Fonzie reunites with an old flame, Pinky Tuscadero, who is in town to perform motorcycle stunts at a demolition derby.

Fonzie assesses the damage to Pinky's car, and Richie asks Howard to delay the start of the demolition derby.

Though he's up against the two Mallachi brothers by himself, Fonzie is able to win the demolition derby. While waiting at the hospital for Pinky to be released, Fonzie tells Richie that he loves her and wants to marry her.

After having been in several fights recently, on the advice of the Cunninghams, Fonzie agrees to see a psychologist.

Fonzie's friend's pregnant wife stays with Richie at the Cunningham house while the rest of the family is away on vacation.

Potsie saves Fonzie from a fire at the garage. Out of gratitude, Fonzie grants Potsie any one favor, and Potsie wants to pal around with the Fonz.

To allow Richie to have a night alone with his girl, Fonzie allows him to use his apartment and claim it as his own. Fonzie needs some rest, so he sleeps in Richie's bed without Howard, Marion, and Joanie knowing.

Joanie enlists Fonzie to be her partner for a marathon dance at Arnold's. She desperately wants to outlast cheerleading captain Jill Higgins who had cut Joanie from the squad earlier. Prior to the dance, however, Fonzie's motorcycle breaks down, and he is forced to push it for 12 miles.

Richie, wanting to become a tough reporter, sets out to investigate the food at Jefferson High. During his investigation, he discovers that Fonzie is afraid of liver.

Kirk, the new acting sheriff, tries to exert his power by forcing Fonzie to leave town.

Fonzie meets an older woman whose car he fixed and agrees to meet her the next day for doubles tennis at a country club.

Richie and the guys organize a time capsule for a school project. Howard agrees to let them use the vault at his store for the capsule, and Potsie accidentally locks them all inside.

To get some publicity, Al tries to have someone break a world record at Arnold's. Meanwhile, Fonzie's cousin, Angie, is in town for a visit and proves to be extremely clumsy.

Richie makes a lucky shot to win a basketball game and suddenly becomes a big hero.

Not having enough to do now that Richie and Joanie are growing up and because she feels as though she's a slave to Howard, Marion gets a job waitressing at Arnold's.

The guys discover that Fonzie has been going to night school so that he can graduate with them. Marion gave them this information, and she becomes worried that Fonzie will be angry with her for telling.

After passing make-up health exams and getting permission for Fonzie to participate, the guys arrange for aspects of the graduation ceremony to be sped up in order to accomodate the inclusion of Fonzie's speech.

Thinking her life is dull and that she's always treated like a little kid, Joanie wants to join the Red Devils' gang.

Howard comes up with the idea for a trash compactor, and Fonzie becomes his partner to help him build it. They become very excited about the success they could achieve and present "The Gulper" to a corporation for consideration.

Fonzie gets a dog, and she escapes when Ralph and Potsie accidentally leave the gate open. Ralph tells Fonzie that the dog, Spunky, was stolen.

Ralph takes bets on football games at 10:1 odds. The Green Bay Packers pull out an unexpected win, and Ralph owes a lot of people a lot of money.

After crashing in a stock-car race, Fonzie begins to worry about what will happen when his number comes up. Al suggests Fonzie seek the guidance of his brother, Father Anthony Delvecchio.

A Hollywood talent scout, needing a mechanic for his limousine, sees Fonzie at Arnold's and thinks he could be the next James Dean. The Cunninghams, Potsie, and Ralph go to Hollywood with Fonzie for his screen test.

Fonzie faces jumping a caged shark on water skis, and Richie decides whether or not he wants to sign the Paramount Pictures contract he was offered.

After Chachi is caught by a truant officer, Fonzie and Richie arrange for Joanie to tutor him. He gets caught cheating on a test and, as a result, gets suspended from school and gets in hot water with Fonzie.

Fonzie has to have his tonsils removed and will miss a big Halloween party.

Richie, Potsie, and Ralph get an apartment of their own.

Pinky Tuscadero's younger sister, Leather, comes to Milwaukee looking for a gig. Al gives her and her group a job at Arnold's after a successful audtion, but Officer Kirk threatens to shut the place down after learning of Leather's troubled past.

After Howard refuses to let Joanie go on tour with Leather, she follows through with her threat to run away from home.

Fonzie is invited to a socialite dinner party, but the people who invite him do so thinking Fonzie will make a fool of himself.

Richie, Potsie, and Ralph want to join the best fraternity on campus, but they have to survive ""Hell Week"" first.

Ralph is caught with the girl of the football team's star fullback, Rebel E. Lee. Instead of a fight, Fonzie arranges a boxing match between Rebel and Ralph to settle their dispute.

After getting a ""D"" on a paper for his investigative reporting class, Richie decides to do a story about the corrupt sanitation department that is forcing Howard to pay a weekly surcharge.

Fonzie is the best man at the wedding of an old pal, but the bride-to-be stops the ceremony after spotting Fonzie. Meanwhile, K. C. awaits word about a part in the school musical.

After deciding to quit the band, Joanie moves back in with Howard and Marion to enroll in a teaching program at the University of Wisconsin. Chachi tries to convince her to stay with him in Chicago after he isn't willing to go with her back to Milwaukee.

Fonzie's adoption request is reconsidered after a stern talk by Howard to the adoptions administrator.

Meanwhile, Joanie and Chachi continue to prepare for their wedding.