Betty Buckley

When Jessica (DeWanda Wise) moves back into her childhood home with her family, her youngest stepdaughter Alice (Pyper Braun) develops an eerie attachment to a stuffed bear named Chauncey she finds in the basement. As Alices behavior becomes more and more concerning, Jessica intervenes only to realize Chauncey is much more than the stuffed toy bear she believed him to be.

Casey Cooke (Anya Taylor-Joy) is a withdrawn teenager, having been molested as a child by her uncle John, her legal guardian since her father died from a heart attack. After a pity invite to a birthday party, she is offered a ride home by her classmate Claire (Haley Lu Richardson) and Claire's father, along with Claire's friend Marcia (Jessica Sula). As the girls wait for Claire's father in the car, he is knocked unconscious and Casey, Claire, and Marcia, are kidnapped by Kevin Wendell Crumb (James McAvoy), a man suffering from Dissociative identity disorder (DID). Kevin is in therapy with Dr. Karen Fletcher (Betty Buckley), who has identified 23 distinct personalities of Kevin. In his mind, these personalities sit in chairs in a room, waiting for "Barry", the dominant personality, to grant them their turn "in the light" (in control). She has also found that Kevin's physiology changes with each personality. Recently, "Barry" has refused to allow "Dennis" or "Patricia" their turns, in part due to Dennis' tendencies towards bothering underage girls and Patricia's undesirable traits, and also because both appear to worship a mysterious entity known as "The Beast". Fletcher has found that she can bring back Kevin's own personality by speaking his full name. Kevin, as "Dennis", locks the girls in a cell in his underground quarters. They recognize his DID, and Claire attempts to use this to escape but is caught by "Dennis" and separated from the others. Kevin continues going to work and attending appointments with Fletcher. Fletcher soon recognizes that "Dennis" has displaced "Barry" as the dominant personality. It is revealed that when Kevin was a child, his father left on a train one day and never returned. As he grew up, Kevin was abused and terrorized by his mother, who suffered from obsessive-compulsive disorder (OCD). He later experienced an awkward incident with two teenage girls where they forced Kevin to touch their breasts, which Fletcher believes triggered "Dennis" to take over. Marcia attempts to escape but is caught by "Patricia". Casey befriends "Hedwig", another one of Kevin's personalities that is a 9 year-old boy, who reveals himself as the one to have taken control of "the light" from "Barry". Casey convinces "Hedwig" to let her out of her cell to see his bedroom, believing that there might be a means of escape through the window "Hedwig" has described in that room, but she finds that it is only a drawing of a window. She takes a Walkie-Talkie from Hedwig and uses it to call for help, but the man at the other end thinks it is a prank. "Patricia" takes over and subdues Casey. Fletcher visits Kevin's home, where he reveals that he has met "The Beast", in actuality a yet-to-manifest 24th personality. Realizing that "Dennis" may have abducted the three missing girls to serve as a sacrifice to "The Beast", Fletcher feigns going to the bathroom, searches the house, and finds Claire. "Dennis" suddenly appears, sedates Fletcher and locks her up as well. "The Beast": a grotesque and cannibalistic sociopath with superhuman capabilities, such as inhuman bodily strength, enhanced speed and agility, along with near-invulnerability and unnatural mobility, to the point of being able to scale walls and ceilings but resulting in his insatiable hunger for raw human flesh. "Dennis" goes to a train station, where he boards an empty train car, which allows "The Beast" to finally take over, giving Kevin superhuman abilities. Fletcher writes Kevin's full name on a piece of paper before "The Beast" arrives and kills her. Casey escapes from her cell, only to find that "The Beast" has already devoured Marcia and watches in horror as he devours Claire too. Casey finds Fletcher's body and the piece of paper. "The Beast" approaches her, but she calls out Kevin's full name, bringing Kevin forth. Upon learning of the situation and realizing that he has not been in control for two years, a horrified Kevin begs Casey to kill him with a shotgun he has hidden. This prompts all 24 personalities to fight for control of "the light" and "Hedwig" is the victor. He gives control over to the undesirable personalities-"Dennis" and "Patricia"-so nobody will ever make fun of him again and they once again let "The Beast" take hold. Casey retrieves the gun and ammunition before escaping into an underground tunnel, where she shoots "The Beast" twice to no effect. She locks herself in a caged area whose bars "The Beast" begins to pull apart. Then he sees faded scars across her body from cutting herself. Having previously declared his plans to rid the world of the "impure" and "untouched"-those who have never suffered-he considers Casey to be "pure" so he spares her and he runs off. Casey is rescued and learns that she was being held at the Philadelphia Zoo, where Kevin had been an employee. When Casey is asked if she is ready to return home with her uncle, she hesitates to answer. In another hideout, "Dennis", "Patricia", and "Hedwig" discuss the power of "The Beast" and their plans to change the world. In a diner, several patrons watch as a news correspondent reports that Kevin's numerous personalities have earned him the nickname "The Horde". One patron notes the similarity to the case of a wheelchair-bound criminal incarcerated 15 years earlier who was also given a nickname. As she tries to remember the nickname, the man sitting next to her, David Dunn (Bruce Willis), says it was "Mr. Glass".

The film begins in the locker room full of teenage girls, including Carrie White (Sissy Spacek). Carrie gets her first period, and after becoming distressed, cries out for help. Instead of helping, the other girls ridicule and harass her, throwing out tampons, sanitary towels and toilet paper to her. Teacher Miss Collins (Betty Buckley) rushes in to stop the commotion. White, who appears to be bottling extreme rage, snaps a light bulb. After questioning Carrie, Miss Collins realizes that Carrie is unaware of the concept of menstruation. Because of this, Miss Collins asks the school principal to excuse Carrie from gym class for a week because of the trauma. Upon her way home, Carrie uses her recently discovered telekinesis to stop a boy from teasing her. While at home, Carrie is tormented by her delusional mother (Piper Laurie), who locks Carrie in a closet and forces her to pray--she believes that Carrie received her period due to sinning. Miss Collins, still livid about the incident, berates the other girls and forces them through a detention, deliberately physically exhausting them. The leader of the clique, Chris Hargensen (Nancy Allen), refuses to participate, and as punishment, is banned from the upcoming prom. Furious, she blames Carrie for her misfortune. Meanwhile, another one of the girls, Sue Snell (Amy Irving), feels guilty about her part in teasing Carrie, so she asks her boyfriend, Tommy Ross (William Katt), to take Carrie to the prom. Tommy begrudgingly agrees. After Tommy asks her to the prom, Carrie refuses, thinking that yet another trick is being played on her. After a comforting pep talk with Miss Collins, and after Tommy's further insistence, Carrie finally agrees to go to the prom with Tommy. While everyone else is getting ready for the prom, Chris schemes with her boyfriend Billy Nolan (John Travolta) and best friend Norma (P.J. Soles) to get revenge on Carrie. They go to a farm and slaughter some pigs, drain their blood into a bucket, and place the bucket on one of the rafters in the school gym. Carrie asks her mother's permission to go to the prom. Her mother becomes unhinged at the suggestion, commenting that Tommy is only after her for sex and that this will lead her down a road to perpetual sin. This leads to a violent argument between Carrie and her mother; who uses her telekinesis to slam windows and doors in her home. After another fight between Carrie and her mother the night of the prom, Carrie uses her powers to push her mother into a bed and tells her that she must stop worrying. Carrie and Tommy arrive at the prom, and Carrie begins to feel accepted by Tommy's peers. Miss Collins relates to Carrie the story of her own prom, telling her she should cherish the memory forever. Carrie and Tommy dance together; Tommy has since fallen for Carrie and kisses her. As per Chris' instructions, Norma and some of Billy's friends fix the ballots so that Carrie and Tommy are elected prom king and queen. They make their way to the stage, and Carrie finally feels what it's like to be accepted. Meanwhile, Sue sneaks into the prom and sees Chris and Billy under the stage. She realizes their plan: Chris is going to yank a cord and dump the pig's blood all over Carrie as she is declared prom queen. Sue rushes toward the stage frantically but is intercepted by Miss Collins, who thinks that Sue is out to make trouble for Carrie after seeing that Carrie and Tommy are together. Miss Collins throws her out of the gym, thinking that she was to spoil Carrie's moment. At that exact moment, Chris yanks the cord, drenching Carrie in pig's blood. The students gasp and look on in horror. Tommy is furious, but the bucket falls and knocks him unconscious. Carrie snaps and imagines that all of the students and faculty are actually laughing at her, which her mother had warned her would happen. Carrie uses her telekinesis to destroy the gym and kill her peers and teachers, including Miss Collins. As Carrie walks home, a firetruck is seen passing her. Chris and Billy, who safely witnessed Carrie cause the death of the entire student body, attempt to run Carrie over with Billy's car. Carrie uses her telekinesis to destroy the car. When Carrie returns home, she draws a bath. After she cleaned herself, her mother appears and tells her she was the result of a strange marital rape. Then, convinced that her daughter is an evil witch, she takes out a chopping knife and stabs Carrie in the back. Carrie falls down the stairs and stumbles away from her mother. When her mother corners her in the kitchen, Carrie uses her power to crucify her mother with kitchen knives & tools. After the death, Carrie becomes wrought with guilt and using the lit candles, sets her house ablaze. The home eventually collapses and Carrie dies amongst the debris. Sometime later, Sue, having survived the prom night catastrophe, is suffering from depression over the death of her peers. She experiences a nightmare in which she visits the location of Carrie's house. As she reaches down to put flowers on the burnt lot, Carrie's blood-stained hand reaches up from the rubble and grabs her. Sue then wakes up screaming in the arms of her mother.