Christmas Bloodbath

After being beheaded by Sienna Shaw, Art the Clown's decapitated body reanimates inside the Terrifier haunted house, strangles and decapitates a police officer responding to the incident before making its way to the asylum where survivor Victoria Heyes, now possessed by the Little Pale Girl, has just given birth to Art's head. Art reattaches his head to his body shortly after he and Victoria kill a nurse and a guard before entering an abandoned house and going into hibernation. Five years later, Sienna is released from a mental health center to stay with her aunt Jess, her uncle Greg, and her cousin Gabbie, who idolizes Sienna but has no knowledge of the events she endured. Sienna is suffering from survivor's guilt and experiences PTSD induced hallucinations of deceased people who Art killed, including that of her best friend Brooke, whose death she feels responsible for. She struggles to reconnect with her younger brother Jonathan, who is now in college. Art and Victoria are woken by two demolition workers; they kill the workers. Art then shoots two men dead, kills a Santa Claus impersonator at a bar using liquid nitrogen and takes his Santa costume. At 3 a.m., he invades the house of an innocent family and brutally butchers them with an axe. In the morning, Art poses as a mall Santa and uses explosives disguised as presents to kill several people, many of them children. Sienna thinks she sees Art at the mall in disguise before the explosion but does not tell her family out of fear that they will not believe her. Sienna visits Jonathan at his university, where she meets Jonathan's roommate Cole and his girlfriend Mia, who hosts a true crime podcast. Mia pressures Sienna and Jonathan to participate in an interview about the Miles County Massacre, but Sienna lashes out. Sienna confesses to Jonathan that she thinks Art is still alive, and she shows Jonathan a letter that he wrote to her while she was in the psychiatric hospital, which states that demons can come into our world via possessing hosts like Victoria with the help of evil and depraved killers like Art. She tells Jonathan that she plans to return to the Terrifier carnival to retrieve their father's sword. Art arrives at the university and kills Mia and Cole with a chainsaw while they're having sex in the shower. Sienna learns about the mall killings on the news and panics, commanding Jonathan to return home from college and warning the family that they are not safe. Greg leaves to collect Jonathan while Sienna falls asleep. She dreams of her father and of the angels crafting the armor from her warrior costume that he drew for her. Sienna awakens to hear Jess and Greg downstairs discussing what they should do about her worsening condition. When she walks into the dining room, Sienna instead finds Art and Victoria decorating Greg's decapitated and eviscerated body pinned to the wall. Sienna tries to escape but is incapacitated by Art with a mallet. Sienna regains consciousness and finds herself and Jess tied to chairs with their mouths taped shut. Victoria shows them a skinless head being consumed by rats, telling Jess that it is Gabbie's head. Art and Victoria kill Jess by hammering a tube into her throat, forcing rats down it and slitting her throat. Art enters with Gabbie as a hostage, and Victoria tells Sienna that the head is actually Jonathan's head. Victoria places a crown of thorns on Sienna's head and tries to possess her, but she resists. Before Sienna and Gabbie could be sentenced to death, the latter pleads for Sienna to open a present of hers, which, unbeknownst to Victoria, contains Sienna's sword. Art smashes both of Sienna's hands then cuts her bonds so she can open up her present. Sienna then uses the sword to cut Art's throat and decapitate Victoria. As Art and Sienna battle each other, Victoria's body disintegrates and turns into a pool of demonic blood that burns through the floor and opens a portal to Hell, putting Gabbie's life in danger. Despite Sienna's efforts, Gabbie falls into the abyss with the sword. Art seizes his opportunity to escape through a window and boards a city bus, whilst Sienna looks down at her wounded hands as they heal, vowing to find and rescue Gabbie.