Capt. James Stewart pursues the bandit "The Kinkajou" over the Mexican border and falls in love with Rita, though he suspects that her brother is the bandit.
Bill Hollister (Jack Hanlon) organizes a wagon train to break the unfair monopoly held by Jake Lynch (Tom Santschi) on food prices in the mining camps. The Rambler (Ken Maynard) joins the train when it leaves for Gold Hill, and takes command when Hollister is killed from ambush. Jacques Frazelle (Al Ferguson) schemes to get rid of The Rambler and win Sue Smith (Edith Roberts). He plots with Lynch to disrupt the train, but The Rambler beats him in a whip-fight...
Henry Weatherby is buying up ranch land to sell as right of way for a new road. When he sends his son Dick and his nephew Pete to kick the Wayne's off their ranch, Dick rebels and joins the Wayne's in their fight against his father.
A champion bronc buster is hired to break horses, but winds up accused of stealing money from his boss. He has to clear his name and find the real thieves.
Purchasing the Carney Carnival and Road Show, unscrupulous sportsman Martin Trask assumes he has ownership of Rex, the world's greatest trained horse, and its rider, Margie Smith. The girl releases Rex, flees from Trask in a runaway wagon, and finds shelter with young cowboy farmer Jack Merritt, with whom she falls in love.
Jack Carter rides into Nevada and finds himself caught between a local family feud and a dangerous outlaw gang. As he earns the trust of the Watkins family, Carter must confront Luke Baldridge and fight to bring justice to a lawless town.
Old timer Hank Robbins and his young pal,"Red" Hepner ride into the town of Cajon, Mexico and find it under a reign of terror imposed by a mysterious outlaw known as El Lobo. Don Jose Valencia is also upset over the romance between his son Francisco and saloon girl Dolores. Pete Sangor, an American resident, has his eye on the girl also. "Red" and Hank discover that Sangor is El Lobo, and ride to rescue the kidnapped Francisco.
There is trouble on the Bar D ranch as cowhand Mile Ahead plans to rustle the herd. He starts a fire on the opposite side of the ranch to keep the hands busy and also kidnaps the new school teacher. Fighting the fire, Foreman Denver leans the cattle are gone and going after Mile Ahead, learns the teacher is a prisoner in the school and the fire that is now out of control is heading her way.
Rex the wonder horse's owner is murdered by Joe Regan, the leader of a band of smugglers. RCMP Sgt. Jack Gordon has been sent to capture the villain. Rex vows vengeance on Regan and helps Gordon capture him.
In the great white north, a trapper searchers for the thief who has been stealing his furs while a local trader seeks to take advantage of the situation.
In a cantina across the border, Bob Hamlin shoots a man that threatens his friend. He and his pals escape but return that night for the dance as Bob is attracted to Conchita. Running once more from the Rurales, Bob takes Conchita. They escape again only to find themselves pinned down when Buck and his gang of horse thieves attack.