Al and Joanie dance at the "Al O'Delvecchio St. Patrick Dance" as Potsie sings, and the band plays. Joanie's friend, Roger, says the dance was "keen." She tells him to stop saying "keen." A group of guys, including Herbie the Turk of the Red Devils, want Joanie and Roger's booth. She refuses to give it up, and Herbie says she'd fit in well with the Red Devils. Herbie wants the band to play a fast song while Fonzie wants a slow song. Herbie and Fonzie exchange insults. Al gives out free green hamburgers (dyed green with food coloring) to anyone that doesn't fight. Each member of the Red Devils takes one. Joanie thinks the Red Devils are keen. At the house, Joanie arrives from the dance complaining about her dull life. Later, she comes down from her room wearing an outfit that would befit her being a member of the Red Devils. Howard refuses to let her go out that way and sends her back upstairs. Howard and Marion leave to go bowling with the Hendersons. Richie returns from a baseball game. He laughs at Joanie. She leaves for Arnold's. Leroy asks Joanie to a Red Devils party that night. Richie comes in looking for Joanie. He finds out from Becky Bronski, a member of the gang, that part of the gang's initiation is to neck with each of the eight members. Becky can't reveal where the initiation takes place. The Red Devils take Joanie to the school gymnasium for the initiaiton. Richie ("Iron-Dukes Cunningham") comes to rescue Joanie, but he is badly outnumbered by the Red Devils. Fonzie just happens to be in one of the lockers. Potsie, Ralph, and "The Big Ragu" Carmine Ragusa are also there. Joanie leaves. Richie, Ralph, and Potsie fight three of the Red Devils' members. Nothing is really solved, so Fonzie and Carmine scare the Red Devils off after mule-kicking Herbie and Leroy. At the house, the guys are all battered and bruised after the fight, and Marion tends to them. The guys leave. Howard and Marion talk to Joanie and say they will not treat her like a kid anymore but like a young lady.
Songs in this episode:
"McNamera's Band" (played by the band) by Bing Crosby (1946)
"When Irish Eyes Are Smiling" (played by the band) by Chauncey Olcott (1912)
"I'm Walkin'" by Fats Domino (1957)
"Young Love" by Tab Hunter (1957)