 Marshal Rocky Lane (Allan Lane) learns of a plan to obstruct the promotion of natural gas in his town. Bud Galloway (Roy Barcroft), ranch boss for Jeff Chadwick (Trevor Bardette)who has just gained his release from prison, is the ringleader of the gang fighting the gas company, headed by Joanne Collier (Cathy Downs.) Galloway tampers the gas line and kills an old man, and Chadwick is blamed. Galloway, knowing that Lane suspects him, hires Dutch Clyburn (Robert Bice) 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 (Ray Montgomery)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.