While killing time with the guys by attending an open house, Cleveland discovers he has a secret admirer. After tricking the real estate agent into revealing the name of the house owner, Cleveland learns it is Patty Donner. When he informs Donna, she is amused to remember that Patty was known as "Fatty Patty" in high school. Despite his disappointment, Cleveland heads off to Patty's to find she had lost a lot of weight and is now sexy. Boding, Patty reveals that Cleveland was the only one who had shown her kindness in high school. Cleveland commiserates on how Donna doesn't known him. At Donna's suggestion, Cleveland invites Patty to dinner where Donna is also shocked at Patty's new appearance. However, after Donna suffers from some not-so subtle insults, Donna forbids Cleveland from seeing her again.
Despite his wife's wishes, Cleveland visits Patty at her old house to have some wine. While at Patty's house Cleveland points out Donna's concerns about Cleveland and Patty. Patty then reveals she did wish that she and Cleveland could have been more than friends, around this time Cleveland realizes Patty drugged his wine, and Cleveland passes out. Cleveland wakes up the next morning and reads Patty's note, which reveals how she only wants to have Cleveland's kid, so stole his essence in the hopes of becoming pregnant. Cleveland finds Patty in a hot air balloon about the have the essence injected in until Donna arrives. Donna points out all of Cleveland's flaws, and convinces Patty that having Cleveland's kid is a bad idea.