After the latest attack by The Green Meanie leaves everyone shocked and saddened, Dean Munsch and Denise, along with Hester, devise a plan to catch the killer by throwing a Halloween party in the hospital. Meanwhile, Chanel celebrates a different kind of Chanel-O-Ween and attempts to make contact with the killer’s latest victim from beyond the grave. Once the party begins, an outbreak surprises the hospital, leading Brock and Cassidy to jump into action, and another victim falls.