Joanie doesn't feel comfortable with the way that Chachi is talking to several girls at Al and Louisa's new restaurant in Chicago after finishing a performance there.
Joanie decides to go to a nephew's birthday party instead of singing with the band after she feels that Chachi has a bad attitude leaving the band in a tight position.
When Joanie plays matchmaker for Annette and a new guy named Wendell, people think that they might be rushing into things when they plan on getting married after only knowing each other for three weeks.
Chachi becomes upset when Joanie gets the band a gig at a fraternity party because he thinks that their band is better than that. Meanwhile, Al starts working hard to get back into shape.
Fonzie visits while the band is auditioning to win a guest spot on Twist Fever. Meanwhile, Al regrets not being more of a father figure for Chachi.
After Chachi answers the phone at Joanie's apartment, Howard and Marion come to check things out. The situation is only made worse because when they show up, Chachi is there in a bathrobe.
Joanie and one of her friends challenge Chachi to a little one-on-one game of basketball after he says that men are naturally better than women at that sport. Meanwhile, Al faces the possibility of being investigated for tax invasion.
While spying on Joanie when she's out for coffee with her art teacher, Chachi has to pretend that he's the nude model for the art class in order to keep from being spotted by Joanie. Meanwhile, Al repeatedly tries to become a member of the Chicago Leopard Lodge.
A record producer, Vanessa, who is also an old friend of Louisa's, comes to town and asks Chachi's band to play for her, but other people begin to believe that she may be interested in Chachi for more than just his music.
Joanie believes that she saw Paul McCartney at the hospital while going there to see a friend. Meanwhile at the Leopard Lodge, Al gets promoted to "Savage."
Even after Al and Louisa protest against Joanie and Chachi going to see an exotic French movie, they go anyway and try to leave when Al and Louisa show up to watch it with them.
Al and Louisa fire Chachi's band after warning them about showing up late and they don't take the warning seriously.
Mario destroys Joanie's thirty page history report on accident by sitting it on the stove and it catches fire. Meanwhile, Al can't find the right words to tell Louisa that the couch she bought is extremely ugly.
Joanie dreams about herself later in life and Chachi leaving her for another woman that can cook. When she wakes up, she tries to find someone that can teach her how to cook so that she can make the perfect meal for Chachi.
Chachi's band's van gets stuck in the snow after they pick up a hitchhiker on their way to play for the local radio station's Christmas Eve special on Christmas Eve night.
When Joanie's first love rolls into town, Chachi becomes concerned that Joanie might leave him.
Joanie and Chachi finally decide to elope after taking notice about how much that Louisa's aunt and uncle are still in love after fifty years of marriage.