Marshal Caine is appointed Territorial Governor, and Deputy Foreman is appointed the new marshal, just as the government opens Oklahoma to settlement. Foreman appoints two unlikely new deputies to keep order as "Sooners" enter and make their claims. The new deputies make their claims too, but they have to deal with a shady saloon owner who takes advantage of their poor knowledge of the details of the law.
Connie Masters is being blackmailed by her outlaw ex-husband into helping him rob the bank where she works at. He tells her that only if she does will he reveal to her the whereabouts of the son she hasn't seen since he was a baby.
Chalk is pleased to meet an old friend he has known and idolized since his childhood. Foreman comes to suspect that the man may be responsible for a series of horse thefts in the area, but Chalk refuses to believe it.
An organization of hooded night riders takes advantage of the frustration of local farmers with the fall in the price of wheat, and recruit them into joining their group by telling them that a conspiracy of foreigners is responsible. Soon they begin to use whippings and fires to spread their terror.
The son of an immigrant garbage collector falls in love with the daughter of a well-to-do woman who is determined to stop them from being together. The young man has another problem in that some of his cronies are planning to swindle the girl's mother in a bogus cattle sale.
A large sum of money is left on the farm of Roly McDonough by a dying hold-up man. Roly decides to keep the money. But his attempts to use it to do good for people just leads to misery for himself and all concerned.
Three "marshals" from a Wyoming cattlemen's association come to take Foreman's wounded prisoner, who they accuse of murder. However, after they beat the prisoner in his cell, and Foreman and his deputies listen to the man's story, the lawmen decide not to turn the man over to the marshals, even though they are thus defying legal authority.
Chalk is found unconscious in a stable, with his gun fired twice, and with a dead man with two bullets in him and his gun still in his holster. Making things worse is that Chalk has no memory of what happened during the past ten hours. How can he prove himself innocent?
Through his considerable oratorical skills and vast charisma, a blind man is able to convince the people of Stillwater that he is the one to stop the greedy land syndicator who is exploiting them. Soon he maneuvers them into having him run for mayor, but he really plans to use this as leverage to achieve his own more selfish goals.
A Minnesota farm girl arrives in Stillwater, planning to marry her childhood crush, Sven Johanssen. But the wild and free-living Sven has no intention of settling down, and he is involved in a dangerous enterprise, hijacking shipments of whiskey that a crooked saloon owner is selling to the Indians.
Chalk's father arrives in Stillwater, which unnerves Chalk a bit because the old man has a long history of swindling and con games. He tells Chalk he is going to turn over a new leaf, but very quickly becomes involved with two other men in a stock swindle.
Foreman and Chalk team with sheriff Ned Danvers in the hunt for an outlaw. For Danvers, it's especially important, as his upcoming reelection depends on him capturing the outlaw, and his opponent in the race is trying to capture the man with less concern for how many are killed in the process.
Before the town's big horse race, Slim trades six horses to two Pawnees in return for a wild Appaloosa who he later learns will throw any rider who is not Pawnee. A dishonest gambler hopes to sabotage the race so that he takes most of the money, and feels the wild horse fits nicely into his plans. But Slim plans to ride the horse anyway.
Connie takes charge of two tomboyish sisters who tried to deposit $12,000 in the bank shortly after it was robbed and a teller killed. Certain that their father is the one who robbed the bank and sent the girls to deposit the money, Foreman plans to wait until he comes to town to reclaim them and take the cash out. But things go differently than planned.
Two brothers from Cuba plan to assassinate the hated Spanish ambassador when he comes through Stillwater, even though he will be heavily guarded by the U.S. government, and knowing they will be killed in the process.
A con man arrives in Stillwater with a horseless carriage, and a plan to fleece the town by getting them to invest in a factory. Meanwhile, the new mode of travel gives a bank robber an idea for how make his getaway.
To pursue a wanted outlaw, Chalk unwisely enters No Man's Land, a lawless area in no state's jurisdiction. He is soon wounded and forced to flee, encountering only an immigrant peddler and his son who fear getting involved in anyone else's affairs. Foreman and Slim search for Chalk, but the unofficial boss of No Man's Land puts out a bounty on him, to send a message that no lawman will leave the area alive.
The Edendale bank is robbed just as Thomas Healy's entertainment troupe is performing, and Healy loses &20,000 that he had invested in it. But it gives him an idea to make up his losses by having the troupe rob the Stillwater bank just as they are performing there and letting the crime be blamed on the Edendale robbers. That plan is thwarted when Foreman captures the Edendale robbers and recovers the money. Healy decides to abandon his plan, but another member of his troupe does not. Also, the troupe talks Chalk, who is growing close to Healy's daughter, into joining ...
In the pilot episode for an unsold series ("Outpost"), Sergeant Ben Thompson, while in jail for disorderly conduct, tells Foreman and Chalk the story of how he and two other demoted Army sergeants pursued a group of Indians who had acquired and learned to use a Gatling gun, and how their pursuit led them to a cave believed to hold ancient treasure from a Spanish expedition.
Foreman receives word that a paroled outlaw plans to come to Stillwater to kill him. But the marshal is frustrated in his efforts to be on guard for the man, because he has to deal with so many other complaints from townspeople over less serious matters. Plus, a man arrives in town and claims to be a deputy sent to help, but his attitude makes everyone suspicious of him.