Reb Russell (Reb Russell), undercover agent for the Cattleman's Protective Association, goes into the stronghold hideout of rustler chief Bull Thompson (Fred Kohler) posing as an outlaw. He falls in love with Marion, Bull's step-daughter. Juan (Dick Botiller), a gang member once jailed by Reb, reveals Reb's true identity, but he will be given his and Marion's freedom to leavy the valley if he can beat Thompson in a fight. He does, but Butch Greer (Jack Rockwell), a gang member trying to take over from Thompson leads the gang after the pair, after first revealing to Thompson that Reb is Thompson's own son, whom he last saw as a baby when Thompson, then known as Big Bill Russell,was forced to flee the law. Thompson and loyal gang member Blackie (Edmund Cobb), who was once helped by Reb, go after the gang in an effort to help Reb and Marion escape.
A caravan of settlers is arriving and the ranchers intend to keep them out. It looks like a range war but Sheriff Jim gets the ranchers to accept the settlers.
Steve Beaumont, an operative for the Cattleman's Protective Association, is assigned the difficult task of breaking up a murderous gang of rustlers led by Ed Brock and Strang.
An operative from the Wells Fargo company goes undercover to trap a crooked sheriff and his equally nefarious hirelings in this standard B-Western from A.
Arriving at Medicine Bow, eastern schoolteacher Molly Woods meets two cowboys, irresponsible Steve and the "Virginian," who gets off on the wrong foot with her.
Mountie Tim O'Hara is sent to Indian River to investigate a fur trading racket. But he quickly finds himself in trouble when he is accused of shooting a prisoner in the back and is then put in jail by a fellow Mountie.
Swifty is framed for the murder of Alec MeNiel by the Lawyer Cheevers and the stepson Price. Then they incite the locals to form a lynch mob, but Swifty has an unexpected ally in the Sheriff who knows Price was after his stepfather's land.
The parents (Horace B. Carpenter)(Vane Calvert) of Smokey Smith (Bob Steele) are murdered while traveling with a wagon train that is attacked by outlaws.
