Joanie and Chachi sneak off without permission to a Beach Boys concert in Chicago, but they get in over their heads when Chachi's car breaks down and they get stuck in a motel together.

Fonzie becomes a shop teacher at Jefferson High School and has to adjust to being an authority figure. He also experiments with growing a beard.

Richie's cousin Roger Phillips moves in and takes a teaching job at Jefferson High School alongside Fonzie.

Tired of being a pedestrian on dates, Joanie disobeys Howard and buys a car of her own, only to find out that hiding a car is too difficult to handle.

Fonzie and another teacher compete for "Teacher of the Year."

Note: First appearance of Kevin Sullivan as Tommy.

After twenty years, Al reunites with his great lost love.

After a day of granting favors for his friends, an exhausted Fonzie falls asleep watching a horror movie and dreams that a mad scientist ( Dick Gautier) has stolen his cool.

Chachi flies into a jealous rage when he sees Joanie kissing her co-star in the school play, leading to a falling out between them.

Guest Star: Larry Anderson.

Joanie asks Fonzie to be Jenny's date for a masquerade ball held on a ship, where they dress as a bride and groom. But after staging a mock wedding ceremony out at sea with the ship's captain dressed as a priest, the couple learns they may actually be married. Love-starved as always, Jenny takes advantage of the situation religiously, and moves into Fonzie's apartment and redecorates it to her liking. However, Jenny is later disappointed when proof is presented that she and Fonzie aren't married after all.

Ashamed of his eccentric family and being poor, Chachi is reluctant to invite Joanie over to meet his mother. Because of this, Joanie begins to think he is ashamed of her; so Fonzie comes to the rescue: He invites the Cunninghams to get together for dinner at the Arcolas' home with Chachi's mother.

Note: Ellen Travolta as Louisa Arcola, who would reprise the role on Joanie Loves Chachi.

In a Rashomon takeoff, when Fonzie is injured (shot in the buttocks) during a camping trip (presumably, by Potsie), everyone tells a different version of what happened.

After falling behind on rent, Potsie is forced to move back in with his parents. When he learns that Lori Beth's roommate likes men who live alone; Potsie remains in the apartment, but he doesn't reveal to Fonzie how he is earning quick cash to pay his rent.

Fonzie takes his auto shop students on a field trip and, during a stop at a diner, he encounters a waitress ( Janis Paige) whom he believes may be his long-lost mother.