Following conversations with Miss Collins and the principal, Carrie is dismissed from school for the day. After arriving home, Margaret tells Carrie that her menstruation was caused by sin, and she locks Carrie in an altar-like "prayer closet" to pray for forgiveness. At school, Collins reprimands Carrie's tormentors, punishing them with a week-long detention during gym class. She threatens that those who skip the punitive measure will be suspended for three days and barred from the upcoming prom. However, Carrie's longtime bully, Christine "Chris" Hargensen, walks out and gets excluded from the prom. Plotting vengeance against Carrie, Chris and her boyfriend Billy Nolan break into a farm and kill pigs to drain their blood into a bucket, which they place above the school's stage in the gymnasium. Norma, Chris' best friend and a prominent figure in the school's student council regime, plans to rig the Prom Queen election in Carrie's favor to get her on the stage. Meanwhile, Sue Snell, a deeply remorseful classmate, asks her handsome and popular boyfriend, Tommy Ross, to invite Carrie to the prom. Carrie believes the proposition is a prank, but he insists that it is genuine and she reluctantly accepts after Miss Collins consoles her. At home, she begins to discover that she has telekinesis as she shakes off her shyness. Despite Margaret's protests, Carrie puts on a flattering dress and hairstyle for the prom. Margaret sees Carrie's telekinetic powers and denounces her as a witch before Carrie leaves with Tommy. During the prom, Chris and Billy hide under the stage while the other conspirators switch the ballots to ensure that Carrie wins the Prom Queen title. As Carrie stands onstage with Tommy, finally beginning to feel accepted by her peers, Sue realizes Chris and Billy's plan, and begins to intervene. Miss Collins spots Sue and, thinking that she is up to no good, throws her out of the prom. Chris and Billy pull the rope attached to the bucket of pig blood, dousing Carrie; they then sneak out of the school. The empty bucket hits the outraged Tommy in the head, and he collapses. The crowd is left shocked and speechless at the prank, but Carrie hallucinates that everyone, even Miss Collins, is mocking her and, in a sudden outburst, telekinetically seals the exits and controls a fire hose, which injures several party-goers attempting to escape and sprays the overhead lights. Miss Collins