A very, very familiar theme in B-westerns, and especially Roy Rogers films, is the idea of a hero being a secret agent whose job it is to ferret out spies and pro-Confederate (South) subversives living in Union (Northern) states during the Civil War. In most cases, the evil folks actually are megalomaniacs who have visions of great power and even riches--and often want to make themselves kings in new countries splintered off from these states!
"Frontier Pony Express" features an early starring role for cowboy Roy Rogers, one in which he acquits himself reasonably well. Set in 1861, Roy's a Pony Express rider and acknowledged as the best in the business, so it would be a major victory for Senator Lassiter Calhoun (Edward Keane) to convince Roy to cast aside his Union loyalties and work for the Confederacy.
Frontier Pony Express finds Roy Rogers cast as the best rider that the Russell,Majors&Waddell firm employs for their new Pony Express. Though it only lasted barely a year the Pony Express has certainly become a legendary outfit.
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