Former silent screen cowboy star Jack Hoxie played a Pony Express rider in this, the fourth of six low-budget oaters produced by Majestic. Delivering a valuable deed to El Rio Rancho, Buck Carson (Hoxie) is ambushed by Clem Porter (Matthew Betz) and his gang, who steal the deed. Meanwhile, at El Rio Rancho, Betty Castlear (Marceline Day) releases her horse, Dynamite, into the desert. The animal has been conscripted to the cavalry by Lt. Bob Gray (Lane Chandler), Betty's fiancée. Bringing the wayward horse back to the ranch, Carson stumbles over Porter, who forces him to go to the gang's hangout at the Bar X Ranch. With the aid of sidekick Pancho Gonzales (Julian Rivero), Carson manages to recover the deed, after which he sets the ranch on fire. In retribution, Porter holds Betty and her friend June (Doris Hill) hostage at El Rio Rancho, but they are eventually saved by Carson, Lt. Gray, and the cavalry.