Veronica, fed up with JD, goes on a double date with Heather Duke and two handsome football players; the school musical auditions commence and Heather Chandler meets unexpected competition.

Heather Chandler tries to double down on her suicide campaign only to have her brand tarnished; Betty Finn has some suspicions that link Veronica to an unsolved murder.

Veronica schools JD on how to be a proper boyfriend; Heather Duke and Heather Chandler spar over control of the hearts and minds of the Westerburg student body.

In response to the spate of violence and unrest in their area, Westerburg decides to stage an "active shooter" training drill in which students are placed on lockdown while the drama teacher goes classroom-to-classroom spraying people with silly string.

Prom brings all of the surviving characters together one last time. JD and Veronica attend separately and fight over some philosophical differences. Heather Chandler tries to make prom about her. Betty Finn returns.

As prom looms around the corner, JD and Veronica are moving in opposite directions. She is closer to her friends than she has been all year, while he is trying to use prom to keep Westerburg divided by pitting Heather Duke against Heather Chandler.