Brenda and Brandon are dateless for the Senior Prom. A school announcement is made that any student caught at Senior Prom drinking, intoxicated or with illicit drugs will be suspended from school and prevented from graduating. Footballer Tony Miller asks Brenda to prom on the day of the event, and Andrea asks Brandon at the last moment after her date, Jordan Bonner, gets ill. Steve takes Celeste Lundey, while Dylan naturally goes with Kelly. Donna doesn't eat all day so that she will fit into her prom dress. She is hit harder by pre-prom champagne than the rest of the gang, appears to be drunk at prom, and ends up collapsing in front of Mrs Teasley.

With 24 hours until graduation, Andrea frets with Brandon over her coming valedictorian speech and her college choice of California University or Yale, as does Brenda with Minnesota. Meanwhile, Dylan gets a windfall when he inherits his trust fund worth $10 million, as well as another surprise visit from his eccentric mother Iris, while he reconsiders his college choice of Berkley or California University. On graduation day, David and Donna are the MCs at the Senior Breakfast gathering while Steve meets with the gang to create something to remember them by.

On the day of graduation, the gang thinks back about their most memorable moments from the past three years. Andrea delivers her commencement address and everyone celebrates. Dylan also has a mysterious encounter with his late father who advises him that he doesn't need to go to college to prove himself. Dylan instead asks Kelly to take a trip through Europe with him for the summer. Steve also decides to go to California University to be near his friends, while Brenda decides to to back to college in Minnesota. The night of graduation, they all meet in the Hollywood Hills near the big Hollywood sign to create their logo on the sign for the whole city to see to remember them for the years they had at West Beverly High School.