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Remember the little sister of Donna Pinciotti (Laura Prepon), who made an appearance on this first-season episode of That '70s Show, only to pull a "Chuck Cunningham" and completely disappear from view? Well, it seems that Donna is baby-sitting for sister Tina (Amanda Fuller) while her parents (Don Stark, Tanya Roberts) are patronizing an out-of-town Playboy Club. Meanwhile, Eric (Topher Grace) is suffering through his new job at Fatso Burger. Informed that Donna is having a "party," Eric manages to slip away from work, only to find that the amorous Donna has a two-party party in mind. By the time Eric figures out what the girl really wants -- and obligingly gets to "work" -- guess who comes home a bit too early? Former Partridge Family regular Danny Bonaduce guest stars.