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''Exorcist II: The Heretic'' is a 1977 supernatural horror film and the first sequel to ''Film/TheExorcist''. It was directed by Creator/JohnBoorman.

Father Lamont (Creator/RichardBurton), about to lose his faith in God, is persuaded by the Vatican to investigate the death of Father Merrin (Creator/MaxVonSydow, who appears in flashbacks) during the exorcism of Regan [=MacNeil=] (Creator/LindaBlair) four years earlier. His quest leads to the now-16-year-old Regan, who has no recollection of her demonic possession but is plagued by nightmares and is being treated by a psychiatrist, Dr. Gene Tuskin (Creator/LouiseFletcher). Upon observation, Lamont is convinced that Regan is a faith healer and explains why she might have been possessed in the first place. Lamont then visits Africa to meet Kokumo (Creator/JamesEarlJones), another victim of possession, who helps explain what attracts evil towards good and good towards evil.

All of this is explained in one of the trippiest and most bizarre films ever put to celluloid. The next sequel, ''Film/TheExorcistIII'', would notably by and large ignore the events of the film, treating it as CanonDiscontinuity.
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!!This film provides examples of:

%%* BackForTheDead: [[spoiler: Sharon]].
* CanonDiscontinuity: ''Film/TheExorcistIII'' is a continuation of the first film and just ignores this film entirely. So does [[Series/TheExorcist the 2016 series]].
* ColdHam: Richard Burton has his share of LargeHam moments in this film (and others), but at times here he approaches ''Frozen'' Ham: there are many scenes where he is totally immobile, unblinking, and barely breathing, with only his sweating showing that it isn't a still frame.
* DoesThisRemindYouOfAnything: As WebVideo/RedLetterMedia noted, the film can be seen as a superhero/supervillain origin story, much like ''Film/{{Unbreakable}}''.
* EvilDoppelganger: [[spoiler: Pazuzu appears as Regan to Father Lamont towards the end.]]
* FakeShemp: A weird example - Linda Blair only accepted to return if she didn't have to go through the make-up again. Thus whenever possessed Regan appears, it's a stand-in.
%%* {{Flashback}}
* ForgottenFallenFriend: Father Damien Karas, the hero of the original who saved Regan by sacrificing himself, is never mentioned by name, only being referenced as one of the three who died.
* GenreShift: It's difficult to say exactly ''what'' genre this film falls under, but it most definitely isn't horror.
* HallOfMirrors: Dr. Tuskin's psychiatric institute appears to have been built with "put as many reflective surfaces as possible!" as its motto.
* IdiotBall: Many examples, including -
** Dr. Tuskin calling the fire department asking what to do about the fire in the basement. They instruct her to use the fire extinguisher.
** Father Lamont trying to extinguish the said fire with a crutch
** When requesting information and help from the clerics and congregation of an Ethiopian Coptic Church, Father Lamont tells them that he's seen visions with the help of a demon. As a result, he's cursed by the priest and nearly stoned to death by the congregation.
** The Pope in this movie wants an investigation on Father Merrin's death, a thing they ALREADY know, especially because they believe him, an ''exorcist who died trying to free a little girl from demonic possession'', to be a possible satanist. Let that sink in.
** Merrin was based on [[https://en.wikipedia.org/wiki/Pierre_Teilhard_de_Chardin Pierre Teilhard de Chardin]], a forward-looking and very controversial Catholic priest whose writings have been both praised and condemned for heresy[[note]]His fellow Jesuit Pope Francis is rumored to consider lifting the "warning" against him.[[/note]], He was repeatedly condemned by his superiors during his lifetime, especially for his his writings about TheSingularity and ideas about original sin. Merrin, then, is the possible "heretic" of the title. The investigation is to detail the exact circumstances of his death (that's why they want to question Regan) because ''he is being considered for sainthood''.[[note]]As is de Chardin by some, although his cause has not yet been turned in.[[/note]]
* InformedAbility: Regan's artistic talent, especially her laughably bad drawing of Father Lamont.
* KillItWithFire: The fates of [[spoiler: the possessed girl in the opening sequence]] and [[spoiler: Sharon]].
* LargeHam: Weirdly enough, Creator/RichardBurton ''underacts'' as aggressively as he overacts in some scenes.
* LighterAndSofter: Compared to the first film. Especially when you realize that John Boorman and the producers considered its predecessor exploitative and negative (one could question why Warner Bros. executives didn't see this as a bad omen).
* AMindIsATerribleThingToRead: Dr. Tuskin decides to try a mind-reading gizmo on Regan. It all goes downhill from there.
* MindScrew: The whole friggin' movie.
* MissingMom: Adding to Howard [=MacNeil=] being absent from Regan's life, now so is Chris, who Regan says is 'away all the time'.
* MsFanservice: Linda Blair goes SheIsAllGrownUp in this movie.
* OneWomanWail: 'Regan's Theme'.
* PosthumousCharacter: [[spoiler:One of the storylines regards figuring out how Father Merrin died.]]
* PsychicPowers: [[spoiler: Regan has them. Other than that spoon-bending trick she fakes Sharon out with at the beginning of the picture.]]
* RealityIsUnrealistic: [[note]] For a certain definition of reality anyway[[/note]] Despite the name Pazuzu being incredibly silly sounding, it is the name of a real demon from ancient Mesopotamian mythology and it also happens that one of his abilities is to bring locusts during dry seasons.
* ReCut: The original rough cut of the movie was three hours long. Amongst the scenes which were deleted from the final version, there was a special effects sequence of the African church being destroyed by the demon.
** Shortly after its premiere, Creator/JohnBoorman went back to re-cut the film in response to poor audience reactions, although this version fared no better. Boorman shortened and changed the order of certain scenes, deleted lines of dialogue, changed some musical cues, and added an introduction with narration by Creator/RichardBurton.\\
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Boorman also cut all footage of Burton after his character, Father Lamont, fights Regan's doppelganger, cutting immediately to the end credits after Regan walks out of the rubble of the townhouse. This gives audiences the impression that Father Lamont dies during the climax. The only other significant change of the recut ending is that Sharon's death is not shown, leaving the viewer presuming that she survived at the end of the film. The major plot, though, is not significantly different between the two versions of the film.
* SceneryPorn: The sets and mattes are amazing to look at.
* SheIsAllGrownUp: My, how little Regan has grown. Most of the movie has her in some form of revealing clothing. And then there's the tap-dancing scene.
* SinisterMinister: Father Lamont is introduced as a well-intentioned but troubled and insecure man early on in the film. Under the demon's influence, his darker impulses become unleashed as he accompanies Regan back to the house in Washington DC where her possession occurred.
* TheSwarm: Locusts are a recurring appearance.
* TitleDrop: Kokumo says to Father Lamont 'You're a '''Heretic'''.'
* WrittenInAbsence: Ellen Burstyn didn't want to return, so Chris [=MacNeil=] is explained as being away working.
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