Cattle smugglers are working along the U. S. border with Mexico. Hoof-and-mouth disease is discovered among the stolen cattle. Roy becomes involved when a fellow border patrolman is murdered by the rustlers.
Roy Rogers, Trigger, Dale Evans, Estelita Rodriguez, Pinky Lee, Anthony Caruso, Roy Barcroft, Eduardo Jiminez, Ken Terrell, Emmett Vogan, Maurice Jara, Roy Rogers Riders, George Bamby, Michael Barton, William Boyett, Pat Brady, Jerry Brown, Paul Campbell,
