Terrifier 3

After being beheaded by Sienna Shaw,[a] Art the Clown's headless body decapitates a police officer responding to the incident, and makes 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; 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 guilt and experiences a hallucination of her deceased best friend Brooke, whose death[a] 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 and kills a Santa Claus impersonator at a bar using liquid nitrogen and takes his Santa costume, then brutally kills a family with an axe in their home. 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 haunted attraction to retrieve their father's sword. Art arrives at the university and kills Mia and Cole with a chainsaw. 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 runs but is incapacitated by Art with a mallet.
Sienna regains consciousness and finds herself and Jess tied to chairs and gagged. 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. Victoria tells Sienna to open her Christmas gift from Gabbie, which, unbeknownst to Victoria, contains Sienna's sword. Sienna breaks free and uses the sword to cut Art's throat and decapitate Victoria. Victoria's pool of blood burns through the floor and creates a portal to Hell, into which Gabbie falls. Despite Sienna's efforts, Gabbie falls into the abyss with the sword. Art flees through a window and boards a city bus, and Sienna looks down at her wounded hands as they heal, vowing to find and rescue Gabbie.