The gang organizes a surprise party for Howard and Marion's 20th anniversary as clips from previous episodes are shown.
Mork returns to 1950s Milwaukee to learn about relationships in this retrospective episode.
Richie buys tickets to a rock and roll show from Fonzie but has to work at the hardware store when Howard needs to have his tonsils removed. Because he'll be working until 9:00 PM, he won't be able to go to the show, so he asks Fonzie for a refund. Later, Howard tells Richie that he can close the store at 5:00 PM leaving him free to go to the show. He, now, has to ask Fonzie for the tickets back.
Howard secures a gig for Richie, Potsie, Ralph, and Bag to play at the Leopard Lodge dance. Fonzie is able to get the guys tuxedos, but, in return, he joins them as a member of the band. When Fonzie plays a loud bongo solo during a slow dance, Richie is chosen to give him the news that he's out of the band.
Fonzie asks Richie to watch after his girl, Denise, while he's out of town at a demolition derby. Denise, upon hearing what Fonzie's asked Richie to do, decides to test Richie's trustworthiness. Richie succumbs to temptation and makes out with Denise at Inspiriation Point, but he later finds out that she has mononucleosis.
Because the high school was vandalized, Officer Kirk imposes a curfew. Richie suggests that they demonstrate against the curfew, get arrested, and fight it in the courts. While Richie, Potsie, and Ralph are in the restroom at Arnold's discussing their plans, the lights go out, and they discover they are locked inside after Arnold closes up for the night.
Marion, tired of the monotony of everyday house chores, decides to enter a televised dance contest. When Howard won't participate with her, she secretly enlists the help of Fonzie. Arnold unwittingly tells Howard that Marion has been at Arnold's early in the morning with another man, and Howard becomes suspicious.
Richie temporarily takes over a local newspaper's advice column but only tells Fonzie about it. Potsie and Ralph, in an attempt to solve their continuous bickering problem, write in to Richie's column. Richie, via the column, suggests they literally draw a line down the center of the room and for Ralph to stay on one side and Potsie on the other.
It's their 23rd anniversary, and Howard and Marion are angry at each other over a rate-your-mate test they took in a magazine. Richie, Fonzie, and Joanie have arranged for them to take a second honeymoon. Marion angers Howard even further when she wants everything to be exactly the same as it was on their first honeymoon.
Richie is chosen the 1961 Delta Gamma King and acts like a jerk after receiving the honor. However, nobody knows that the reason he acts the way he does is a result of someone slipping a pill into his ginger ale. The next day, everyone is angry with Richie, but he is confused because he doesn't remember anything that happened after being crowned king.
Unknowingly, Richie, Potsie, and Ralph are invited to a party hosted by the She Devils gang in which the Devil who brings in the biggest nerd wins a $100 prize. After Richie discovers the purpose of the party, he and the guys head for the door. However, several Devils come in carrying a sack containing a guy who jilted the sister of the gang's leader. The guy is Chachi.
Lori Beth receives a letter from Richie in which he proposes marriage. She has to go to Greenland for the wedding, but doesn't have the money to make the trip. Marion goes on a show called Dreams Can Come True in which three women tell their stories of tragedy. The winner has their dream come true, and Marion hopes she can win the money for Lori Beth.
Chachi tells Fonzie that his motorcycle has seen better days, but Fonzie refuses to junk it. He finally decides to get a new bike after crashing his old one but has to save his money a little longer. Joanie suggests to Chachi that they all pool their money with Fonzie's to surprise him with a new bike for his birthday. Meanwhile, Arnold's has a new cook, but Fonzie's sixth sense tells him that something isn't right about him.
After Jenny's date dumps her before a big masquerade ball, Fonzie agrees to take her. They dress as a bride and groom and, as part of a talent portion of the party, have a make-believe wedding. However, since the captain of the boat performed the ceremony, the marriage may be legal. Roger believes they can get the marriage annulled if Jenny agrees to it, but, instead, she comes into Fonzie's apartment carrying suitcases.
Desperate to get Chachi on the school's basketball team, a scout for Eastern Florida University offers him a scholarship and several other superfluous perks - including a cheerleading scholarship for Joanie. Fonzie is extrememly excited for Chachi, but Howard and Roger think the scholarships are too good to be true.
Marion hurts her back before a big bowling game, but Howard finds a new partner in the lovely Fern Flagg. He had told Marion that she was an old spinster woman. Marion and Fern meet each other, and Marion is furious at Howard for lying to her about Fern's appearance. Meanwhile, Jenny receives a product in the mail called the Ajax Bust Builder.
Joanie prepares some home movies to send to Richie. She mentions that she and Chachi have had their problems over the summer. In the movies, Lori Beth announces that she's going to have a baby, Al's mother visits for the entire summer, Howard is consumed with Braves baseball, and Fonzie and his former gang, the Falcons, get ready to settle old scores with a rival gang.
After seeing reports on television, Al feels compelled to visit the South to take part in an upcoming freedom march. Fonzie, concerned for his friend's well-being, decides to go with him. Meanwhile, the Cunningham's television set is broken, and, while it is away being repaired, Howard suffers withdrawal symptoms.
Initially furious that the music teacher, Cynthia Brannigan, hires the Boston Conservatory Orchestra for the annual Jefferson High concert, Fonzie changes his tune when he realizes that famous composer Tchaikovsky was very much like himself. Fonzie decides to get the entire Jefferson High gang to like classical music.
After a day of fishing with Howard, Chachi gets to thinking about his future when he realizes that being a success in the music business is a long shot. He leaves the house determined not to come back until he finds a career that would be sufficient to support Joanie should they get married one day. He tries his luck at being a salesman.
Roger tries to convince Flip to stop drinking and hanging out with guys that do. Flip doesn't take his advice, and he and his friends accidentally hit Heather with their car. Meanwhile, Fonzie auditions barbers to replace his who recently died. Also, Jenny, K. C., Bobby, and Melvin are in charge of decorations for the Winter Carnival.
Fonzie and Roger miss their flight to Minneapolis for a teacher's convention, so they agree to go with Potsie's uncle, Omar, who has a small plane he uses for crop dusting and spreading ashes. Omar jumps out when there is trouble with the engine leaving Fonzie and Roger by themselves with no parachutes.
In an attempt to help Fonzie move on after his break-up with Ashley, Potsie, Chachi, and Roger take him on a retreat to a singles resort. However, to get him to go, they tell him they're going to a sporting camp. When they arrive at the lake, Fonzie discovers what the resort is all about and says he's going to leave. He ends up staying which puts a damper on the rest of the guys' fun.
Howard decides that it is necessary to build a second bathroom after he's forced to shave at the dining room table. To save money, he decides to allow Fonzie's students to build the room. Howard doesn't realize that the room will take all semester to complete, and this hurts his plan to make a killing in whisper-quiet toilets. He fires Fonzie and the students and says he'll finish the bathroom himself.
Fonzie meets a beautiful woman, Nancy Haley, at his garage while listening to the radio in a beat-up 1955 Chevy. He takes the woman home, but when he goes back to return her purse, an older woman tells him that the Haleys moved out ten years ago when their daughter was killed in an automobile accident.
With the recent death of a fellow Leopard Lodge member, Howard fears that he may be ousted as Grand Poohbah for not attracting any new members other than Potsie during his five-year reign. He gets Fonzie, Chachi, and Roger to join as pledges, and they have to follow the orders of Potsie during their initiation.
Celebrate the 20th Anniversary of Happy Days, one of America's favorite TV shows, with members of the original cast. Includes personal recollections and film clips. Stars featured: Ron Howard, Henry Winkler, Tom Bosley, Marion Ross, Anson Williams, Danny Most, Noriuki "Pat" Morita and Scott Baio.
The cast of the 70's series "Happy Days" reunites after 30 years to look back on the show.
It's Fonzie's birthday, and past clips are shown as the gang reminisce.
Lori Beth has to write a term paper on the typical, middle-class family, so she interviews each Cunningham family member as well as their friends as clips from past episodes are shown. Fonzie says he'll tell Lori Beth something nobody knows about the Cunninghams.
An American family of the 1950s gets their first television. The teenage son Ritchie and his friend Potsie assume it can be used as a chick magnet. This was a precursor to the Happy Days series.