 During the first day back of the new school year at J.F.K. Junior High, preppy and pathological liar Zack Morris runs into a 9th grade student, named Carla, whom he had earlier that summer lied about his age in order to get to know her better and he persuades classmates Mikey, Screech, Tina, and Nikki to help with his charade. Meanwhile, Miss Bliss tries to squeeze into her new schedule a dinner date with her new doctor boyfriend.