Sam Drucker calls the law when he finds $300 is missing from his safe. With the investigation pointing only to Frank Nitti, Eb is finally charged. He shows up in a car he paid $300 for, but can't recall who gave him the money to buy it.
A young runaway turns up in the Douglas' barn but refuses tell them his real name. After Oliver reports the child to the police, the boy goes on the lam. When encountering other Hooterville residents, his aliases include Oliver Wendell Douglas, Jr., Fred Ziffel, Jr. Hank Kimball, Jr. and Sam Drucker, Jr.
Boy genius Dilly Watkins improves life on the Douglas' farm with his new electronic inventions. Besides the barn door opener that works when Eleanor moos at it, there's the television camera that sends pictures of the cow to the bedroom set. Oliver doesn't realize the camera is transmitting to all the sets in the valley, turning him into an overnight Nielsen sensation.
Arnold is opening an account at the Pixley Bank when two robbers make off with a bundle of cash and the pig's five dollars. The pair hides out at the Douglas' farm, taking Lisa, Oliver and Eb hostage. Arnold runs off with their bag of loot and takes it to the authorities while the clueless criminals force Lisa to make hotcakes for them.
The farmers of Hooterville sign up for a government-sponsored agriculture exchange program to Europe. When they realize the $300 cost for tickets is per person, not per plane-load, they decide to supply their own airplane and fly themselves over. Since Oliver flew in the war, they draft him to be their pilot. The FAA puts a stop to their cockamamie plans.
On learning that Lisa's mother is coming for a visit, the Hooterville residents go overboard in wanting to welcome the countess. Despite Oliver's protests that she's not royalty, they forge ahead anyway with plans for a parade and marching band.
Everyone in Hooterville, except Oliver, is overcome with spring fever; even Sam Drucker is wearing his spring toupee. Deciding to revive the Hooterville spring festival, Lisa visits the neighbors to drum up support. Meanwhile, Oliver tries to do his planting with Eb who can't understand how to work the automatic planter.
Eb's latest career choice is that of a barber. He talks Oliver into paying his tuition to MIT, a mail-order barber college. Eb's sent a dummy head and hair to practice on and receives his grades by mailing the trimmed toupees back to the school. Lisa is excited about Eb's education while Oliver is irritated by all the hidden costs he keeps being asked to pay.
Lisa's long-awaited vacation to New York is not what she'd hoped for. She's none to thrilled hearing about Oliver's womanizing playboy days or all the wild parties they're invited to. When Oliver's offered a job with his old law firm, he's the Douglas who's tempted by the excitement of city life.
The Hungarian man who saved the life of Lisa's uncle moves in, seeking repayment for his good deed. Lisa feels an obligation to help Lazlo, but Oliver is simply irritated by his constant money-grubbing. Oliver's also unfazed by Lazlo's threats to cast a Hungarian curse on him.
It's planting season in Hooterville, but Oliver doesn't know what to grow. After testing the soil, he discovers Hooterville is perfect for growing rutabagas. The locals are overcome with rutabaga fever, going so far as to plan a "Rutabaga Bowl". To spread the word, Lisa is sent up in a hot air balloon to drop vegetables on people with the message "Eat Hooterville Rutabagas" written on them.
At Sam Drucker's store, Oliver and Lisa meet their new neighbor who's about to go into labor. After racing her to the hospital, Oliver arrives home to find Lisa's volunteered to keep the woman's four other children in their home. Oliver's nerves become frayed when he's forced to sleep in the barn with the boys and spend all day carrying the kids to and from school.
Arnold's performance as a British police dog in the Hooterville theater production of "Who"--the marquee wasn't big enough for "Who Killed Jock Robin?"--turns him into an overnight star. Lisa is so impressed, she arranges for an old friend to give him a Hollywood screen test. After the locals stage a telethon to raise money for the trip, the Douglases are soon escorting the hammy actor West for his big showbiz break.
Oliver and Lisa chaperon Arnold to Hollywood for his screen test. Producer Boris Fedor isn't interested in the pig; he's just using him to pressure a greedy horse to come back to work. When the horse's agent balks, the publicity machine starts promoting Arnold as the studio's next big star. A stunned Oliver, who came along for laughs, can't believe what he's witnessing.
Peterson's Poi Juice is giving away a trip to Hawaii and Arnold Ziffel is chosen as the winner. When the ad agency rep meets Arnold and discovers he's not a human, he tries to disqualify the swine. Famous "pig lawyer" Oliver Douglas, as he's repeatedly referred to, is retained to fight for Arnold's winnings.
The Douglases are asked to donate old clothing to a charity rummage sale. Lisa is glad to give away Oliver's entire wardrobe, but can't part with any of her dresses. Each has a memory attached, leading to flashbacks of Oliver asking Lisa's father for her hand in marriage, the Douglases' honeymoon in Switzerland and their first party in their new Park Avenue apartment.
Fire Chief Joe Carson appoints Oliver as his assistant, assuming he'll pay for his trip to a Miami convention. Instead, Oliver's complaints about how the Hooterville Fire Department is inept and unprepared result in Carson being booted and himself being named chief. Not wanting the job or the grief he's getting for supposedly stabbing Uncle Joe in the back, Oliver finds a way to get himself canned--fining everyone in the valley for fire code violations.
Eb announces his engagement to Loreli Appleby, a girl he met the day before. In an attempt to impress his future father-in-law, Eb succeeds in destroying the farmer's cabbage crop. To get back in the man's good graces, Eb pawns Oliver's cow Eleanor so he can make the Appleby's mortgage payment.
Fed up with the lousy condition of the highway through Hooterville, Oliver launches an attack on their beloved state district representative, Ben Hanks. Oliver runs into a brick wall with the locals because Ben bribes them with expensive gifts; he even has a catalog for them to choose their "gifts" from. The folksy, guitar-playing politician proves too wily for Oliver, even after being caught padding the state payroll with relatives.
Wanting to be a bigger help to Oliver, Lisa decides to learn carpentry. She buys overalls and begins to study the craft from the inept Monroe brothers. Lisa's talents result in destruction in Monroes' workshop and earns Oliver a punch in the nose.
Oliver plans to leave Eleanor with Mr. Cowan's bull Dudley so she'll birth a calf and start giving milk again. Lisa complicates matters when she wants to make sure Eleanor has a good "husband" with bright prospects. No bull Lisa meets seems good enough to marry her "daughter."
It's "Old Mail Day" as Sam Drucker hands out letters that have gotten misplaced in his post office. He deliver one letter that dates back to 1917. Having learned nothing from his previous letter-writing fiascoes, an upset Oliver complains to the Postmaster General for delivery service. The locals soon turn on Oliver because Drucker's General Store is never open; his letter got the Hooterville post office reclassified and now Sam's always on his bicycle delivering mail.
The Agricultural Department is sending a student to learn the ropes from agent Hank Kimball. No one's too interested until Terry turns out to be an attractive blonde co-ed. All the men of Hooterville, eligible and otherwise, fall over themselves flirting and fawning. On the night of the big barn dance, the Douglas living room is packed full of maneuvering men, each thinking they're her date for the evening. Terry's choice turns out to be none of the above.
After Joe Carson quits as head of the Hooterville centennial celebration, Oliver gets the job. His idea is to stage a re-enactment of the town's founding starring himself and Lisa as Horace and Doris Hooter. In the dramatization, saloon girl Doris fleeces Horace out of the money he'd hoped to buy a farm with. Eventually, he gets his money back, thanks to her skills as a card shark, and they marry and settle Hooterville.
Lisa's convinced that Hungarian gypsies have placed a curse on her when she receives a dreaded blue feather in the mail. To "de-hexify" her, Haney sells Lisa a ridiculous recipe that she mixes up, places in a green purse, and hangs outside the front door. Eb gets a look at it and panics because the "green purse hex" will bring a drought. He counteracts it with his own concoction in a yellow purse. Oliver takes action to put a stop to all this foolishness.
After Oliver orders the Monroe brothers to finish work on the bedroom, they confess that they never got a building permit. Oliver storms off to get one himself, only to discover his barn is in Hooterville, but his house is in Pixley. Haney, who sold them the farm, offers to hook a rope to the house and pull it to Hooterville with his truck. Meanwhile, the locals turn on Oliver for having "moved" to Pixley. Fed up, he has the farm re-surveyed and gets even worse news.