The following is a partial list of film, television, literary, and video game properties that have been adapted over the years in Orlando; being owned by Universal Studios, the park has had access to many properties to turn into houses, scarezones, and shows. Some of these may not seem like traditional properties, but they can be quite effective....

[[folder:HHN Properties]]
* 1991: ''[[Franchise/UniversalHorror Universal Classic Monsters]]'', ''Film/{{Psycho}}'', ''Film/{{Beetlejuice}}'', ''Film/TheBluesBrothers'', ''Franchise/{{Ghostbusters}}''
* 1992: ''Film/ThePeopleUnderTheStairs'', ''Film/{{Darkman}}'' [[note]]The latter property was used as an overlay of the ''Ride/{{Kongfrontation}}'' attraction.[[/note]]
* 1993: ''Film/{{Psycho}}'', ''Film/ThePeopleUnderTheStairs''
* 1994: ''Film/{{Psycho}}'', ''Film/{{Beetlejuice}}''
* 1995: ''Series/TalesFromTheCrypt'', ''[[Franchise/UniversalHorror Universal Classic Monsters]]'', ''Film/{{Beetlejuice}}''
* 1996: ''Series/TalesFromTheCrypt'', ''[[Franchise/UniversalHorror Universal Classic Monsters]]''
* 1997: ''[[Franchise/UniversalHorror Universal Classic Monsters]]'', ''Film/TheExorcist'', ''Franchise/TheTexasChainsawMassacre'', ''Franchise/ANightmareOnElmStreet'', ''Franchise/FridayThe13th'', ''Franchise/{{Scream}}'', ''Film/{{Candyman}}''
* 1998: ''[[Franchise/UniversalHorror Universal Classic Monsters]]'', ''Franchise/{{Halloween}}'', ''Franchise/TheTexasChainsawMassacre'', ''Franchise/ANightmareOnElmStreet'', ''Franchise/{{Scream}}'', ''Film/TheExorcist'', ''Film/{{Poltergeist}}'', ''Series/TheXFiles'', ''Film/{{Psycho}}'', ''Film/TheShining'', ''Film/BrideOfChucky''
* 1999: ''Film/TheMummyTrilogy'', ''[[Franchise/UniversalHorror Universal Classic Monsters]]'', ''Film/{{Psycho}}''
* 2000: ''[[VideoGame/NightmareCreatures Nightmare Creatures II]]'' [[note]]Used as an overlay of the ''Ride/{{Kongfrontation}}'' attraction[[/note]], ''[[Franchise/UniversalHorror Universal Classic Monsters]]''
* 2001: ''Film/TheMummyTrilogy'', ''[[https://en.wikipedia.org/wiki/Boogeymen:_The_Killer_Compilation Boogeymen: The Killer Compilation]]'' [[note]]This was a screening at the Horror Make-Up Show theater of a DVD that contained a big montage of clips from various slasher movies.[[/note]]
* 2002: ''Series/FearFactor'', ''WesternAnimation/HalloweenIsGrinchNight'', MarvelComics, ''Franchise/JurassicPark'' [[note]]Both Marvel and ''Jurassic Park'' were utilized much differently than the other properties on this list, as they were depicted in a much more twisted and bleaker fashion; rather than being a simple adaptation.[[/note]]
* 2003: ''Franchise/{{Halloween}}'', ''Franchise/FridayThe13th'', ''Franchise/ANightmareOnElmStreet'', ''Franchise/TheTexasChainsawMassacre'', ''WesternAnimation/HalloweenIsGrinchNight''
* 2004: ''[[Film/HouseOfWax1953 House of Wax]]'' (in the form of a house heavily inspired by the property), ''[[Franchise/UniversalHorror Universal Classic Monsters]]''
* 2005: [[Series/BuffyTheVampireSlayer The Gentlemen]] (adapted into the Body Collectors)
* 2006: ''Franchise/{{Scream}}'', ''Film/TheRing'', ''Franchise/{{Hellraiser}}'', ''Literature/TheSilenceOfTheLambs'', ''Film/{{Psycho}}'', ''Film/ThePeopleUnderTheStairs''
* 2007: ''Franchise/ANightmareOnElmStreet'', ''Franchise/FridayThe13th'', ''Franchise/TheTexasChainsawMassacre'', ''Film/{{The Thing|1982}}'' (1982), ''Film/DeadSilence''
* 2008: ''Film/{{Doomsday}}'', ''Film/EventHorizon'' (in the form of a house heavily inspired by the property), [[Series/BuffyTheVampireSlayer The Gentlemen]] (adapted into the Body Collectors)
* 2009: ''Franchise/{{Saw}}'', ''Film/ChildsPlay'', ''Film/{{The Wolfman|2010}}'' (2010), ''Film/{{Dracula|1931}}'', ''Film/{{Frankenstein|1931}}'', ''Film/{{The Thing|1982}}'', ''Film/ArmyOfDarkness'', ''Film/TheStrangers'', ''Film/MyBloodyValentine3D'', ''Film/ShaunOfTheDead'', ''Franchise/ThePhantomOfTheOpera'', ''[[Literature/TheSagaOfDarrenShan Cirque du Freak]]'', ''Film/DragMeToHell'', ''Film/{{Psycho}}'', ''Film/TheExorcist'', ''Film/{{Nosferatu}}'', ''Film/NightOfTheLivingDead1968'', ''Film/{{Scarface 1983}}'' ([[CrazyAwesome Zombie Tony Montana!]])
* 2010: ''[[Literature/HellHouse The Legend of Hell House]]'' (in the form of a house heavily inspired by the property), ''Film/ChildsPlay'', ''Series/TalesFromTheCrypt'', ''Film/{{The Wolfman|2010}}'' (2010)
* 2011: ''Film/{{The Thing|2011}}'' (2011), EdgarAllanPoe
* 2012: ''Franchise/SilentHill'', ''Series/TheWalkingDead'', ''Music/AliceCooper'', Creator/PennAndTeller, ''Film/{{Nosferatu}}'', ''[[Franchise/UniversalHorror Universal Classic Monsters]]'', ''Film/ChildsPlay'', ''Film/{{Psycho}}'', ''Film/{{Vertigo}}'', ''Film/TheBirds'', ''Film/NorthByNorthwest''
* 2013: ''Film/TheCabinInTheWoods'', ''Film/EvilDead2013'', ''Series/TheWalkingDead'', ''Film/AnAmericanWerewolfInLondon'', ''Franchise/ResidentEvil'' (specifically ''VideoGame/ResidentEvil2'' and ''VideoGame/ResidentEvil3Nemesis'')
* 2014: ''Series/TheWalkingDead'', ''Series/FromDuskTillDawn'' (the TV series), ''Series/FaceOff'' (the TV reality show), ''Film/ThePurgeAnarchy'', ''Film/DraculaUntold'', ''Franchise/AlienVsPredator'', ''Franchise/{{Halloween}}''
* 2015: ''Film/FreddyVsJason'', ''Film/{{Insidious}}'', ''Film/ThePurge'', ''Series/TheWalkingDead'', ''Film/AnAmericanWerewolfInLondon'', ''Series/TalesFromTheCrypt'', ''Film/{{Nosferatu}}'', ''[[Franchise/UniversalHorror Universal Classic Monsters]]'', ''Film/NightOfTheLivingDead1968'', ''Film/{{Psycho}}'', ''Film/TheExorcist'', ''Film/TheStrangers'', ''Film/ChildsPlay'', ''Literature/{{Carrie}}'', ''Film/{{The Thing|1982}}'', ''[[Literature/TheSagaOfDarrenShan Cirque du Freak]]''
* 2016: ''TheTexasChainSawMassacre1974'', ''Film/TheExorcist'', ''Series/TheWalkingDead'', ''HalloweenII1981''
[[/folder]]

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* CreativeDifferences: What caused the event's long-time Creative Director, J. Michael Roddy, to part after 2009.
* DawsonCasting: For obvious reasons, all of the child-aged characters in the event (such as Cindy) are portrayed by shorter adults. Usually the child characters are depicted as wearing masks in order to hide this.
* DisabledCharacterDisabledActor: The event has featured several wheelchair-bound characters that are portrayed by scare actors that cannot walk.
* DyeingForYourArt: Many scareactors and show actors have had to undergo physical changes for their characters, but the most extreme example may be for Orlando in 2010's Havoc: Dogs of War and its 2013 sequel Havoc: Derailed, where every actor (male and female) shaved their head bald to play psycho super soldiers.
* ExecutiveMeddling: The event has experienced in some form since the beginning; and in particular, it's the reason why there has been an increase in IP houses over the past couple of years.
* ExecutiveVeto:
** During the event's earlier years, there were once plans to have scare actors inside the queue line for ''Ride/ETAdventure''. When Creator/StevenSpielberg found out about this, he immediately said no.
** When the 2002 event, Islands of Fear, was held in the Islands of Adventure part of Universal Orlando, Creator/DrSeuss' widow Audrey Geisel vetoed attempts to host a scarezone in the Seuss Landing area of the park, feeling that it would be a disgrace to Seuss' family-friendly work and threatening to end the Seuss estate's partnership with Universal if it did so. They ultimately settled on Boo-Ville, a (somewhat) LighterAndSofter Halloween area that did not have any scareactors, but still maintained the same kind of creepy music and unsettling atmosphere that the rest of the event has.
** Also during 2002's event, in a rather odd instance, one veto occurred after the event had already started. Supposedly, Universal did not give Creator/MarvelComics the full details on what they were going to do with the event's "Island Under Siege" scare zone and "[[ComicBook/{{Carnage}} Maximum Carnage]]" house. When Marvel found out about the event's depiction of the heroes being brutally killed by the villains and their bodies strung up as trophies, they were less than amused. Even before Marvel got bought out by Creator/{{Disney}}, this incident pretty much ensured that Marvel's characters would never appear in the event again. [[note]]Which completely dashes the dreams of many fans of there ever being a house/scarezone centered around ''Comicbook/MarvelZombies''...[[/note]]
** A common fan discussion is on the viability of Universal's new ''Franchise/HarryPotter'' attractions for HHN, with the common statement being that Creator/JKRowling has barred the use of her properties for such uses (to the point that Diagon Alley was closed to the public during HHN Orlando in 2014, though it was open in '15). According to some, Rowling actually approves of the series being used for an adult event, and the only obstacle is the corporate side....
** When the event returned to the Studios park in 2006, the ''Ride/{{Jaws}}'' skippers created their own script for the ride that was more adult and profane, which they hoped that they would be able to use during the event. However for reasons unknown, the script ended up getting shot down by the higher-ups.
* MeanCharacterNiceActor: This is universally the case with the event's scare actors.
* MeaningfulReleaseDate: Subverted. The first night of Halloween Horror Nights 25 was originally planned to be on September 25th, and it was also going to last for 25 nights; but due to fan demand for more nights, this plan was scrapped and the event instead started earlier on September 18th, and ran for 30 nights.
* MilestoneCelebration: Special anniversary years were done for the "Sweet 16", 20th, and 25th events.
* MissingEpisode: In a sense. Up until around 2001/2002 or so, the event was not widely documented by people, and several websites that did are no longer existent (such as ''[=IOACentral=]''). Because of this, very few photos and videos of the event in its earlier years can be found, meaning that the only way to really get an understanding of what those years were like would be to listen to the stories of those who actually went back then.
** The extended version of 2015's commercial with [[Film/{{Scream|1996}} Ghostface]] has never been released due to the planned ''Scream'' house being cut from the event at the last minute.
* PromotedFanboy: Many of the A&D members at Universal Studios in Orlando and Hollywood that helm the events started out as mere Scareactors/huge horror fans.
** One of the biggest strengths of John Murdy, the head of the Hollywood event and himself a Promoted Fanboy, is getting famous fans of the Hollywood event to become [[AscendedFanboy Ascended Fanboys]] and work on houses with him. This is how we got the houses for ''Film/{{Hostel}}'', ''Film/CrimsonPeak'', ''Film/ThisIsTheEnd'', and many others.
** On a smaller scale, Latin pop singer Music/GloriaEstefan is [[OneOfUs a longtime fan of the Orlando event]], which she has attended every year since its inception. In 2012, [[http://www.bestoforlando.com/articles/Gloria%20Estefan%20Transforms%20into%20Vampire-scareactor-at-hhn-22/ they hired her as a scareactor for a day.]]
* PropRecycling: Very common, to the point of fans trying to identify what other houses and scarezones the props have been used in. Being Universal, they also get to use some movie props (such as a piece from ''Film/VanHelsing'' or a Triceratops head from ''Film/TheLostWorldJurassicPark''). Props from former attractions like ''Ride/{{Kongfrontation}}'' and ''Ghostbusters Spooktacular'' are even sometimes used.
* RecycledSet: The event has done this from time to time, one notable example being that 2010's ''Havoc: Dogs of War'' re-used many of the sets from ''The Spawning'' house from the year before it.
* ScrewedByTheLawyers: ''Bill and Ted's Excellent Halloween Adventure'' is much more limited in what it can do with its parodies now than in the past. For a long time, the show had absolute freedom in what it would lampoon, as the general assumption is that it falls under the "Parody" clause of Fair Use. Things changed in 2006, when Creator/{{Disney}} seemed to disagree and threatened to sue Universal over how the show that year utilized [[Franchise/PiratesOfTheCaribbean Jack Sparrow and Elizabeth Swann]]. The controversy only worsened when on that same year Creator/DCComics came down on Universal for its usage of [[Franchise/{{Superman}} Lex Luthor]] as the main villain of the show, and ultimately filed a cease-and-desist letter against them, which resulted in Lex Luthor being replaced by [[Film/AustinPowers Dr. Evil]] on the final night of the show. Since then, the show has avoided putting certain copyrighted characters in the spotlight for too long, instead doing things like using a celebrity as the show's main villain rather than a movie villain. This also led to them completely banning videotaping and photography of the show, so as to prevent it from getting onto the internet and attracting unwanted attention.
* SequelGap:
** 2004's ''Hellgate Prison'' house, despite being a fan-favorite, would not get a sequel until 11 years later in 2015's ''RUN: Blood, Sweat, and Fears'', which is set inside the prison.
** ''Film/ThePeopleUnderTheStairs'' was one of the houses in 1992 and 1993, with it not being until 13 years later that it got a sequel in 2006 called ''The People Under The Stairs: Under Construction''.
* SeriesHiatus: Universal Studios Hollywood for a while stopped doing HHN after 2000; and it wouldn't be until 2006 that it was brought back.
* SleeperHit: When the Orlando event first began in 1991, management was not expecting it to be very successful and were unsure if they would be doing it again the next year. The event ended up being a huge success, with lines for that year's only house, ''Dungeon of Terror'', reaching over three hours long. Its success would then of course go on to make Horror Nights a yearly occurrence.
* ThrowItIn: Jack and Chance were fully allowed to improvise heavily in 2015's ''The Carnage Returns'' show, resulting in numerous [[ShoutOut Shout Outs]] and other random fun moments.
* TooSoon:
** The reason why both Eddie and Cindy never came to be as icons. Universal was afraid Eddie would be considered too violent in light of the 9/11 attacks, so he was cut and Jack, a more fantasy-kind of villain, was brought back instead. With Cindy, she was cut due to child murders that had been happening around the area at the time.
** In the aftermath of the Pulse nightclub shooting in Orlando, Universal postponed the release of any new announcements concerning the event until July.
* ViralMarketing: Several of the event's years utilize this in advertising.
* WhatCouldHaveBeen: Many icons, houses, scarezones, and event concepts have been scrapped over the years; infamous examples include Eddie, the chainsaw-wielding horror movie addict who was changed into Jack's brother, then dumped completely due to the 9/11 attacks, Cindy being replaced by The Caretaker after a rash of child kidnappings, and an almost-finished extreme house, Extreme Fear, in 2003 that was scrapped due to fear of litigation just before the event (see below).
** Eddie would reappear with other icons in the ''Horror Night Nightmares'' house in 2006 and in the ''Horror Nights: The Hallow'd Past'' house & ''Fear Revealed'' scarezone in 2010. He received his own house, ''RUN: Hostile Territory'' (a sequel to the 2001 house ''RUN'' he was originally supposed to appear in) in 2006. The original ''RUN'' was intended to be his house before he was scrapped from the toned down event. In his original incarnation as Edgar Sawyer, he would have pulled a HostileShowTakeover and [[http://hhnmemories.tumblr.com/post/885150377/2001-opening-scaremonies killed Jack in the Opening Scaremonies]]. Whether Jack would have stayed dead is another story with how many times Edgar had to try before it stuck.
** Cindy's case is interesting, as she had a cameo in ''Scream House: Resurrection'' in 2006 and her own house, ''The Orfanage: Ashes to Ashes'' in 2010. However, Universal was considering having her ''be'' the icon for the 2010 event and aren't against the idea of having her as an icon in the future.
** In addition to having Cindy as the icon, 2002's Islands of Fear event was originally going to be even more elaborate than what the ultimate final product turned out as.
*** One notable thing is that the event would've had the park's rides be changed to reflect the theme of their respective scare zones, for instance, at Island Under Siege (Marvel Superhero Island), "The Incredible Hulk Coaster" would've been themed to the Green Goblin, "Storm Force Accelatron" would've been themed to the Kingpin and had heavy metal music playing, while "Doctor Doom's Fearfall" would have sound effects of blood-curdling screams added to the ride. At "JP Extinction", (Jurassic Park) the [[Ride/JurassicParkRiverAdventure River Adventure]] would've had extra effects added to make the ride scarier, along with having scare actors at the ride's exit. Finally, at "Island of Evil Souls" (Lost Continent) there would have been scare actors in the queue lines for "Dueling Dragons" and "The Flying Unicorn", and the vehicles of the latter ride would've been facing backwards.
*** A haunted house for ''Film/TheThing1982'' was originally going to be at this event for its 20th anniversary, but fell through due to budget cuts. It did ultimately come to life five years later at 2007's event, fortunately.
*** The original finale for the "Project Evilution" house would've included a giant Tyrannosaurus puppet.
*** Early drafts of the event included there being another comedy show inside the Sinbad theater.
*** At one point, there would have been a big nighttime show on the lagoon called "Danse Macabre".
** Concepts for an "extreme house" (a house in which, with full permission, visitors would be taken through more intense scares and scareactors would be allowed to break the cardinal rule: no touching the guests!) have been brought up for the Orlando event for quite some time. The most concrete example of this was the "Severe Fear" house for HHN 13 that was scrapped at the very last minute due to fear that someone might get injured and sue the park. The full treatment and construction documents can be found [[http://www.horrornightnightmares.com/forums/index.php/topic/2660-severe-fear-hhn-13-2003 here]]. Elements from this house treatment (the door scene, the use of live flame in a house, a chainsaw wielding drill sergeant, etc.) would be reused in future houses and scarezones.
** Early plans for 2003 had the icon being an evil Walt Disney-inspired animator that would've unleashed his creations upon the different islands, but A&D decided to take a more darker [[{{Pun}} direction]] and instead made the character a snuff film director.
** 2005's "Blood Ruins" house was originally going to be located inside the queue line for ''Dueling Dragons'', but ended up getting moved to one of the soundstages. That same year, there were also plans for there to be an eighth house that would've carried a voodoo-type theme.
** A scarezone for ''Film/ArmyOfDarkness'' was in the works for 2009's event, but cut and replaced with ''Lights, Camera, Hacktion'' due to Universal not being able to secure the license for it. A scene for the film was still sneaked into the ''Silver Screams'' house from that same year, however (via the BlandNameProduct method).
** Many Icon concepts are gone through before Univeral A&D finalizes the Icon to be used for the event. Most of these are lost to the archives but some of them eventually get used in some way, shape, or form. For example, Jack's girlfriend Chance actually had her origins as the Icon concept, Jack's EX-girlfriend Jill, in an event that would span both the main park and Islands of Adventure. Lady Luck had her origins in an earlier Icon concept as well, known as Fate (who was originally planned for the 2005 event as well).
** 2004 originally would've featured an icon called "[[PunnyName Dr. Payne]]", who also would've been involved in the ''Disorientorium'' house.
** Earlier plans for 2001 had it being a two-park event and being about Jack going up against a modern biker-gang sort of guy. Another idea is that Eddie would've been Jack all along, and that Jack merely would've been a mask on him that he would rip off.
** One concept for the Sweet 16 year had a scare zone that would've been located in "The Boneyard" and would've themed around Jack's "extended clown family". Another concept would've had there being a giant birthday cake prop with candles that would shoot fireworks off into the sky.
** Supposedly, the 2012 house Gothic, set in a medieval cathedral filled with menacing gargoyles, is based on a canceled room concept for an old house.
** Many of the masks worn by the Beasts in 2012 were based on the masks of older characters, but several of them were a more unique design. Rumor has it that these masks were part of a canceled house based on the {{Chupacabra}}.
** There were initially plans to have 2012's event return to being in both parks due to the construction for Diagon Alley and Transformers going on at the time, but the plans were ultimately scrapped.
** ''Film/AnAmericanWerewolfInLondon'' was set to be a house in two previous years, believed to be 2008 and 2012, and came close enough to completion that props and sets had to be scrapped or retooled. 2013 was when John Landis finally gave personal approval... and the positive reception to the house was enough for Landis to give approval again for the houses' return in 2015.
** 2008's house [[AlienInvasion Creatures!]] was a fun, campy house inspired by EC Comics. Set in a Southern roadhouse called the [[AdjectiveAnimalAlehouse Butchered Buck]], the house chronicled the battle between a group of rednecks and [[NarmCharm goofy]]-[[http://media.trb.com/media/photo/2008-09/42415497.jpg yet-scary aliens]]. That's all well and good. The problem? The alien costumes were too large and cumbersome and were deemed to be a safety hazard shortly before the event begun. With the exception of one creature seen behind a fence, there were nearly no creatures in the house [[NonindicativeName called "Creatures"]].
** ''Series/AmericanHorrorStory'' was one of the planned [=IPs=] for 2013, but due to creative conflicts with the show's owners, it was scrapped and replaced with an ''Film/EvilDead2013'' house.
** 2013 was going to have scarezones with a forest-type theme to tie into the "What Evil Has Taken Root?" theme that was being marketed. It ended up getting replaced when Marketing insisted on having the scarezones all be themed around ''Series/TheWalkingDead''.
** 2014 would've had an icon called the "Prop Master" that was cut for reasons unknown.
** A house based off of the movie ''Film/{{Scream|1996}}'' almost made it into 2015's event, to the point that the house had already been fully constructed and [[http://hhnrumors.com/scream-leak-ip-hhn-25/ leaked early marketing materials]] listed it as a marquee attraction. Things fell apart due to [[http://attractionsmagazine.com/rumor-queue-scream-cut-halloween-horror-nights-25/ serious creative disagreements]] between Universal and Creator/TheWeinsteinCompany, the short version being that the Weinsteins wanted the maze to be based on [[Series/ScreamTVSeries the new MTV reboot series]] while Universal's Art & Design department wanted to base it on the original movie. This led to the house being scrapped (with the scareactors getting less than two weeks' warning before rehearsals) and converted into a house based on ''Film/ThePurge''. Numerous aspects of the planned ''Scream'' house were still very noticeable in the final product.
** ''Jack Presents: 25 Years of Monsters and Mayhem'' was originally going to feature scenes from 2010's ''Catacombs'' and 2011's ''Nevermore: The Madness of Poe'' houses, but both wounded up being cut from the budget.
** A third "Sprung Tent" was to be constructed in 2015 for the ninth house; but due to budget, creatives ultimately opted to use one of the ''WesternAnimation/ShrekFourD'' theaters for the house instead.
** A house based on the films of Creator/AlfredHitchcock has been proposed multiple times in the past, but has yet to materialize.
* YouLookFamiliar: It's very common to see recurring scare actors throughout the event's years playing a different role. Even within the same year one scare actor can play multiple roles.
** Erin Nicole Cline, the main actress that portrayed Chance in ''The Carnage Returns'', also played [[Disney/{{Frozen}} Princess Anna]] in 2014's ''Bill and Ted's Excellent Halloween Adventure'' show as well as the "Ring Mistress" in the ''20 Penny Circus'' show from 2012. In the [[Ride/UniversalStudios regular daytime park]], she has also occasionally played [[Series/ILoveLucy Lucy Ricardo]].
** Likewise, one of the people that portrayed Jack in ''The Carnage Returns'' as well as the original ''Carnival of Carnage'' show has also played the [[Film/{{Beetlejuice}} title character]] from the park's former ''Beetlejuice's Graveyard Revue'' show, and also has had several roles in the Bill and Ted shows from over the years.
** Bryce Ward, one of the most known people to play The Caretaker, has also been one of the hosts for the ''Horror Make-Up Show'' and one of the people to play "Lonnie" in the former ''Ride/{{Disaster}}'' attraction.


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