Raven and Chelsea are left off the guest list for a Halloween party hosted by mean-spirited Alana (Adrienne Bailon). A magic spell meant to get them a last-minute invite is successful, but their wish for "the best costumes" backfires when the girls transform into mooing cows. In other holiday happenings, Cory breaks tradition by trick-or-treating without Victor.

Raven unwittingly becomes responsible for the principal ordering all students to wear uniforms.