A federal agent and his partner track uranium-ore hijackers with radar.

It took a lot of courage to set up a new production company devoted to "B" westerns in 1949, a year when the genre was showing signs of winding down. Filmed in Trucolor, Stallion Canyon was the maiden effort from Kanab Productions, a Utah-based organization. Former Sons of the Pioneers vocalist Ken Curtis made his starring debut in this one, playing a ranch foreman who does his best to track down a rogue stallion. The rest of the cast is comprised of unknowns, save for villains Ted Adams and Forrest Taylor. Cheaply produced, Stallion Canyon has the twin advantages of a relatively new leading man and excellent location photography.

In a rigged gunfight Tom Blake is forced to shoot a man in self defense and is then hunted for murder. After a long trip fleeing the posse he uses a false name and joins the Pony Express which is just about to commence operatons. Relegated to the most dangerous section of the route, he finds himself fighting the District Manager's scheme to sabotage the inital run. But just then a wanted poster with his picture on it arrives.

Riding the plains with Little Beaver and Buckskin Blodgett, Red Ryder encounters bandits trying to hold up the stagecoach carrying Libby Brooks, owner of the Devil's Hole newspaper

Two con-men from the East come out West to join up with Avery. They plan to steal the Lopez diamond from Don Lopez. With the drought, Lopez has sold all of his other jewels for gold so that he can take his people to a better place to live and work. Dean and Soapy try to protect Lopez, but Avery and his gang steal the gold and look forward to stealing the diamond necklace. When Maria offers to become partners with Barrit, it looks bad for Lopez.

Singing cowboy Eddie Dean and his sidekick Soapy (Roscoe Ates) enter into the thick of things when they thwart a stagecoach holdup. Our heroes take it upon themselves to champion the cause of stage-line owner Margie Rodgers (Helen Mowery), who's being victimized by an unknown villain. Dean suspects that there's more to the case than mere robbery, and he's right: someone wants to gain control of Margie's business, and that someone is?

Mountie Matt O'Brien is assigned to escort Miss Owens to a remote outpost. But when he finds an illegal mining operation there that is smuggling gold across the border, his superior Sgt. Means orders him to leave.