Shocking confessions are made as the Red Devil is finally unmasked and the killer revealed.

Chad takes Chanel to his family home for Thanksgiving, where she meets his brothers, Brad and Thad, as well as his parents. However, an uninvited guest throws the holiday into chaos. Meanwhile, Dean Munsch gathers the survivors at Kappa House, but dinner quickly explodes into accusations of who among them is really the killer. Then, the Red Devil carves up a deadly main course as another victim falls.

Shocking confessions are made as the Red Devil is finally unmasked and the killer revealed.

The Green Meanie sets its final plan for revenge in motion as Hester makes a bold move to secure her future, and Brock performs a dangerous surgery to save Dean Munsch's life.

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.

Denise does little to calm the Kappas' fears when she spins a terrifying ghost story. Meanwhile, Hester's shocking announcement pushes Chanel to the edge, and a familiar face returns to campus as the Red Devil claims another victim.

As Halloween approaches, Chanel creates a devious plan after Zayday makes a shocking announcement. Meanwhile Grace and Pete pay a visit to a mysterious woman with ties to Kappa's past. Also, Hester grows closer to Chad, Denise continues her search for the red devil killer and Dean Munsch does everything in her power to keep Wallace University open.

Twenty years after a mysterious death rocks Wallace University, another murder takes place.

In an effort to secure positive press for the hospital, Dean Munsch pitches a risky surgery to Dr. Holt, whose hand begins expressing more of a wild and dangerous personality than ever before. Meanwhile, Chanel #3 forces Cassidy to undergo a psych test to find the root of his condition with surprising results, and Nurse Hoffel sets a devious plan in motion.

After an influx of patents at the C.U.R.E. institute, Dean Munsch and Chanel organize a blood drive to solve the hospital's severe shortage. Meanwhile, Nurse Hoffel sets a plan of revenge in motion, Hester finds a way to join the hospital's staff and a shocking revelation involving The Green Meanie occurs.

A man from Dean Munsch's past checks in to the C.U.R.E. institute with plans to win her back, causing a jealous Brock to further question his relationship with Chanel. Meanwhile, Zayday and Chamberlain devise a plan to discover the origins of The Green Meanie killer with shocking results.

Dean Munsch is left in a desperate situation when a shocking event leads her to come face-to-face with her ex-husband's mistress. Meanwhile, in an attempt to determine who the Red Devil killer is, the Kappas use a Ouija board to communicate with Chanel #2 from beyond the grave and learn of a wicked plot against one of their own.

Grace enlists Chanel’s help to learn more about KKT’s past, and ends up realizing she might not be so different from her nemesis after all. Dean Munsch goes “psycho” when she becomes the latest target of the Red Devils. Meanwhile, Denise becomes the new house mother of Kappa House and a shocking figure from the past returns.

In an attempt to protect herself from the killer, Chanel makes a surprising decision, which leaves Zayday in a position of power. To stay close to each other, the girls of Kappa Kappa Tau host a slumber party, but when a shocking discovery is made, not everyone will survive the night.