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.
A ranch foreman is assigned to escort his employer's daughter from the big city back to the ranch. The girl is carrying the valuable Regent diamond and the pair become the target of a gang of thieves.
Jack Hoxie pledges to take care of a prospector's son before the man dies from shooting wounds. Jack Hoxie must find the killer before he disappears with the prospector's gold. A young woman also searches the killer for motives of her own.
One of John Waters' two Tim McCoy westerns made with MGM in the last years of the silent era. A print is preserved at the George Eastman House in New York but it hasn't been made available to the public and there don't seem to be any plans for it.
During the darkest hour of the American Civil War, the Union desperately needs gold to keep its armies in the field and its credit good. Federal Agent Bob Scott is therefore instructed to clean out the bandit gangs that have been stopping the vital California gold shipments.
After "Dirty Neck" Jack Purvin sees a newspaper photograph of Eastern socialite Helen Van Smythe, soon to arrive at the nearby dude ranch, he hightails it to San Francisco in order to learn how to become a gentleman. Returning to the ranch, the new but not necessarily improved Jack shreds his dandified image in order to save Helen from a lecherous but decidedly fake count and her mother from a jewel thief.