Stan realizes his own weight problem after he criticizes Steve about his new, overweight girlfriend, so he goes overboard with exercising, and develops anorexia. Steve realizes that his overweight girlfriend is the root of his father's problems, and he has to make a hard choice in an effort to save his father's life.

When Steve's new relationship with his girlfriend gives Francine empty nest syndrome, she tries to convince Stan to have another baby. Meanwhile, Roger tries to enroll in college with Haley in order to experience college life, but while Roger ends up teaching the class, Haley finds a new crush in her classmate Ethan (Elijah Woods), who turns out to be far from normal.

Steve plots revenge after girlfriend Debbie loses a very dirty election for class president. But it backfires badly.

Steve and his friends sabotage a stuck-up kid's bar mitzvah after the kid hits on Steve's girlfriend, Debbie. But when Snot is wrongly accused of stealing the kid's bar-mitzvah money, his own bar mitzvah is put in jeopardy.