Kristen Bell makes a guest voice appearance in the Season 33 premiere, "The Star of the Backstage," in which Marge (voice of Julie Kavner) stages a revival of her beloved high school musical. The nostalgic glow of her happy memories is threatened, however, by the return of a rival from the past. Dan Castellaneta, Nancy Cartwright, Yeardley Smith, Hank Azaria and Harry Shearer also are heard.