider than most of her male costars). Trouble comes in the form of Indians and desperadoes, often by way of stock footage from earlier Universal films. Brown handles any and all comers with his usual six-gun aplomb. And that's about it for Pony Post.