The story revolves around a struggle to determine which of Satan's (Harvey Keitel) three sons will succeed their father as ruler of Hell. Adrian (Rhys Ifans) is the most devious, Cassius (Tom Lister Jr.) is the cruelest, and Nicky (Adam Sandler) is their father's favourite. Adrian and Cassius claim that Nicky's mother is a goat and torment him by controlling his body with their minds. Nicky has had a speech impediment and a disfigured jaw since Cassius hit him in the face with a shovel.
Le soir après son mariage, Grace est invitée à rejoindre la famille de son mari, les Le Domas, pour une soirée jeu. C'est une tradition familiale: après chaque mariage, le nouveau venu tire une carte qui indique le jeu de la soirée. Après la partie, il rejoint officiellement la famille.
L'ex-policière Megan Reed a perdu son poste suite à une arrestation qui a mal tourné. En cure de désintoxication dans un hôpital de Boston, elle accepte un poste d'agent d'admission dans la morgue de l'établissement. Une nuit, elle reçoit le cadavre de Hannah Grace, une jeune femme décédée 3 mois plus tôt suite à plusieurs exorcismes ratés. Mais l'esprit démoniaque qui a pris possession de son corps n'a pas disparu et l'amène à commettre plusieurs meurtres qui vont mettre les nerfs de Megan à rude épreuve.
The film begins with the point of view of someone wandering through the streets of Georgetown, a voice informing us "I have dreams... of a rose... and of falling down a long flight of stairs." The point of view shows a warning of evil about to arrive later that night at a church. Demonic growls are heard. Leaves and other street trash suddenly come flying into the church as a crucifix comes to life. It then cuts to Lieutenant William F. Kinderman (George C. Scott) at a crime scene, where a 12-year-old boy named Thomas Kintry has been murdered.
The film opens in the utopian future that results from the music of Bill (Alex Winter) and Ted (Keanu Reeves). Chuck De Nomolos (Joss Ackland), who detests this society, steals one of the time-traveling phone booths and sends two robots modeled after Bill and Ted to the late 20th century, with the intent to prevent Bill and Ted from winning the San Dimas Battle of the Bands. Rufus (George Carlin) attempts to stop De Nomolos but becomes lost in the circuits of time.
Jonathan et son amie Rebecca emménagent dans la vaste demeure que le jeune homme vient d'avoir en héritage. La maison appartenait à son père mais Jonathan ne l'a pas connu. En inspectant la bibliothèque, Jonathan découvre de nombreux livres de magie noire. Au cours d'une soirée, Jonathan pratique un rite d'initiation sans succès apparemment. Il devient de plus en plus accro à ces pratiques et suit avec méthodologie les instructions des livres. Bientôt, il parvient à faire surgir de petites créatures démoniaques et acquiert de plus en plus de puissance...
Ramirez (Jacob Vargas) speaks in a voice-over about stories that his mother told him about the devil sometimes actively seeking out individuals who have sinned, while they're still alive on Earth. While taking human form, he traps them in a confined place only to turn them against each other, before killing them one at a time. Ramirez explains that the last victim will die in front of his or her loved one to make cynics of them all. He says that the signs are set in motion with a suicide, as that is when the Devil first makes his presence known. This story is abruptly interrupted by a violent suicide of a man who had fallen from the thirty-fifth floor of a Philadelphia office building. The truck he falls on rolls silently away.
In 1965, Rosemary Woodhouse (Mia Farrow), a bright but somewhat naive young housewife, and Guy (John Cassavetes), her husband and a struggling actor, move into the Bramford, an antiquated New York City apartment building. The couple learns from the building's manager, Mr. Nicklas (Elisha Cook, Jr.), that their new residence was previously inhabited by Mrs. Gardenia, an elderly woman who had seemingly gone senile. Guy also discovers a dresser concealing a simple closet which contains nothing except a vacuum cleaner and a few other household items. Their friend Hutch (Maurice Evans) tries to dissuade them from taking the apartment, informing them of some of the Bramford's rather unseemly history but, undeterred, Rosemary and Guy move into the building.
Ángela Vidal (Manuela Velasco), and her cameraman, Pablo, are covering the night shift in one of Barcelona's local fire stations for the documentary television series While You're Sleeping. While they are recording, the firehouse receives a call about an old woman, Mrs. Izquierdo, who is trapped in her apartment and screaming. Ángela and Pablo accompany two of the firefighters, Álex and Manu, to the apartment building, where two police officers are waiting. As they approach the old woman, she becomes aggressive and attacks one of the officers, biting his neck.
Anita "Needy" Lesnicki, once an insecure and bookish teenager living near Devil's Kettle, Minnesota, is now a violent mental inmate who narrates the story as a flashback while in solitary confinement. She has been friends with a selfish and popular cheerleader, Jennifer Check, since childhood, despite having little in common. One night, Jennifer takes Needy to a local dive bar to attend a concert by indie rock band Low Shoulder. A suspicious fire engulfs the bar, killing several people, and Jennifer, who is in shock, agrees to leave with the band despite Needy's protests. Later that evening, Jennifer, covered in blood, appears in Needy's kitchen and proceeds to eat food from the refrigerator. Unable to digest the matter, she vomits a trail of black, spiny fluid and then leaves in a hurry as Needy calls after her.
A small group of Roman Catholics believe Satan intends to become man just as God did in the person of Jesus. Writings from a seemingly-possessed psychiatric patient lead them to Peter Kelson (Chaplin). The group suspect it is Kelson's body Satan has chosen to occupy. The youngest of the group, Maya Larkin (Ryder), meets Peter to investigate further and try to convince him of embodied evil. Other signs come to Kelson as he and Maya take a journey full of strange occurrences, self-discovery and an ultimate showdown.
Philip Lamont, a priest struggling with his faith, attempts to exorcise a possessed South American girl who claims to "heal the sick". However, the exorcism goes wrong and a lit candle sets fire to the girl's dress, killing her. Afterwards, Lamont is assigned by the Cardinal to investigate the death of Father Lankester Merrin, who had been killed four years prior in the course of exorcising the Assyrian demon Pazuzu from Regan MacNeil. The Cardinal informs Lamont (who has had some experience at exorcism, and has been exposed to Merrin's teachings) that Merrin is up on posthumous heresy charges due to his controversial writings. Apparently, Church authorities are trying to modernize and do not want to acknowledge that Satan as an actual evil entity exists.
Five Michigan State University students, Ash Williams (Bruce Campbell) and his girlfriend Linda (Betsy Baker), accompanied by Ash's sister Cheryl (Ellen Sandweiss), their friend Scotty, and his girlfriend Shelly , venture into the Tennessee hills to vacation in an isolated cabin for their spring break. They soon run into trouble, first narrowly avoiding another motorist, then having a sudden scare as the bridge near the cabin begins to collapse as they cross. That night, while Cheryl is making a drawing of a clock, her hand becomes violently possessed by a mysterious entity, causing her to draw a picture that looks like a deformed, evil face. She fails to mention the incident to the others, dismissing it as her imagination.
A week after the burial of Robert and Katherine Thorn, archeologist Carl Bugenhagen (Leo McKern) learns of the survival of their adopted son Damien. Confiding to his friend Michael Morgan (Ian Hendry) that Damien is the Antichrist, Bugenhagen attempts to convince him to give Damien's guardian a box containing the means to kill Damien. As Morgan is unconvinced, Bugenhagen takes him to some local ruins to see the mural of Yigael's Wall, which was said to have been drawn by one who saw the Devil and had visions of the Antichrist as he would appear from birth to death. Though Morgan believes him upon seeing an ancient depiction of the Antichrist with Damien's face, both he and Bugenhagen are buried alive as the tunnel collapses on them.
After being pulled through a time portal, Ash Williams (Bruce Campbell) lands in A.D. 1300, where he is soon captured by Lord Arthur's (Marcus Gilbert) men, who suspect him to be an agent for Duke Henry (Richard Grove), with whom Arthur is at war. He is enslaved along with the captured Henry, his gun and chainsaw confiscated, and is taken to a castle. Ash is thrown in a pit where he fights off a Deadite and regains his weapons from Arthur's Wise Man (Ian Abercrombie). After demanding Henry and his men be set free (as he knew Henry was innocent, and his persecution was simply a witch hunt) and killing a deadite in full view of everyone, Ash is celebrated as a hero. He also grows attracted to Sheila (Embeth Davidtz), the sister of one of Arthur's fallen knights.