An alien, Mork from Ork, comes to earth looking for someone average, or humdrum, to study and picks Richie.

Lori Beth reports that Richie isn't moving after they crash his new motorcycle.

Facing a dating slump, Fonzie suggests that Richie go to the library to meet girls. Richie meets Lori Beth Allen at the library who invites him to her dorm room.

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

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

Joanie is set to go on her first car date, so Fonzie and Richie show her how to counter any advances her date may make toward her. Joanie says she may not want to counter his advances and would like to experience her first kiss.

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.

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.

After one date with Jennifer Jerome, Potsie wants to ask her to marry him. Howard suggests that they get pinned instead, but, after asking her, Potsie suddenly backs out.

When Marion's friend is dumped by her husband for a younger woman, Marion begins to think that Howard may do the same to her.

Richie tells Chachi the story of how he met Fonzie in order to convince him that joining a gang is a mistake.

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.

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

Fonzie and Howard are picked for jury duty. The case appears cut and dry, but Fonzie isn't so sure. Meanwhile, Richie, Potsie, and Ralph practice for a fraternity festival, and Marion is to hold a paint sale at the hardware store in Howard's absence.

Howard's father comes for a visit after being forceably retired as a captain of detectives due to his age. Not wanting to sit around, he gets a job at Fonzie's garage. After one day, Fonzie, not having the heart to do it himself, asks Howard to fire his father.

Richie and Lori Beth have a fight and break up before going on a weekend trip where the band is backing up Leather and the Suedes. Meanwhile, Howard and Marion argue about women's rights.

Fonzie takes his screen test with Richie as his reading partner. The director loves Fonzie, but the studio is more impressed with Richie and offers him a contract.

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 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.

Fonzie's girlfriend is a moderately successful ballet teacher, but Fonzie has trouble accepting that she may be happier as a professional performer in New York.

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's dog, Spunky, appears depressed and distant. After a visit to the veterinarian, it is determined that Spunky's problem is mental.

Al is to receive a man-of-the-year award from the Sons of Italy, but he doesn't have a date. Fonzie sets him up with a meter maid, and she agrees to go with him to the banquet.