Act I
The story takes place at Springfield High School. It's prom night and the gym is filled with homemade decorations. The show begins when the school's principal, Principal Varney, welcomes the class of 1958 to their Super Senior Prom and introduces the night's entertainment, The Marvelous Wonderettes. As the lights come up on the girls they sing "Mr. Sandman". Each are in their respective colors: Missy – tangerine, Suzy – blue, Cindy Lou – pink, and Betty Jean – green. During the song it becomes apparent that Suzy is dating the guy running the lights for the prom, Ritchie Stevens. After introducing themselves, the girls begin their second song of the evening, "Lollipop", which transitions into "Sugartime". After the song, the girls show off the cheer that won them third place at the State Song Leaders' competition and thank the teacher who leads their team, Mr. Lee.
When Betty Jean runs off to put their trophy in the school trophy case, Cindy Lou seizes her opportunity to steal Betty Jean's song, "Allegheny Moon". Hilarity ensues when Betty Jean returns to find that she's been duped. She tries her hardest to ruin Cindy Lou's performance, but Cindy Lou finds a way to recover.
After the song, Suzy and Missy explain to the promgoers (audience members) the events which led to them providing the entertainment that evening. It turns out that the boys from the glee club were supposed to perform, but the lead singer, Billy Ray Patton, was suspended from school for smoking ("Tobacco can kill, and make you ill."), so Mr. Lee called on The Marvelous Wonderettes to take their place. The girls announce that the theme of the prom is "Marvelous Dreams" and segue nicely into a medley of "All I Have to Do Is Dream" and "Dream Lover".
Missy then announces the nominees for that year's Prom Queen, who will get to choose her King after winning the vote. All four of the Marvelous Wonderettes are nominated along with Judy Carter, a girl with whom they have homeroom. Then it's time for the dreamcatcher, which will determine the order in which the girls will sing their solos. Suzy is selected to go first. In her giggly excitement, Suzy announces that her song is for her prom date, Ritchie, and then begins to sing "Stupid Cupid". Next up is Betty Jean, who sings "Lipstick on Your Collar", during which the audience discovers that her boyfriend, Johnny, has been cheating on her with Cindy Lou. A confrontation between the two girls is broken up by Suzy, who urges Betty Jean to calm down and continue with the performance. Cindy Lou is up next and sings "Lucky Lips". Betty Jean stands in the background mocking her performance, attempting to thwart Cindy Lou, but once again, Cindy Lou recovers gracefully. The only one left to sing is Missy, who sings "Secret Love". After her song, she announces that her secret love is Mr. Lee, the girl's Songleader Leader. Mr. Lee (who was chosen from the audience at the top of the show), is brought on stage and the girls serenade him with the songs "Mr. Lee", "Born Too Late", and "Teacher's Pet".
After returning Mr. Lee to his seat, an announcement is made over the loudspeaker that it's time for the talent portion of the Prom Queen competition. Missy explains that in order to keep things moving along, the rules committee has decided that all the girls will perform their talents simultaneously and only have 30 seconds in which to perform. Judy Carter has been excused from the talent portion because of a doctor's appointment. The girls scramble to set up their talents. Cindy Lou shows off a myriad of poses, Missy sings her best note over and over again, Suzy uses a lemon twist while blowing giant bubbles with her gum, and Betty Jean rushes to set up her fire baton routine, but the buzzer goes off before she has time to even light the baton.
Now it is time for everyone to vote for Prom Queen. The audience take out their ballots (included in the playbill) and circle their choice for queen as the girls wander through the theatre collecting the completed ballots. When the ballots are collected they are given to the girls' French teacher, Miss McPhereson, who is supposed to count them. As the ballots are being tallied, the girls sing a medley of "Sincerely" and "Goodnight Sweetheart, Goodnight". At the end of the song, it is announced that Suzy has been voted Prom Queen. Cindy Lou, who expected to win, is distraught, Betty Jean couldn't be happier that Cindy Lou lost, and Suzy is so surprised she chokes on her gum. Missy announces that it's time for Suzy to pick her Prom King. The girls ask her three questions, and through Suzy's answers discover that she has, to no one's surprise, chosen her prom date, Ritchie Stevens. Since she won, Suzy gets to sing a spotlight song, "Hold Me, Thrill Me, Kiss Me", which swells at the end when the other girls join in. The girls gather around and congratulate Suzy, except for Cindy Lou, who reaches out to touch the crown as the lights fade and intermission begins.
Act II
Act two begins with Principal Varney welcoming everyone back to Springfield High School and their ten-year reunion. The Marvelous Wonderettes are back to entertain everyone for the night. "Heatwave" begins to play and Cindy Lou, Betty Jean, and Missy appear to sing it. Noticeably missing is Suzy. When she finally enters, the audience discovers that she is pregnant. After the song, a brief reintroduction is made and the girls sing "Mr. Sandman" in tribute to their prom performance.
Ritchie, who is now Suzy's husband, is back running the lights, but it becomes apparent that they have run into some tough times in their relationship. To cheer her up, Missy decides to take out the dreamcatcher that they used at their senior prom. Despite her insistence that she put it in her purse that morning, Missy can't find it, so she decides they'll just ask each other the three questions that Suzy answered after winning Prom Queen. She says she'll go first, and the girls ask the questions: "Are you in love?" to which Missy answers, "yes"; "Is he someone we know?", another "yes"; "Is he here tonight", one more "yes", and Missy spills the beans. She has been dating Mr. Lee for the past five years. Now she has some questions for him, which she asks in her songs, "It's In His Kiss" and "Wedding Bell Blues".
Cindy Lou doesn't like what she sees; she thinks Missy shouldn't have to beg Mr. Lee for a marriage proposal, and helps her reclaim her confidence with the song "You Don't Own Me". After the song ends, Betty Jean discovers that Mr. Lee has had the dreamcatcher the whole time. She returns it to Missy, who discovers that Mr. Lee has attached an engagement ring to it! Overjoyed with the proposal, Missy breaks into song again, singing "With This Ring". Mr. Lee is brought back up on stage and the girls join Missy in singing as the happy couple celebrate.
Now that the dreamcatcher has been returned, the girls use it to select the next performer, Betty Jean. Missy says that it is Betty Jean's birthday as she takes the stage to relate what she's been up to since high school; she has been working at the neighborhood hardware store with her husband, the boy who used to cheat on her with Cindy Lou. It turns out things between her and her husband are just as bumpy now as they used to be. Lamenting, Betty Jean sings "I Only Want to Be With You". At the conclusion of her song she notices her husband spending time with Judy Carter. She sings "That's When The Tears Start" followed by "It's My Party". Cindy Lou attempts to comfort her, but Betty Jean is still angry with her about the events which took place in high school.
It's Cindy Lou's turn to perform next and she apologizes to Betty Jean as best she can before talking about her lack of luck in Hollywood, which resulted in her moving back to Springfield and falling in love with Billy Ray Patton, the rebel whose suspension from school 10 years earlier had led to the girls' performing. She sings "Son of A Preacher Man" and "Leader of the Pack" followed by "Maybe". After her song, Betty Jean opens her arms to Cindy Lou again and the two are reconciled.
Now it's Suzy's turn to take the stage. She is self-conscious of her pregnant body and still an emotional wreck about her personal life. She sings through tears "Maybe I Know". Missy tries to cheer her up, singing "Needle in a Haystack". Suzy, slowly gaining confidence, begins to sing "Rescue Me", but doesn't find her strength until her friends step up and support her in singing "RESPECT". At the end of the song, Ritchie blinks the lights to let Suzy know that he still loves her. In the end all is well again; Cindy Lou and Betty Jean are friends, Missy and Mr. Lee are getting married, and Suzy has reconnected with her husband. The girls sing "Thank You and Goodnight" to close out the show. As they exit they announce, "See you in 1978!".
