Marshal Rocky Lane learns of a plan to obstruct the promotion of natural gas in his town. Bud Galloway, ranch boss for Jeff Chadwick who has just gained his release from prison, is the ringleader of the gang fighting the gas company, headed by Joanne Collier. Galloway tampers the gas line and kills an old man, and Chadwick is blamed. Galloway, knowing that Lane suspects him, hires Dutch Clyburn to kill both Lane and Chadwick. Lane learns that Galloway framed Chadwick for the murder of Joanne's father. Galloway gets his in an explosion, Joanne and Steve Edrington look like they are going to team up, and Rocky and "Black Jack" ride out of town. Evidently heading for El Paso for "El Paso Stampede", as this was the next-to-last film in the series for Allan 'Rocky" Lane and His Stallion "Black Jack." Lane would go on to become the voice of TV's "Mr. Ed", while "Black Jack" retired to a pasture.