A college friend of the local soda-jerk comes to town and lets it be known that he's looking for property on which to build a resort. When he buys some land and suddenly "discovers" there's oil underneath it--and generously offers to sell the townspeople shares in his newly found oil reserves--Dr. Christian suspects a swindle and sets out to prove it.

Roy Rogers, posing as The Carson City Kid, is seeking vengeance on Morgan Reynolds (Bob Steele), the man who killed his brother. To find Reynolds in the gold towns, he systematically stops stagecoaches and goes through the mail, hoping to find letters addressed to Reynolds and thusly learn his whereabouts. Thus "The Kid" earns the reputation of a stagecoach robber, although he never takes anything, and the reputation is enhanced by the fact that he travels with Laramie (Francis McDonald), a notorious half-breed outlaw.

This movie is based on the movie serial. From IMDb: Cowboy singer Gene Autry stumbles upon a civilization buried beneath his own Radio Ranch. The Muranians have developed technology and weaponry such as television and ray guns. Their rich supply of radium draws unscrupulous speculators from the surface.

From Wikipedia: The film loosely follows the life of J.E.B. Stuart (Errol Flynn) before the outbreak of the American Civil War. Among its sub-plots include a romance with the fictional Kit Carson Holliday (Olivia de Havilland), friendship with George Armstrong Custer (Ronald Reagan), and battles against abolitionist John Brown (Raymond Massey). http://www.imdb.com/title/tt0033021/ http://en.wikipedia.org/wiki/Santa_Fe_Trail_(film)