Molly prepares to attend the prom as the comedy series wraps up its first season with the conclusion of a two-part episode. What Molly had hoped would be a magical night with Ben, a pal she has a crush on, instead turns into a nightmare. After a shady gambler wins the deed to the Stage house from her brother Rick, Molly agrees to go to the big dance with the gangster's nerdy son so her family can keep their home. Meanwhile, Rick meets a sexy student who asks him to escort her to the dance, but his mischievous twin sisters decide to sabotage his evening.
Molly becomes smitten with her pretty and popular chemistry partner's clique; Mary and Jerry's anniversary celebration goes awry.Molly's new lab partner in science class is Nick's current girlfriend, with whom Molly soon bonds after Nick dumps the popular girl. Meanwhile, Jerry arranges to take Mary to a swing-club outing to celebrate their anniversary, not realizing that it's not a dance group but rather a spouse-swapping coterie.
Molly discovers that the Stages aren't the only wacky family in town. Mr. and Mrs. Finn, the fairly odd parents of Molly's soccer teammate Cookie and her younger brother, Mine. The Finns believe that ""if you don't feel like it, you don't have to do it,"" a philosophy that includes allowing the kids to choose their own names. Not wanting to hurt Cookie's feelings, Molly endures two uncomfortable visits to the Finn house, only to later find the loony clan in her own home with the tense Stages playing host.
When Molly decides to run for student-body president, she casts Grant in a music video announcing her candidacy. At first, the Christian rocker has no office aspirations of his own and fully supports his sister's campaign. But the voters who see the tape think that he's the one competing for the job. His popularity soars, thanks to the video, and he decides to throw his own hat into the ring. Chaos ensues and even Rick gets sucked into the quagmire when he becomes the hairstylist for both candidates.
Molly deals with a broken heart while trick-or-treat night in Wickettstown propels the Stage family into a frenzy of activity. The depressed teen is struggling to accept losing Nick to his ex-girlfriend and turns to her family members for help. Her hopes for aid are in vain, however, as Jerry obsesses over decorating the house, Mary strives to save money on candy by making her own taffy and Rick worries about losing his hair. To make matters worse, Molly learns a disturbing fact about her grandmother's new suitor, who promised to call Harriet after their first date.