Because she's never been to his house or met his mother, Joanie thinks that Chachi is ashamed of her. Fonzie invites the Cunninghams over to the Arcola's for dinner on Chachi's behalf. Fonzie surmizes that Chachi is embarrassed of his mother and uncle and of the fact that they're poor.

Al tells Chachi about his dull, mundane life, so Chachi suggests that he ask his mother out. He shows up at Arnold's the next night disheveled and tells Chachi that his mother is already seeing someone. Chachi is shocked and vows to get to the bottom of it.

After a month of dating, Al wants to ask Chachi's mom to marry him. Being an old fashioned guy, Al asks Chachi's permission. He grants it but doesn't think she'll want to marry Al.

After deciding to quit the band, Joanie moves back in with Howard and Marion to enroll in a teaching program at the University of Wisconsin. Chachi tries to convince her to stay with him in Chicago after he isn't willing to go with her back to Milwaukee.

Fonzie's adoption request is reconsidered after a stern talk by Howard to the adoptions administrator.

Meanwhile, Joanie and Chachi continue to prepare for their wedding.