Outlaws Dale and Tucson quit Wolf's gang. Just as the two are about to rob the stage, Wolf and his gang beat them to it. Dale breaks it up saving the money and this gets him appointed Sheriff. But Wolf shows up and threatening to expose Dale, forces him to let his gang rob the express office.
Halstead forces the Land Agent to alter the records and then kicks the Mexicans off their land. Buck has been sent to investigate and quickly joins up with Juan Cantova in the fight against Halstead. To keep Buck from seeing the records, Halstead has the Agent murdered. His men then claim Juan killed him and both Buck and Juan then find themselves wanted dead or alive.
Marshal Jeff sends for his friend Whit Gordon to help bring law and order to Tombstone. Bull and his gang with the help of the Sheriff and the Judge control the town. After foiling Bull's attempt to stuff the ballot boxes, newly elected Marshal Whit and his pals head to the corral for the showdown with Bull and his men.
Ore shipments are being stolen and the Rangers send Buck and his men to guard the next shipment. When that is stolen also, Buck is kicked out of the Rangers.
Heading up the Chisholm Trail with a small herd and just a few men, Breezy has his cattle rustled by Curley and his gang. Returning to Texas, Breezy convinces the ranchers to send their cattle north in one big herd guarded by a lot of men. Outnumbered, Curley has a plan to get the cattle.
Brad Buckner has just bought a ranch. Murdock keeps his rustled cattle on the ranch and sends his men to kill Buckner just as they did the previous owners. But Buckner and his men foil their attempts and decide to search the ranch. To throw Buckner off he kidnaps Buckner's girlfriend and the Sheriff and makes plans to drive the cattle across the border.
Rancher William Norton refuses to sell his cattle for half price, so saloon owner and gang leader Jim Fletcher, contrary to the orders from his secret boss Willard McGowan, the town banker, has his men rob and beat up Norton. Unknown to anyone, Marion, McGowan's adopted daughter is really the daughter of Norton, who disappeared as a young baby when she and her mother were passengers on a stagecoach held up by McGowan. Chuck Saunders, Norton's foreman, goes after the gang for robbing his boss and eventually uncovers the truth regarding Marion's heritage.
It's 1861 and Buck gets the business men of Sacramento to establish the Pony express. Hawley runs the stage line over the same route and has the U. S. mail contract. When it looks like the Pony Express will be awarded the mail contract, he gives guns to the Indians and has them attack both the riders and the stations.
The gold mine belonging to "Gun" Barlow is worked out, and Barlow attempts to buy adjacent land, with the hopes his gold vein will continue, from town postmistress Marion Saunders who, keeping a vow she made to her father on his death-bed, refuses.
Sayres and his outlaw gang operate out of a town just across the border and out of the jurisdiction of the Texas Rangers. Ranger Bob Allen is sent across the border where he poses as an outlaw hoping to lure the gang back into Texas. He gets into Sayres' gang displacing the gang boss but the disgruntled ex-boss is able to expose the hoax and Bob is made a prisoner.
Bob Allen in his starring debut gets a job on Wright's ranch where he hopes to find the rustlers no one else has been able to locate. Everyone is looking for men when the actual rustler is a horse.
The McLean and Brennan ranches are both losing cattle to rustlers and each blames the other when cattle buyer Graves is the real culprit. To throw suspicion off himself Graves hires Tim to investigate, not knowing that this will be his downfall.