Une équipe de podcasteurs britanniques se rend aux États-Unis pour réaliser un reportage sur le massacre perpétré par le psychopathe Michael Myers lors de la nuit d'Halloween en 1978. Le reportage prend soudain une tournure macabre lorsque Myers parvient à s'évader lors d'un transfert vers un nouvel asile psychiatrique. Sa seule préoccupation est de se venger de Laurie Strode, la survivante du massacre. Après le traumatisme qu'elle a vécu il y a quarante ans, Laurie se prépare au retour de Michael Myers, négligeant ainsi sa fille, Karen, et sa petite-fille, Allyson, dans le but d'affronter une ultime fois le désormais célèbre tueur d'Halloween.
Two teenage girls named Katie Embry (Amber Tamblyn) and Becca Kotler (Rachael Bella) are bored at a sleepover and eventually, they discuss an urban legend that involves a cursed videotape that kills the viewer 7 days after watching it. Katie reveals that she had watched the cursed videotape with her boyfriend and a group of friends last week while staying in a cabin for a vacation.
High school student Casey Becker receives a flirtatious phone call from an unknown person, asking her, "What's your favorite scary movie?" The situation quickly escalates as the caller turns sadistic and threatens her life. He reveals that her boyfriend Steve Orth is being held hostage. After Casey fails to answer a question correctly about horror films, Steve is murdered. When Casey refuses to cooperate with the caller, she is attacked and murdered by a masked killer. Her parents come home to find her body hanging from a tree.
While attending a preview of the film Stab, a film within a film based on the Woodsboro murders depicted in Scream, two Ohio Windsor College seniors, Maureen Evans and Phil Stevens are murdered by Ghostface. Phil is stabbed through the ear in a bathroom stall while trying to eavesdrop on strange whimpering noises. The killer, wearing a Ghostface costume, then returns to the screening and sits beside Maureen, before mortally stabbing her. At first the audience believe she is part of the raucuous acting out by audience members, until she falls dead in front of the cinema screen.
Cotton Weary, now living in Los Angeles and the host of a nationally syndicated television show, 100% Cotton, is called by Ghostface, who demands the whereabouts of Sidney Prescott, who has gone into hiding ever since the events of the second film. Cotton refuses to divulge that information, and when Ghostface comes to his home, both Cotton and his girlfriend Christine are murdered.
In the coastal town of Astoria, Oregon approximately six months after the events of the first movie, a teenage boy named Jake asks a classmate named Emily over to his house, under the guise of studying together; however, his motives are actually centered on having her watch Samara Morgan's cursed video tape, as his seven-day deadline is fast approaching. Emily plays the tape while Jake waits in the kitchen, but when he returns to the living room, it is revealed that she covered her eyes throughout the tape, and thus didn't see any of it. As she failed to perpetuate the guidelines of the tape's curse, Samara crawls out of the television and kills Jake in front of Emily.
On July 4, 1996, four high-school seniors - Julie, her boyfriend Ray, Julie's best friend Helen, and her boyfriend Barry - drive to an isolated beach after drinking at a party. While driving home, Ray becomes distracted and accidentally hits a pedestrian, apparently killing him.
18 septembre 2017. Theresa « Tree » Gelbman, une étudiante membre de la sororité Kappa, se réveille le jour de son anniversaire dans la chambre de Carter Davis, un étudiant l'ayant aidé après son énorme cuite de la nuit dernière. Tree, assez superficielle, repousse Carter, refuse les appels de son père, couche avec son professeur, le docteur marié Gregory Butler, et se comporte mal avec sa colocataire, l'infirmière Lori Spengler, même quand cette dernière essaye de lui faire une surprise pour son anniversaire. Dans la soirée, Tree se rend à une fête organisée plus loin dans le campus. Sur le chemin, elle est attaquée et violemment assassinée par un homme portant le masque de bébé de la mascotte de l'université. Tree se réveille aussitôt dans la chambre de Carter et se rend compte bientôt qu'elle est en train de revivre la même journée. Après s'être faite assassiner une seconde fois, Tree comprend qu'elle est bloquée dans une boucle temporelle.
High school student Kale Brecht and his father Daniel get into a serious car accident while driving home from a fishing trip, and Daniel dies. One year later, Kale remains inconsolable after his father's death. Near the end of the school year, he is reprimanded by his Spanish teacher, Señor Gutierrez, and when Gutierrez brings up Kale's father, Kale attacks him. For this assault, he is sentenced by the sympathetic judge to a three-month house arrest period with an ankle monitor and a proximity sensor, which prohibit him from roaming beyond the boundaries of his house and yard. He then learns that one of the police officers monitoring him is his teacher's arrogant cousin. Initially, he satiates his boredom by playing video games, but shortly after, his mother Julie cancels his subscriptions to the iTunes Music Store and Xbox Live, and cuts the power cord of his television in order to get him to learn a hard lesson.
The film picks up immediately after the end of the last film, with Marybeth Dunston (Danielle Harris) blowing off the head of Victor Crowley (Kane Hodder) with a shotgun. She walks away and comes across the bodies of Vernon and John, where she hears Crowley in the woods. Marybeth starts up the chainsaw, but is grabbed by Victor. Marybeth kicks him, and he falls backwards onto the chainsaw, cutting him down the middle. She grabs a shotgun from one of the men and shoots Victor's head, and walks back into the city. She walks into the Jefferson Parish Police Department, immediately having guns drawn on her. Upon discovery of the twenty to thirty bodies at Honey Island Swamp, she is placed as the prime suspect in the murders by Sheriff Fowler (Zach Galligan), even after telling him numerous times about the events of the last two films. The Sheriff heads out to the swamp with the paramedics and fire department, leaving Deputy Winslow (Robert Diago DoQui) in charge of the station until he gets back.
Kris Fowles (Katie Cassidy) goes to the Springwood Diner to meet with her boyfriend, Dean Russell (Kellan Lutz), who falls asleep at the table and meets a man covered in burn scars, wearing a red and green sweater, a fedora and a clawed glove on his hand. The burned man cuts Dean's throat in the dream, but in reality it appears that Dean is cutting his own throat as his friend, waitress Nancy Holbrook (Rooney Mara), looks on with Kris. At Dean's funeral, Kris sees a photograph of her and Dean as children, but cannot recall ever knowing Dean before high school. Kris begins to dream about the burned man herself and refuses to go to sleep for fear that she will die in her dreams. Jesse Braun (Thomas Dekker), Kris's ex-boyfriend, shows up at her house to keep her company while she sleeps, but Kris meets the burned man in her dreams and is murdered. Covered in blood, Jesse runs to Nancy's house to try to explain what happened and he learns that Nancy has been having dreams about the same man: Freddy Krueger (Jackie Earle Haley).
Freddy Krueger is trapped in Hell, it's 2003 and 4 years after the events and time of the sixth film and due to the fact the teenage residents of his town of Springwood, Ohio have forgotten about him, rendering him powerless, he can no longer return to Springwood, because there's no fear of him left in the entire town. He "can't come back if nobody's afraid", so, under the guise of Jason Voorhees' mother, Freddy manipulates Jason, who he'd been looking for over a period of time to do so, into killing the teenage residents of Springwood, hoping the mass fear will restore his powers. After all, residents of Springwood were terrorized by Freddy, not Jason, so obviously, every ounce of fear would be directed towards him, giving him more power than he'd ever hoped for. His plan works, but only to the extent of allowing his return.
On August 18, 1973, five young adults, Erin (Jessica Biel), her boyfriend Kemper (Eric Balfour) and their friends Morgan (Jonathan Tucker), Andy (Mike Vogel), and Pepper (Erica Leerhsen), are on their way to a Lynyrd Skynyrd concert after returning from Mexico to buy marijuana. While driving through Texas, they pick up a distraught hitchhiker (Lauren German) they see walking in the middle of the road. They try to talk to the hitchhiker, who speaks incoherently about "a bad man." She then pulls out a .357 Magnum and shoots herself in the mouth.
On the Valentine's Day of 1997, in a small town, a cave-in on the north side of a Hanninger mine trapped six miners. Six days later, rescue teams found five dead miners and the comatose Harry Warden (Richard John Walters), who survived by killing the other miners with a pickaxe, allowing himself to breathe. Tom Hanniger (Jensen Ackles), the mine owner's son, was blamed for the mine disaster because he forgot to vent the methane lines and caused a cave-in, but also Harry Warden for killing the miners.