The students of West Beverly are horrified to learn that the school board has pushed through a measure that will bar any student found drunk at the prom from graduation. Everyone scrambles for dates, and the Walsh twins find themselves dateless. Meanwhile, Mel Silver serves champagne at a pre-prom gathering, leaving waif-like Donna vulnerable to its effects.

As graduation approaches, the gang of West Beverly make their final decisions about the future while reminiscing about the past. Brandon is sad when Brenda announces her decision to attend the University of Minnesota. Andrea worries that she'll have to turn down Yale. Meanwhile, Mrs. Teasley finds out about Steve's anonymous donation. Dylan's hippie mother, Iris, pays another unannounced and unwelcome visit.