Prairie Express: Johnny Mack Brown comes to the aid of a beleaguered female freight line operator in this standard Monogram oater directed by veteran Lambert Hillyer. Having saved his old friend Faro Jenkins and young Dave Porter from marauding outlaws, Ranger Johnny Hudson learns that the attack may be part of a concerted effort by bandits to drive Dave's sister Peggy out of the freight business. Unbeknownst to Johnny and the Porters, the crimes are committed on behalf of local banker Gordon Gregg who wants to bankrupt the freight business in order to take over the valuable Porter ranch.