Gomez's brother, Pancho, is staying with the Family while Gomez goes to a lodge meeting in Tombstone, Arizona. Gomez is jealous of his brother, who once courted Morticia. Halloween is nigh, and Pancho tells the legend of Cousin Shy, who distributes gifts and carves pumpkins. Actually, Gomez has been lured off by crooks, who have bugged the house in order to steal the Family fortune. Lafferty, the boss, sends Mikey to investigate. Wednesday (Senior) is home from music academy, where she studied the piccolo (she breaks glass with it). Pugsley (Senior) is home from Nairobi medical school, where he's training to be a witch doctor. Mikey panics and flees after treading on Kitty Kat's tail. The crooks have a fake Gomez and Morticia to help in their plans, along with two strong-arm goons, Hercules and Atlas. Gomez returns home for the Halloween party and trimming the scarecrow.
Lafferty poses as Quincy Addams (from Boston) to get in. He has his men tie up Gomez and Morticia and his doubles take their places, confusing Pancho, who' s still got the hots for Morticia. Lurch scares off the thugs and terrifies the assistant crook. Fester, trying to be nice, puts Lafferty on the rack. Lafferty tries to escape through the secret passage and steps on Kitty Kat's tail. When the police arrive, they surrender. The Family is then free to celebrate Halloween happily.
Gomez has written a play for Wednesday's birthday and hires a director in hopes of rekindling his career. After Fester, upset that Cousin Itt got the lead role, locks him in his room in order to play the role himself.
It's Gomez and Morticia's 13th wedding anniversary and they tell the children the story of how they got together instead of him marrying her sister Ophelia.
Princess Millicent von Schlepp and her aide Lady Fingers comes for a visit to the Addams home. Not being able to accept her many demands, she's moved to a hotel but Thing is depressed after Lady Fingers is fired by Millicent. After returning with her new aide Esmeralda, Millie accuses Thing of stealing her missing bracelets.
After receiving his new tax bill, Gomez is convinced the Mayor is incompetent and decides to run for the office himself. After a debate it's Gomez's honesty that nearly gets him elected until a technicality has him disqualified.
It's Uncle Fester and his chemistry project to the rescue after cousin Itt starts losing his hair... and his charmingly good looks.
When an unthinking neighbor tells Wednesday that witches don't exist, Morticia and Gomez resolve to hold a séance and summon a witch's spirit to prove to their daughter that witches do exist. Unfortunately, all of the ghostly spirits are busy on Halloween so Grandmama convinces Lurch to help her fool her family so that Wednesday isn't disappointed.
Mortica is appalled after the kids tell her that the books in school portray witches and dragons as evil. After deciding to write her own stories, Gomez gets worried that she has become consumed and is losing her to the writing. Gomez convinces Fester to change the stories before sending them to the publisher but he instead thinks she is brilliant.
Morticia takes up sculpting, but after 3 weeks no one is impressed by her work. So Gomez hires Sam Picasso to find a buyer for her great artwork.
Pugsley copies an old love letter from Gomez to give to his teacher. But after a visit to the Addams home she is convinced Gomez wrote it and not Pugsley.
Abigail Addams has arrived in town to remove Gomez as head of the family fortune. Mrs. Courtney would like to meet her while she is around and encourages her son Robespierre to get to know Wednesday, who she believes is Abigail's daughter. Wednesday already likes Robespierre and asks for advice in getting his attention.
After reading Robin Hood, Gomez becomes a burglar while sleepwalking and stores the loot in the storeroom.
Morticia gets Gomez to learn to drive just so he can get his picture taken by a photographer who once took a great picture of him. But he now works as the department of motor vehicles photographer.
An old family friend Don Xavier Francisco de la Mancha Molines is coming to visit. His daughter Consuela is getting married and assumes Gomez is the groom. After seeing his lifestyle he's afraid Gomez is building a harem.
Morticia pretends to be the mother of Diana the bearded lady, a pen pal of Fester's, after he proposes to her through the mail.
Grandmama and Fester move out of the mansion after Morticia and Gomez accuses them of spoiling the children.
Morticia is worried after seeing Fester exercising with a TV fitness guru. He's attempting to get fit after hearing that his pen pal friend, Fifi, is coming for a visit. After accidentally hypnotizing himself, he reveals that he's trying to become an astronaut.
The Family discovers Great-Grandfather Pegleg's old sea chest, complete with a treasure map. The hunt is on to find the hidden booty.
Ophelia meets Horatio Bartholomew at a Lonely Hearts' Club, and Grandma Frump objects to him. Morticia and Gomez also believe he's a phony and tries to convince her to marry Cousin Itt.
Pugsley wants to work so after trying out a few different jobs with no success he tries cutting hedges. After cutting them into evil monsters, a neighbor threatens to sue the Addams'.
It's grandma Frump's birthday and the Addams family plan to send her to a beauty spa as a present. Pugsley mistakingly tells her that they are sending her to Gomez's new retirement home.
Morticia decides to become a decorator and Gomez tries to woo in the new neighbors the Digby's as her first client by investing a million dollars of insurance in Digby's company.
Kitty Cat is sick and the witch doctor refuses to do a house call. After finding a veterinarian to take a look at Kitty he soon loses his nerve . The family tries boosting his confidence by curing each one of them first.
Feeling Lurch is overworked Gomez builds Smiley the robot as an assistant for him. Soon Lurch feels jealous and unwanted of his mechanical counterpart.
Fester accidentally burns up the families stuffed polar bear and wants the insurance company to replace it. Having thought he had canceled their policy, Mr. Digby gets fired by the company. Hearing this, Gomez decides to open his own insurance company.
Lurch falls in love with Morticia's old school friend but is painfully shy around women. Gomez and Fester try to give him advice to overcome his shyness.
Ophelia arrives with boyfriend troubles again so Morticia helps her forget by taking up singing. Gomez hires Signor Bellini to give her lessons and sets up an audition with opera star Signor Rudophio.