Having sold her home, Fred's antagonistic mother-in-law arrives at the Flintstone cave, and Fred tries to play cupid after meeting a rich Texan who is looking for an elderly wife. He invites the man home for dinner, but Wilma becomes suspicious of the would-be suitor.
Ozzie and Harriet become lonely when they don't hear from David and June.
When a long-time employee retires with little in the way of thanks, the man decides to rob the company and run off with his secret girlfriend. His wife, however, has other plans.
With the town jail full, Andy reluctantly decides to have the town drunk, Otis Campbell, incarcerated in Andy's own home. But when Aunt Bee takes charge as the "warden," Otis is soon howling to be locked up in the real jail!
Mark is shocked when he discovers that his father is a poker player.
Ben supports the appointment of Asa Moran as Virginia City's temporary sheriff, but Moran goes overboard with his authority, jailing Adam in the process and pistol-whipping a Ponderosa hand.
Oren was a rancher who liked his drink, gambling and women, even though he had a pretty wife at home. Matt is forced to kill him and when he breaks the news to her, all she can see is getting revenge for his death, and Matt is her target.
Old Ben, who is able to transform himself into anything, tries to help a crippled little girl.
Fred and Barney encounter the penniless J. Montague Gypsum, who is threatening to jump from a bridge. Fred takes the man home and learns too late how responsible he is for the life he saved.
Fraternity brother Wally confesses to Ricky that he can't afford a fancy dinner at a plush restaurant.
March 3, 1932. It's the great train robbery, on the southbound express headed for Chicago. The Stryker brothers steal mail sacks containing 750 grand in payroll money. During the robbery, a baggage man and Lippy Carson (an associate of the Stryker brothers, who had worked as a mail clerk) are killed, and thrown from the speeding train. Since mail robbery is a federal offense, Eliot Ness and his Untouchables are called in.
A group of young thieves hit on the idea of robbing a wealthy man by one of them volunteering to babysit. However, when robbing the premises, the man returns home, leading to murder and revenge.
Weaver's Department Store in Mayberry has some new competition -- in the form of Bert Miller, a traveling salesman who sets up shop in the town with a little help from Andy.
Mark learns that the prisoner Micah is escorting to the gallows is the man that saved his life three years previously.
Bart, waiting to collect on a $10,000 IOU, makes an uncomfortable observation: murder may be the pay-off in a gambler's life.
In order to keep peace on the ranch, Hoss and Joe try to help ranch hand, Hank Meyers woo the the plain-looking schoolteacher, Abigail Jones. When their first plan backfires, they convince Adam (who doesn't want to get involved) to help and this makes things worse because Abigail believes it is Adam who is wooing her and Hank Meyers believes Adam wants to steal her away.
While returning suspected killer Pruit Dover to Dodge to stand trial, Matt is shot and badly wounded, and yet Dover stays with him and nurses him back to health.
Mike Preston is a bitter man who despises Hugh Jamison because he mistakenly believes Jamison stole $100,000 from him and is responsible for him being crippled. Trying to entrap Jamison, Preston makes a mistake and is set up for murder by the real thief.
Once more, Fred forgets the anniversary of the night he proposed to Wilma. After being chastised by Wilma, he agrees to take her on a date to the movies, but she wants to go on the same night he is supposed to be captaining his bowling team in the bowling alley, Fred tries to do both.