When Stan forgets his anniversary, he arranges to have 20 hours of Francine's memory erased, but the CIA temp on duty accidentally erases 20 years. Francine, having reverted to her wild child days, moves into her old apartment with Hayley as a roommate, and ends up going to a festival with Hayley's boyfriend. Meanwhile, Steve asks a good-looking girl out, but needs his wingman, Roger, to "jump on a grenade" for him and date her ugly cousin.

Stan wants Steve to be popular and goes to desperate measures giving him steroids to make him bigger, better, and part of the in-crowd at school. But when the steroids have an unexpected side effect, Steve gets a lot more attention than anyone expected. Meanwhile, after Hayley makes a movie about Francine's life as a housewife, Francine is determined to start a new career as a doctor.

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.

Stan sets Bullock up on a date with one of Francine's friends. Fearing that Francine will be right about the outcome of the date, Stan goes to great lengths to make sure it goes well by getting everyone drunk. Unfortunately, Bullock accidentally kills the woman, to which Stan frames Francine for the murder in order to keep her from asking so many questions.

Stan hunts for an ex-KGB agent but can't find him--until he moves in next door. And Steve is building a rocket for a school science project, but can't get it to work--until he gets some help from his new next-door neighbor. Meanwhile, Roger and Klaus head off on a European vacation.

It's Roger's 1600th birthday, but the Smiths are too freaked out by Steve's impending puberty to celebrate. So Roger decides to make his own birthday fun.