It's the day before Halloween, and to every teacher's dismay, school has been overrun by princesses and monsters, Jedi and ghouls. In every classroom, teachers are struggling to keep order, but students have brought in their costumes to celebrate a day early. A group of girls sneak into the bathroom to exchange tiaras, and grotesquely dressed fifth-graders pretend to eat two younger students in the cafeteria. The entire school has turned into a haunted house, and as cupcake icing spreads all over the desks, the teachers look for a way to escape the annual Halloween Day parade. But when the principal issues a memo that says all teachers must attend the parade, the faculty wake up on Halloween morning filled with dread. But there's a treat in store for the teachers this year. The students and their parents have canceled the Halloween Day parade, and the teachers are ecstatic. There's just one catch, the students promise-next year, there's bound to be more trick than treat.