[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/die_fuersten_der_dunkelheit.jpg]]
[[caption-width-right:300:''"I've got a message for you, and you're not going\\
to like it. Pray for death."'']]

->''"You will not be saved by the Holy Ghost. You will not be saved by the god Plutonium. In fact, YOU WILL NOT BE SAVED."''
-->-- '''Satan'''

''Prince of Darkness'' (1987) is Creator/JohnCarpenter's second film in his "Apocalypse Trilogy", after ''Film/{{The Thing|1982}}'' (1982) and before ''Film/InTheMouthOfMadness'' (1994). It's a slow-paced, atmospheric, creepy and [[MindScrew mindscrew]]-y little film that isn't mentioned very often but is nevertheless an important piece of Carpenter's filmography.

A Catholic priest dies and a strange canister with a green, swirling liquid in it is found in the basement of an abandoned church. Another priest (Creator/DonaldPleasence) asks an old acquaintance, quantum physicist Professor Birack (Victor Wong), to investigate the mystery of the canister. The priest claims that the liquid in the canister is in fact the corporeal form of an ancient evil, which is starting to reawaken and influence the world around itself. He wants for Birack to prove this scientifically, so that they can warn the world. To this end, Birack brings several of his students and fellow scientists of various fields to the church to study the canister, and they discover that it is seven million years old and can be opened only from the inside.

However, when the green liquid starts to come out of the canister and possess the various scientists, and crazed homeless people surround the church and kill everyone who tries to leave, not only do Birack and company have to run for their lives, but also to try to avoid the oncoming apocalypse.

Not to be confused with [[{{Satan}} that other prince of darkness]] (although he is, in a way, the main character). Or [[Music/OzzyOsbourne that other one]]. Or [[UsefulNotes/PeterMandelson that other one]]. Or [[Creator/BillHicks that other one]]. Or [[Film/DraculaPrinceOfDarkness that one Dracula film]].

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!!This film provides examples of:
* AllThereInTheScript: The priest is unnamed in the film, but is named "Father Loomis" in the script.
* AmazingFreakingGrace: Sung by the possessed [[spoiler:Calder.]]
* AmbiguousEnding: Whether the heroes truly succeeded in sealing the evil in another realm is left unclear. Was the final dream really just a dream this time? Or did they [[spoiler: merely change the future to something just as vaguely apocalyptic]]? Even the final shot is ambiguous — is anything going to happen when he touches the mirror?
* AncientConspiracy: The Brotherhood of Sleep, an order of Catholic priests who kept the secret of the canister for centuries.
* AgentScully: Walter and Wyndham.
* AntagonistTitle: The "Prince of Darkness" aka {{Satan}} is a malevolent disembodied presence who starts a zombie plague against the human protagonists. However, it turns out that he is merely the foot soldier of an entity far more terrifying and a threat to reality itself — ''[[EldritchAbomination the Anti-God]]''.
* {{Antichrist}}: It is also {{Satan}}, it seems, and wants to summon his father, the ''Anti-God''. It appears in liquid form and may also exist at a sub-atomic level. It's all a big MindScrew.
* TheAntiGod: The "Anti-God", a GodOfEvil[=/=]EldritchAbomination based on the idea of matter/antimatter. It's also the father of {{Satan}} (who is apparently also TheAntichrist).
* AsianAndNerdy: Somewhat justified with Professor Birack (and downplayed with Walter and Lisa), considering that all of the major characters are academics.
* BedmateReveal: Right before the ending, luckily it was AllJustADream (...[[MindScrew probably]]).
* BeethovenWasAnAlienSpy: In this film's mythology, Jesus was a HumanAlien and the Catholic Church covered it up.
* BigRedDevil: It's hard to tell, but when [[spoiler:the hand of the Anti-God reaches out, it's bright red with black nails/claws,]] implying that the Anti-God resembles our traditional image of Satan more than the actual [[BlobMonster Satan in the film.]]
* BittersweetEnding: Our heroes [[spoiler:are successful in preventing the Anti-God from escaping its prison, thus stopping the inevitable apocalypse had he escaped, but in the process many innocent lives were lost in order for it to be sealed back up. Plus it’s implied that the Anti-God may escape again in 1999. [[FromBadToWorse To add more insult to injury]], Cathrine is trapped inside the Anti-God’s prison and is the new vessel for it.]]
* BlobMonster: More of a liquid type than most, but is very amorphous and sapient just the same.
* BodyHorror: The Chosen One, [[spoiler:Kelly]], appears more and more [[TransformationOfThePossessed rotten and decayed as time goes by.]]
* BrokenSmile: Calder smiles while possessed, through tears and while clearly devastated.
* BugsHeraldEvil: One of the first signs that things are starting to go to hell is vermin showing up in the windows, crawling all around the area and even [[TheWormThatWalks taking up the shape of the recently deceased]] [[spoiler:[[TheWormThatWalks Wyndham]]]] [[TheWormThatWalks to deliver a warning]]. [[spoiler:It's revealed to be Satan exerting some psychic influence outside of his prison as he starts breaking out]].
* CameBackWrong: After being killed, [[spoiler:Wyndham]] is revived under the control of Satan, being brought back as a MouthOfSauron [[TheWormThatWalks controlled by a swarm of black bugs]].
* TheChosenOne: A very dark example. [[spoiler:Kelly]] is chosen by Satan to become his primary vessel after being freed, allowing him to free the Anti-God.
* ConvenientlyPreciseTranslation: Lisa deciphering the ancient message in the book.
* CorruptChurch: The Brotherhood of Sleep.
* TheCorruption: Satan acts something like this.
-->'''Birack:''' Suppose what your faith has said is essentially correct. Suppose there is a universal mind controlling everything, a god willing the behavior of every subatomic particle. Well, every particle has an anti-particle, its mirror image, its negative side. Maybe this universal mind resides in the mirror image instead of in our universe as we wanted to believe. Maybe he's anti-god, bringing darkness instead of light.
* CosmicHorrorStory: More so than ReligiousHorror, despite the overtones.
* CrystalDragonJesus: Jesus was an alien trying to explain all of this to everyone. The Church basically turned His instructions into a moral code.
* DemonicPossession: Sort of. More specifically, Satan infects people with smaller particles of himself, and without him, [[spoiler:the smaller pieces can't live]].
* DidntThinkThisThrough:
** While hiding in a closet, Walter idly sits around snarking for hours while his friends try to bust down the wall and free him, instead of using his large, heavy flashlight to help by knocking the wall out from his end. By the time it does occur to him to try it, his possessed cohorts are within moments of breaking into the closet and grabbing him.
** Catherine throws herself in the mirror dimension in order to take the Satan-possessed Chosen One with her. The problem is that, given that the Chosen One was giving her back and just slowly reaching into the mirror, Catherine could have simply pushed her into it without having to enter herself too.
* DoomedContrarian: Zig-zagged. Walter and Wyndham are the only members of the group to vocally and repeatedly express disbelief for the story once Lisa translates it, while Lomax seems undecided but interested in finding out more. [[spoiler:Walter survives, Wyndham dies, and Lomax's fate is a bit ambiguous.]]
* DoubleMeaningTitle: "The Prince Of Darkness" is one of Satan's most well-known nicknames. This movie offers a literal explanation as to why: [[spoiler:Satan is only the earthbound son of something much more serious, the "Anti-God".]]
* DreamingOfThingsToCome: How The Brotherhood of Sleep got its name, thanks to tachyons.
* DwindlingParty: The number of participant-students lessens as the movie goes along.
* DyingAsYourself: Horrifically and tragically averted. [[spoiler:Calder cuts his own throat after being infected with the liquid to prevent coming under full possession. It doesn't work and his corpse reanimates with him still left [[FightingFromTheInside Fighting From the Inside.]]]]
* EldritchAbomination: [[spoiler:The Anti-God, who is the father of Satan and the god of anti-matter who resides in a mirror universe. "Satan" in this film is pretty Eldritchy himself and mostly takes the form of green liquid.]]
* {{Expy}}: The priest is one for Dr. Loomis from ''Film/Halloween1978'', such that the character's name is "Father Loomis" in the screenplay.
* FantasticCatholicism: The Church kept the Devil prisoner in the basement of an out-of-the-way church, alongside proof that Jesus was an alien, and that the Church was meant to be a militant society on guard in case the Devil (also an alien) ever escaped his prison. Unfortunately, the Church became corrupt and started seeking power for its own sake.
* FateWorseThanDeath: "I have a message for you, and you're not going to like it: pray for death."
* FightingFromTheInside: [[spoiler:Calder]], after being possessed, desperately struggles against Satan’s control. However, he can’t do anything, and is mainly reduced to alternating between pained sobs and deranged laughter.
* [[FlingALightIntoTheFuture Fling A Light Into The Past]] / OminousMessageFromTheFuture: Scientists from the year 1999 use a tachyon signal to warn everyone who sleeps in the church of the disaster awaiting them.
* GainaxEnding: Was it a dream? A new recording from the future? What happened to Catherine anyway?
* GentleGiant: Calder is the largest and most muscular of the students, and is a friendly, earnest guy [[spoiler:before being possessed.]]
* GreaterScopeVillain: Satan, the quintessential BigBad turns out to be just TheDragon for the ''Anti-God''
* GirlOnGirlIsHot: Presented but quickly averted; after being infected by liquid Satan, [[spoiler:Susan]] bodily confronts [[spoiler:Lisa]] on a cot. [[spoiler:Lisa]] is squicked out, at which point [[spoiler:Susan]] vomits on her, allowing her mind to be controlled.
* HappilyMarried: Susan the radiologist (glasses), apparently.
* HeroicSacrifice: [[spoiler: When the Chosen One, possessed by the Antichrist, is about to summon the Anti-God from the other side of a mirror, Catherine pushes the Chosen One inside the mirror, falling into it herself, and the priest is finally able to shatter the mirror with an axe and to trap the evil in the other dimension forever: along with Catherine]].
* HopeSpot: It initially seems as though Etchinson, a minor student, might avoid the supernatural happenings, as it's quickly established that he's only there to help set up the equipment and then will be leaving. [[spoiler:Instead, upon leaving, he becomes the first victim, being ambushed by the possessed hobos]].
* IdiotBall: While hiding in a closet, Walter idly sits around snarking for hours while his friends try to bust down the wall and free him, instead of using his large, heavy flashlight to help by knocking the wall out from his end (the [=MagLite=] flashlight he's using is shock-resistant and can even function as a billy club, so it could handle the abuse). By the time it ''does'' occur to him to try it, his possessed cohorts are within moments of breaking into the closet and grabbing him.
* ImprobableWeaponUser: Hobo-Music/AliceCooper impales Etchinson with a broken bicycle.
* ImpaledWithExtremePrejudice: [[spoiler:Etchinson]], with a ''bicycle'', no less!
* JustThinkOfThePotential: After the translated text has some of the others disbelieving or freaked out, Calder (and to a lesser extent Lomax) want to stay, feeling that they're "on the brink of the ultimate truth."
* LaughingMad: [[spoiler:Calder]]'s unnerving laughing after being possessed veers between maniacal giggles and piteous sobbing.
* LeakingCanOfEvil: Satan is [[SealedEvilInACan trapped inside a glass cylinder]] inside a church. It sprays a liquid at one of the people researching it and takes control of them, then has that person spit the liquid at other people to possess them as well. It also uses MindControl on street people who live near the church to surround it and trap the researchers inside.
* MadnessMantra: [[spoiler:Lisa]] writes one of these on a computer after being possessed.
** ''I live! I live! I live! I live! I live! I live! I live! I live! I live! I live! I live! I live! I live! I live! I live! I live! I live!''
* MagicalHomelessPerson: The homeless are controlled by the devil, indicating they're at least more susceptible to the supernatural.
* MagicVersusScience: Averted. The priest seeks the aid of science to understand and combat the malevolent supernatural force in the Church's basement. The scientists' individual reactions vary from denial (presented as individual and irrational, not scientific at all) to unquestioning acceptance, but on the whole they simply accept that something weird is going on and try to figure it out, even incorporating such unusual data as strange dreams and feelings and impossible test results.
%%* MindScrew
* MirrorUniverse: The Devil wants to summon his father the Anti-God from the other side of a mirror. We only get to see a big ugly hand, though.
* NamesToRunAwayFromReallyFast: The Anti-God.
* NiceGuy: Calder, [[spoiler:making his fate all the more horrific and tragic.]]
* NoNameGiven: Officially, the priest. The fans of the film give him the moniker "Father Loomis."
** Not just fans; the priest's name is "Father Loomis" in the screenplay and the closed captioning subtitles refer to him as "Father Loomis" as well.
* NoSuchThingAsSpaceJesus: Inverted: The book of prophecies pretty much says that Jesus was an alien who fought the Devil, also an alien.
* NothingIsScarier: We are never shown more of the Anti-God than its demonic hand and the glimpse of the world it inhabits looks like an underwater black void. The finale is unexplained, possibly a dream sequence, and cuts in a cliffhanger just before [[spoiler:Brian touches the mirror.]]
* NukeEm: The message "You will not be saved by the god Plutonium" makes it clear that the Anti God cannot be stopped with nuclear weapons.
* OrificeInvasion: The green liquid possesses people by jumping into their mouths.
* OurZombiesAreDifferent: A combination of {{Technically Living Zombie}}s, a corpse filled with a swarm of beetles and bugs that delivers a message before disintegrating, and a demon possessed rotted body that can reassemble itself and regrow limbs.
* PluckyComicRelief: Walter and Professor Leahy serve as the primary source of humor in an otherwise grim movie.
* PornStache: Brian has an [[http://1.bp.blogspot.com/_LZ92yTgKeAQ/RjYSb-oZ_0I/AAAAAAAAA8U/g6_SSPkD9gE/s1600-h/prince5.jpg epic]] example.
* RealLifeWritesThePlot: Supernova 1987-A was incorporated into the film, though it has nothing to do with the story save as an ominous portent and its tenuous connection to quantum physics.
** It’s implied the supernova was caused by Satan, as one of the signs of his awakening.
* RecurringDreams: Everyone involved with the Brotherhood of Sleep and/or the canister experiences the same eerie dream about a mysterious cloaked figure standing in front of the church... except it is not a dream, but ''a broadcast from the future that uses brain waves as a signal to be transmitted'' and may or may not be a warning from Alien Jesus about the risks of letting the evil escape.
* ReligionIsRight / ReligionIsWrong: ZigzaggingTrope between the two. The priest is understandably distraught about the true nature of Christ and Satan; Professor Birack points out that what he believed all along is ''essentially'' correct.
* ReligiousHorror: Again, sort of.
* RunningGag: No one seems to know who Susan is without being prompted "Radiologist, Glasses".
* ScaryBlackMan: [[spoiler:Calder after being possessed. He has a very unnerving evil giggle.]]
* ScrewThisImOuttaHere: Wyndham (although not so much out of fear as out of disbelief in the situation) attempts this, after Calder and Lomax fail to persuade him otherwise. [[spoiler:He doesn't get far before the possessed homeless people appear.]]
* SealedEvilInACan: One of the most literal examples.
* ShoutOut:
** The film is Carpenter's big homage to the works of Creator/NigelKneale. References range from the obvious - Brian is a transfer from [[Creator/NigelKneale Kneale College]] - to the thematic - Kneale's stories often feature traditionally "occult" things being investigated by scientists, especially ''Film/TheStoneTape'', probably this movie's biggest influence. Carpenter even uses Martin Franchise/{{Quatermass}} as a screenwriting alias, and in the original press release actually described "Martin" as the younger brother of Bernard Quatermass.
** Wyndham is named after Creator/JohnWyndham of [[Literature/TheDayOfTheTriffids Triffids]] fame, and Susan Cabot after the titular star of ''The Wasp Woman''.
** Catherine Danforth is probably named after Danforth from ''Literature/AtTheMountainsOfMadness'', as Carpenter often references the Franchise/CthulhuMythos in character and placenames.
** The famous "You will not be saved" quote is likely an allusion to Stephen Vincent Benet's "[[https://allpoetry.com/Nightmare,-With-Angels Nightmare, with Angels]]," itself a poem about how technological and philosophical progress will not save humanity from its worst instincts.
* SuperSpit: Zombies can spray the green liquid into the mouths of other humans and turn them into zombies.
* TechnicallyLivingZombie: A horde of violent mindless homeless people with Music/AliceCooper as their frontman and the students and researchers infected and controlled by the evil from the tank.
* TemporalParadox: The tachyon emission states near the end that it is proof against causality, meaning it'll remain the same even if the future is altered. Granted, the full message is only heard in Brian's dream at the end, so it could just be a subconscious, not real, message.
* TrickedOutTime: What the broadcast is intending ("You are seeing what is actually occurring for the purpose of causality violation.")
* TunelessSongOfMadness: Exposed to the liquid, [[spoiler:Calder]] is reduced to singing "Amazing Grace" at the top of his voice, before tearing his throat out.
* UnexpectedlyRealMagic: Brian, an amateur magician who is constantly practicing a "make the card disappear behind the magician's hand" sleight of hand trick, suddenly, and quite accidentally makes the card disappear ''for real''.
* VillainSong / TheVillainSucksSong: Alice Cooper (who plays the Street Schizo) composed a song for the film called [[https://www.youtube.com/watch?v=3gBAnFUHFog Prince of Darkness]] (which can be heard faintly in [[spoiler:Etchinson]]'s headphones right before he's killed by Cooper's Street Schizo character). It tells of the titular Prince Of Darkness (the central antagonist of the movie) and his monstrous evil, retelling his story from Biblical times.
--->''Prince of Darkness!''
--->''Studies the world with hungry eyes''
--->''Prince of Darkness!''
--->''Ready to baptize you in lies''
--->''Heart of evil''
--->''Soul of blackness''
--->''Prince of Darkness!''
* WhatHappenedToTheMouse: It's unclear if [[spoiler: Lomax, Susan, Lisa and Leahy]] survive their wounds when the possession is being lifted, or whether the possession itself was fatal.
* WhatHaveIBecome: [[spoiler:Calder]] takes a moment while stalking Fr. Loomis to look at himself in the mirror, and his unnerving giggles start to resemble sobs.
* WidescreenShot: It's John Carpenter. The movie is full of them.
* TheWorldIsNotReady: The Church's justification for hiding the truth about their origins.
--> '''Fr. Loomis''': Why weren't we told the truth?\\
'''Birack''': Without the technology to confirm it, it would've been another legend.\\
'''Loomis''': But he was ''our'' prisoner, not yours!
* TheWormThatWalks: [[spoiler:Wyndham]] is killed by the hobos; later he returns to give his former colleagues a creepy message, and then it's revealed that his dead body is kept together by swarms of black bugs, that then scuttle away, letting the corpse to fall apart. Or they were waiting to the last minute to finish eating him after he delivered his message.
* YouHaveToBelieveMe: Averted. The priest asks "Don't you ''feel'' it?", and the scientists admit that they do. They have no idea ''what'' they're feeling, but they immediately set out to find out.

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