A prospector discovers natural cement and suggests it should be used for a new dam. But this is the last thing the badmen of Trail End want, as they have a monopoly of the wagons needed to haul rocks to the site. A pretty sheriff notwithstanding, it's a job for a singing marshal.

Gene Autry
as U.S. Marshal Gene Autry

Champion
as Gene's Horse

Sheila Ryan
as Sheriff Carol

Robert Livingston
as Sam Brady

Frank Jaquet
as Banker Hodges

Vince Barnett
as Joe - Barber

Syd Saylor
as Deputy Skeeter

Sandy Sanders
as Deputy Bud

Pat Buttram
as Smokey Argyle

Stanley Andrews
as Chalmers (uncredited)