Family events of summer 1962 unfold in this episode. Joanie and Chachi have a falling out over another girl. Lori Beth learns that she is pregnant. Howard dreads growing old and Marion tries to remind him that having a grandchild will make them feel young again, giving them plenty of happy memories of when their children were babies. Potsie is hired to work at Cunningham Hardware. Roger pursues a girl. Fonzie reunites with the Falcons--all of which is recorded as a montage on a home movie that Joanie sends to Richie.

Chachi has a hard time accepting the fact that his mother (Ellen Travolta) is dating. Fonzie has bitter feelings toward Potsie when he is invited to supper with the Cunninghams and he himself is not asked.

Absent: Lynda Goodfriend as Lori Beth.

Chachi suggests to Joanie that they should date other people; but with Chachi's jealousy, the idea backfires on him when Joanie makes a date with another guy at a classy restaurant. Chachi then coaxes Fonzie into visiting the restaurant with him so they can spy on Joanie and her date.

Absent: Anson Williams as Potsie Weber; Lynda Goodfriend as Lori Beth.

With Richie in the Army, Lori Beth calls on Fonzie to stand in as Richie's proxy when it is time to deliver her baby.

Absent: Anson Williams as Potsie Weber.

Fonzie and Roger date the same girl.

Absent: Anson Williams as Potsie Weber.

Fonzie fills in as a substitute teacher for Roger and inadvertently causes trouble for him by raising the issue of sex education.

Note: This episode marks the first appearance of Scott Bernstein as Melvin Belvin.

Absent: Anson Williams as Potsie Weber; Lynda Goodfriend as Lori Beth.

Jenny and Joanie end up in serious trouble when a sorority asks them to break the law and steal a statue from a local park in order to become members.

Special guest star: Phil Silvers (Cathy Silvers' father) as Mr. Piccalo, Jenny's father.

Note: Ed Peck returns in his recurring role of Officer Kirk, who busts Joanie and Jenny.

Absent: Anson Williams as Potsie Weber; Lynda Goodfriend as Lori Beth.

Fonzie has a serious relationship with a girl who has a secret—she's a nun.

Absent: Anson Williams as Potsie Weber.

Joanie babysits her new nephew when the household's heating system malfunctions.

Note: This is the only time the Belvin brothers appear together in the same episode.

Joanie and Chachi call on Fonzie to try to transform nerdy Eugene into a tough-as-nails fighter to impress Jenny.

Absent: Marion Ross as Marion Cunningham; Anson Williams as Potsie Weber; Lynda Goodfriend as Lori Beth.

Joanie is faced with the decision of what college to attend.

Fonzie and Al travel to Alabama to participate in civil rights activities with the Freedom Riders in 1962.

Absent: Anson Williams as Potsie Weber; Lynda Goodfriend as Lori Beth.

Fonzie and Chachi visit their grandmother Nussbaum (Frances Bay); but when they notice her acting abnormally, Fonzie and Chachi believe she is going senile. Worried about her living alone in that condition, Fonzie suggests that Grandma move into a retirement community, which does not sit too well with her.

Absent: Anson Williams as Potsie Weber; Al Molinaro as Al Delvecchio.

When Frankie Avalon (who portrays himself as Al's distant cousin) informs Al that he would not be able to headline the Leopard Lodge's annual Poobah Doo Dah musical due to family issues, Al persuades Fonzie to impersonate him—which turns out to be a disaster. However, Avalon does show up at the last minute and performs his signature song "Venus" to an audience of swooning girls—including Jenny, who climbs onstage and wraps her arms around Avalon's leg, reluctant to let go.

Special guest star: Frankie Avalon as himself.

Side note: In the "Venus" sequence, Avalon lip-synced his original recording of the song.

After becoming fascinated by Tchaikovsky, Fonzie tries to turn the kids on to classical music.

The gang works to give Fonzie the birthday present of his life—a face-to-face meeting with his hero, the Lone Ranger.

Note: The Lone Ranger is played by actor John Hart, who played the Masked Man from 1952 to 1953. Clayton Moore, best known as the Lone Ranger in the TV series, was prohibited from appearing due to a legal dispute with the owner of the Ranger character.

Joanie and Chachi collaborate on a song, Potsie wants to join the Leopard Lodge, and Marion gets the lead in a musical.

Absent: Lynda Goodfriend as Lori Beth.

Roger's juvenile delinquent brother Flip (Billy Warlock) comes to Milwaukee to straighten out his life.

Note: First appearance of Billy Warlock as Roger's brother Flip Phillips.

Chachi decides to give up his dreams of rock stardom and take a more practical job as a floor cleaning machine salesman. But when his first demonstration at Arnold's turns out to be a flop, Chachi reverts to his ambition as a rock star. Guest star: Danny Wells.

Jealous of the attention Joanie had been giving to her new friend Mikki (Crystal Bernard), Jenny spreads a vicious rumor that Fonzie had gotten Mikki in trouble.

Notes: Final appearance of Eugene Belvin (Denis Mandel), who coincidentally had a significant role in this episode when he bribes his crush Jenny into being his girlfriend for a month in exchange for him keeping quiet about the rumor Jenny started. This episode also marks the first appearance of Crystal Bernard as Mikki, who would return the following season to join the semi-regular cast as Joanie's cousin K.C. Cunningham. This episode marks the final regular appearance of Lynda Goodfriend as Lori Beth Cunningham.

Al seeks permission to marry Chachi's mother.

Note: This episode has two endings, one where Al and the Arcolas move to Chicago to set up the spinoff Joanie Loves Chachi; and the other, for syndication purposes, where they appear to stay in Milwaukee. This episode marks the final regular appearance of Al Molinaro as Alfred Delvecchio.

Absent: Lynda Goodfriend as Lori Beth.