* [[BannedInChina Banned In Australia]]: [[http://uk.ps3.ign.com/articles/115/1152077p1.html According to this article,]] Australia's censors have banned the game due to the graphic violence in the fatalities. It's banned to such a point that they have the border patrol on the lookout for attempts to import the game. This could have been averted if they bit the bullet and introduced an R18+ for games, but that's a contentious issue.
** It's also Banned In Germany. However, importing "banned" games isn't a big problem here.
** Sheeva's ending in the game pokes fun at this controversy.
** Following the introduction of an R18+ rating for video games in Australia in early 2013, the "Komplete Edition" has received approval and can legally be sold locally, as well as imported.
* DevelopmentGag: The younger Sub-Zero (Kuai Liang, aka the younger Sub-Zero), according to his bio, went by the {{code name}} of Tundra before taking up his brother's title. Tundra was [[WhatCouldHaveBeen the original name considered for Sub-Zero]].
* ExecutiveMeddling: Kratos's different animations for when he falls victim to certain fatalities was a design decision which, according to Ed Boon, was requested by Sony Computer Entertainment as they didn't want to make him look weak.
* FanNickname:
** [[spoiler:Cyb-Zero]] for... [[CaptainObvious guess]].
** [[http://www.youtube.com/watch?v=uyOzzd53ssY "Portal Kombat":]] The release date of the game itself, simply for coinciding with that of ''VideoGame/{{Portal 2}}''[='=]s; the temptation to switch out the "M" in "Mortal" for a "P" proved to be too great.
*** Scorpion and Noob Saibot's second fatalities and the latter's Babality wouldn't seem too out of place in the Aperture Science Enrichment Center.
** [[VideoGame/MarvelVsCapcom3 Gravity Squeeze]] for Ermac's "Cannonball Slam" X-Ray Move, due to its aesthetic similarities to [[Franchise/{{X-Men}} Magneto]]'s [[LimitBreak Level 3]] in ''[=MvC3=]''.
** Kittentaro: Kintaro's more feline appearance in this game (he more closely resembled a tiger in ''Armageddon''). Can also be applied to his Babality.
** ''Mortal Kombat 9'' itself is a Fan Nickname, as the game's official title is ''[[RecycledTitle Mortal Kombat]]''. Depending on what community you're a part of, ''Mortal Kombat 2011'' is also a common nickname.
** Thunder Idiot or God of Blunder for Raiden due to his many IdiotBall moments throughout the game.
** Raidude (used by Johnny once in Story Mode) also seems to be picking up in certain circles.
** Cyblax for Cyrax's human form; used primarily by the game's competitive community, as Cyrax's human and robot forms have subtle but game-altering differences in their movesets.
* FlipFlopOfGod: In development, earlier reports noted that the Sub-Zero in this game was [[Characters/MortalKombat1 Bi-Han, the elder Sub-Zero]]. Sub-Zero's vignette and [[http://www.gamespot.com/ps3/action/mortalkombat9/video/6284305/mortal-kombat-sub-zero-gameplay-movie combo video]] showed that it was ''[[Characters/MortalKombat2 Kuai Liang, the younger brother]]'' instead, [[LegacyCharacter once again taking up his brother's title]] and [[{{Revenge}} out for Scorpion's blood]]. In the end, both Sub-Zeroes (and Noob Saibot), in a way, made the cut for the game, [[spoiler:and none of them remain as ''human'' Sub-Zero: Bi-Han is killed by Scorpion and turned by Quan Chi into Noob Saibot; and Kuai Liang, the Sub-Zero of the roster, is turned into Cyber Sub-Zero. There's even a battle between them at some point.]] Of note is that both Sub-Zeroes have different costumes, and Bi-Han's one is the alternate.
* HeyItsThatSound: The "End of Rage" sound from [[VideoGame/MortalKombatVsDCUniverse the DC crossover]] comes back in several circumstances in this game.
* HeyItsThatVoice:
** Reprising their roles from ''VideoGame/MortalKombatVsDCUniverse'' are Tom Choi, Creator/RichardEpcar, Creator/PatrickSeitz, Jim Miller, Dana Lyn Baron, Ron Banks, and Creator/MichaelMcConnohie as Liu Kang, Raiden, Scorpion, Kuai Liang!Sub-Zero, Sonya, Quan Chi, and Kano. Michael also voices Ermac, whereas Patrick and Dana get another role in the form of DLC characters [[Franchise/ANightmareOnElmStreet Freddy Krueger]] and Skarlet.
** Creator/JamiesonPrice is Bi-Han!Sub-Zero/Noob Saibot, and the announcer.
** Creator/MatthewMercer is Stryker.
** Terrence "T.C." Carson ([[VideoGame/UnrealTournamentIII Othello]], [[WesternAnimation/StarWarsTheCloneWars Mace Windu]]) reprises his role as GuestFighter [[VideoGame/GodOfWar Kratos]].
** Gerald C. Rivers ([[VideoGame/DissidiaFinalFantasy Exdeath]], [[VideoGame/StreetFighterIV M. Bison]]) is Jax.
** Creator/KarenStrassman is both Kitana and Mileena.
** Creator/LaniMinella is Sheeva and Sindel.
** Bob Carter ([[Anime/DragonBallZ Bojack]], [[VideoGame/StreetFighterIV Balrog]]) is Shao Kahn and Baraka.
** David Lodge ([[Manga/{{Naruto}} Jiraiya]], [[Manga/{{Bleach}} Kenpachi]]) is Kabal.
** Andrew Kishino ([[VideoGame/TheWorldEndsWithYou Koki]], [[VideoGame/LostPlanet Yuri Solotov]], [[WesternAnimation/GIJoeRenegades Storm Shadow]]) is Shang Tsung and Sektor.
** Jeff Pilson (former bassist of ''Music/{{Foreigner}}'', ''Music/{{Dokken}}'', and ''[[Music/RonnieJamesDio Dio]]'') is Johnny Cage.
** Ken Lally ([[Series/{{Heroes}} The German]]) is Smoke, Goro, and [[spoiler:Shinnok]].
** Henry Dittman ([[Manga/{{Naruto}} Kabuto Yakushi]]) is Rain.
** [[DescendedCreator As usual]], series co-creator Ed Boon moves his chords for Scorpion's iconic "Get over here!" and "Come here!" quotes (albeit thanks to re-used vocals from ''[=MK4=]'' onward), as well as voicing a few minor background characters on the side.
** Similarly, Raiden's gibberish yells during his Torpedo special moves are the exact same vocals from ''[=MK2=]'' and ''Trilogy''.
* IKnewIt:
** Seeing as ''[[VideoGame/MortalKombatDeception Deception]]''[='s=] Konquest mode established that Kenshi (the {{blind|Weaponmaster}} [[HandicappedBadass swords]][[DisabilitySuperpower man]] from ''[[VideoGame/MortalKombatDeadlyAlliance Deadly Alliance]]'' and one of the few {{Ensemble Darkhorse}}s from the post-''[=MK3=]'' era) had been around since the time of the first game (he had apparently MissedTheCall for joining the tournament, and thus missed his chance to enact his revenge on Shang Tsung), many assumed that he had a good chance of making it onto the roster here. He was confirmed as [[DownloadableContent DLC]].
** There had also been a fan theory since the time of ''[[VideoGame/MortalKombat4 Gold]]'' (thanks to [[SuddenlyEthnicity Cyrax's ending]]) that the [[McNinja Lin Kuei]]'s ranks do not consist exclusively of Chinese people (or those of Chinese ancestry in the case of the [[UnevenHybrid Chinese-American-Cyromancer]] Sub-Zero bros., who were taken to China against their will by their father). Smoke and Cyrax's bios confirm this to be true; the former hails from Prague and [[CanonName is named]] Tomas Vrbada, while the latter is Motswana and was recruited to join the clan (so... Slavic and African [[InsistentTerminology "ninjas"]]?).
* {{Jossed}}: It had been assumed for years among the fandom that Jade's parents were Edenian nobility, thus explaining how she and Kitana [[HeterosexualLifePartners were so close during their childhood and beyond]]. In reality, Jade was actually offered as a tribute to Shao Kahn in her infant years, where she was raised alongside Kitana as one of Kahn's assassins. It's unknown, however, if this is meant to apply to the original timeline, as ''[=MK9=]'' has a few chronological deviations likely due to Raiden's actions, such as [[spoiler:Mileena being created ''during'' the events of ''MKII'' instead of being created after Shao Kahn adopted Kitana and raised alongside her as Kitana's twin sister]].
* TheOtherDarrin: Most of the [=VAs=] for the ''MK'' side from ''[[VideoGame/MortalKombatVsDCUniverse vs. DCU]]'' return here, with a few exceptions:
** The Announcer: Herman Sanchez [[note]]the announcer in the main series from ''[[VideoGame/MortalKombat4 MK4]]'' up to ''[[VideoGame/MortalKombatArmageddon Armageddon]]'' and ''vs. DCU''[[/note]] --> Creator/JamiesonPrice
** Kitana: S.G. Willie --> Creator/KarenStrassman
** Jax: Dan Washington --> Gerald C. Rivers
** Baraka: Dan Washington --> Bob Carter
** Shang Tsung: [[Series/{{Heroes}} James Kyson-Lee]] --> Andrew Kishino
** Shao Kahn: Creator/PatrickSeitz --> Bob Carter
* RelationshipVoiceActor:
** Jax[[note]]Gerald C. Rivers[[/note]], Stryker[[note]]Creator/MatthewMercer[[/note]], Noob Saibot/the Announcer[[note]]JamiesonPrice[[/note]], Shao Kahn/Baraka[[note]]Bob Carter[[/note]], and Ermac/Kano[[note]]Creator/MichaelMcConnohie[[/note]] are [[VideoGame/StreetFighterIV M. Bison, Fei-Long, the Announcer, Balrog, and Seth]].
*** Jax's and Shao Kahn/Baraka's VA also reprise their ''SF'' roles in ''VideoGame/StreetFighterXTekken'', with Kitana/Mileena[[note]]Creator/KarenStrassman[[/note]], Scorpion/Freddy Krueger[[note]]Creator/PatrickSeitz[[/note]] and Noob Saibot/Announcer being [[VideoGame/FinalFight Poison]], [[VideoGame/StreetFighterIII Hugo]][=/=][[VideoGame/{{Tekken}} Bob, and Heihachi]].
** Kano/Ermac[[note]]Creator/MichaelMcConnohie[[/note]] and Scorpion/Freddy Krueger[[note]]Creator/PatrickSeitz[[/note]], are [[VideoGame/WorldOfWarcraft The Lich King, Prince Arthas Menethil/Warchief Garrosh Hellscream]].
** Scorpion[[note]]Creator/PatrickSeitz[[/note]] and Bi-Han (Elder Sub-Zero)[=/=]Noob Saibot[[note]]Creator/JamiesonPrice[[/note]] are [[VideoGame/BlazBlue Ragna the Bloodedge and Iron Tager.]]
* TalkingToHimself:
** Creator/MichaelMcConnohie voices both Ermac and Kano.
** Creator/KarenStrassman voices both Kitana and Mileena.
** Creator/LaniMinella voices both Sindel and Sheeva.
** Creator/JamiesonPrice voices both Noob Saibot and the Announcer.
** Andrew Kishino voices both Shang Tsung and Sektor.
** Bob Carter voices Shao Kahn and Baraka.
** Ken Lally voices Smoke, Goro, and [[spoiler:Shinnok]].
** Rhasaan Orange voices Cyrax and Kintaro.
** Dana Lyn Baron voices both Sonya and Skarlet.
** Creator/PatrickSeitz voices both Scorpion and Freddy.
* ShownTheirWork: All of Freddy's attacks and combos are named after the many puns and one-liners he used in his movies.
* WhatCouldHaveBeen: Needles Kane (of ''VideoGame/TwistedMetal'' fame) [[http://testyourmight.com/threads/sweet-tooth-was-discussed-for-mortal-kombat-9.38777/ was considered]] as a guest character for the [=PS3=] version.
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