After a handful of non-formula westerns, Charles Starrett returned to the mixture as before in Thundering Frontier. Starrett plays Jim Fillmore, kind to old ladies, small animals and heroine Norma Belknap. In contrast, the villains are kind to no one, least of all struggling building contractor Square Deal Scottie, whose projects are continually targeted for demolition and his payroll is forever being stolen at gunpoint. A good 25 percent of the film's running time is given over to Bob Nolan and the Sons of the Pioneers, whose C&W croonings are pleasant but a bit much.

Charles Starrett
as Jim Filmore

Iris Meredith
as Norma Belknap

Ray Bennett
as Ed Filmore

Alex Callam
as Square Deal Scottie

Carl Stockdale
as Andrew Belknap

Fred Burns
as Hank Loomis

Bob Nolan
as Bob

John Tyrrell
as Bartender Mac

Francis Walker
as Henchman Stub

John Dilson
as Carter Filmore