[[ElGoonishShive http://tvtropes.org/pmwiki/pub/images/Mirror.jpg]]
[[caption-width:373: [[RunningGag The guy in the mirror is evil BTW.]]]]
->''"Everything that exists has a specific nature. Each entity exists as something in particular and has characteristics that are part of what it is. "A is A"... And no matter what reality he calls home, [[BigBad Luthor]] is Luthor."''
-->-- '''The Question''', ''JusticeLeagueUnlimited -- "Question Authority"''

Often a subset of BizarroUniverse, it is an AlternateUniverse where Good and Evil characterisations are reversed, but is otherwise the same as the "real" universe - except where logically derived from this change in morality. As an example, in BizarroWorld, the earth is a cube. In the mirror universe, the earth is a sphere, but TheCaptain has a cool eyepatch.

Occasionally, some other characteristic is reversed. Contrast with DarkWorld. The hero in the MirrorUniverse functions as the EvilTwin. Expect the loyal soldier to become a blithering coward, the backstabbing bastard to become a peaceful negotiator, and the bridge bunny who normally gets no lines becomes a trash-talking, lingerie-wearing, gun-toting, bisexually hyperactive ball of unleashed id. Fan-artists, drawings of Maya Ibuki like this would be welcome.

From the ''StarTrek'' episode [[TropeCodifier "Mirror, Mirror"]]. In homage to this episode, it's common for an evil mirror equivalent have a [[BeardOfEvil goatee beard]].

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!!Examples:

[[foldercontrol]]

[[folder: Card Games ]]

* The recent sets of ''MagicTheGathering'' involve a plane that transforms back and forth between its mirror opposites. Lorwyn is a bright, cheery world of eternal summer and daylight, filled with the stuff of whimsical fairytales. Then the world is abruptly transformed into Shadowmoor, stuck in perpetual twilight, and filled with the stuff of the Grimm brothers. Most inhabitants change with it, believing that they've always lived in whichever world it is (which could bring with it all kinds of metaphysical uncertainty about just how often the world changes its nature).

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[[folder: Comic Books ]]

* [[ComicBookTropes Comics]] do this all the time. TheDCU has its "anti-matter" Earth, wherein Ultraman, Superwoman, Johnny Quick, Power Ring, and Owlman (the Crime Syndicate of Amerika) are the evil duplicates of Superman, Wonder Woman, the Flash, Green Lantern, and Batman (the JusticeLeague), and Lex Luthor was the only superhero left in the world. (A later story introduced the Justice Underground, a team of heroes led by Riddler's counterpart, the Quizmaster. And following Riddler's HeelFaceTurn, Quizmaster had a temporary FaceHeelTurn.)
** The trope originated in the SilverAge with Earth-3, which was destroyed in ''CrisisOnInfiniteEarths'' but was restored later. The antimatter universe was based on this concept.
** GrantMorrison's ''JLA: Earth-2'', the graphic novel that re-introduced the "anti-matter" version of the Crime Syndicate, [[DeconstructedTrope deconstructed the trope]]: even the ''TheoryOfNarrativeCausality'' was reversed in the mirror universe, so the Justice League's attempt to save it was as doomed as the Syndicate's attempt to conquer TheDCU.
** JusticeLeague also had the Justice Lords universe - a variation on the regular DCAU in which the death of TheFlash resulted in the League/Lords becoming a totalitarism dictatorship.
** There was also one with Nazi versions of the Justice League - Superman becomes Ubermensch (the German term of which 'Superman' is one translation), Batman and Robin become Horned Owl and Fledermaus, Wonder Woman becomes Gudra the Valkyrie, Aquaman becomes Sea Wolf and Green Arrow becomes Usil.
** ''{{Exiles}}'', of the MarvelUniverse, had an issue where Galactus restored worlds instead of eating them, and the Silver Surfer was a power-hungry despot who had destroyed his own homeworld.
*** The first issue of ''Exiles'' was in a universe where Magneto was the benevolent teacher who wanted mutants and humans to live in harmony, and Professor X believed there could only be peace when humanity was eradicated.
* Archie Comics' ''Comicbook/{{Sonic the Hedgehog}}'' comic has a Mirror Universe, called variously "The Reverse Universe", "Anti-Mobius", and "Moebius". In it Dr. Robotnik/Kintobor is a veterinarian, while the Freedom Fighters fight against freedom. The Anti-Freedom Fighters all dress in black leather, and acted like a bunch of juvenile delinquents until Anti-Sonic became "Scourge" and conquered Moebius.
* Subversion: In PhilFoglio's short story "Work Ethic" found in ''{{Grimjack}}'' #40, heroes from a world in which there is only pure good and pure evil (and the heroes always win), get transported to Grimjack's world, which has a more realistically varied moral spectrum. Thus, since they see that everything is not purely good, they begin to destroy the entire town of Cynosure until Cynosure's protector sends them back to their own dimension. (Incidentally, these heroes, the Heterodyne Boys, later became the inspiration for ''GirlGenius''.)
* ''{{Transformers}}: Shattered Glass'', where the Heroic Decepticons are fighting to protect Earth and Cybertron from the powermongering of the Evil Autobots. "Till All are Gone..."
** And yes, [[http://tfwiki.net/wiki/Image:Rodimus_goatee.jpg Evil Rodimus has a goatee]].

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[[folder: Literature ]]

* In AndreNorton's ''Star Gate'' (1958), the human colonists of Gorth, seeking an AlternateUniverse version of their beloved adopted planet that has no native intelligent life, accidentally stumble into a version in which their own counterparts have used their advanced technology to enslave the inhabitants.
*The DarkReflectionsTrilogy features a literal mirror universe.

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[[folder: Live Action TV ]]

* In "Inferno", [[DoctorWho the Doctor]] was transported to a world where Britain was a military dictatorship and the UNIT characters were either evil (like Brigade Leader Lethbridge-Stewart and his EyepatchOfPower and Platoon Underleader Benton) or resignedly following orders (like Section Leader Liz Shaw and Doctor Petra Williams). The location and plot were the same (an attempt to drill into the Earth's mantle), but [[spoiler: penetration was reached and the world was destroyed. The Doctor was able to escape in time and stop his Earth's version of the project.]]
* Subverted in ''{{Stargate SG-1}}.'' A whole shipload of alternate SG-1 teams from various universes arrives. One team ends up hijacking the ''Prometheus''. Mitchell says to his double, "You don't have beards, so I know you're not from the Evil Twin Universe". It turns out that this particular team [[spoiler:comes from a universe in which Earth does not have a working Zero Point Energy module and needs one to power their defenses. So out of desperation they've contrived the conditions that caused the dimensional travel so they can steal someone else's. You'd think they'd just get all the Samanthas to work on the problem.]]
** That's actually pretty much how they solve the problem of sending everyone back.
* ''{{Charmed}}'' had a Polar Opposite World, where good and evil were reversed. The characters had to forge an alliance with their "evil" selves to get both worlds back into balance.
** An imbalance that occurred when these universes crossed caused a total {{Flanderization}} of their respective moralities; in the 'good' universe, even the most minor of infringements of law or courtesy was enough to have you (cheerfully) shot, whereas so much as the slightest gesture of kindness in the 'evil' universe would incur the same consequence. Also, it was always day in the good world, and always night in the evil one.
* The ''Star Trek'' Mirror Universe started out (in the ''StarTrekTheOriginalSeries'' that introduced it) as identical to the main universe, except that for the moral inversion between the Federation characters and their evil Empire counterparts. When the Mirror Universe was revisited in ''StarTrekDeepSpaceNine'', the correspondences were less straightforward -- the Empire had been overthrown, humans were downtrodden slaves, and the station was run by [[DepravedBisexual Kira's evil counterpart]].
** And, despite being the TropeCodifier, slightly subverted it - Spock was, as the show put it, "A man of honor in both worlds", and not strictly evil in the mirror universe despite clearly being on the side of the angels in the primary reality. Further, the Aliens Of The Week were {{Actual Pacifist}}s in both the 'normal' universe and in the Mirror Universe.
** When the prequel series ''Enterprise'' revisited it in "In A Mirror Darkly," it also completely changed its opening credits' entire mood from "Vapid Naive Hope" to "War! Conquest! ''Exploding FrickinLaserBeams!''" And then someone declares themselves new ruler of the Empire.
*** You're skipping the ninety minutes of [[MagnificentBastard magnificent bastardry]] on the part of Archer and [[spoiler:Hoshi]].
**THIS, if not actually technically the originator of the "Opposite Universe" concept (DC had at least one before Star Trek) it's certainly the one that the trope is named after, and most Mirror Universes are directly satires of the Star Trek mirror universe. The most noteable signs that a Mirror Universe is a satire or rip-off of this one is [[BeardOfEvil Spock's beard]] and [[BareYourMidriff Uhura's exposed belly]].
* In an episode of ''PowerRangersNinjaStorm'', Tori is sent into a parallel universe where the other rangers are the bad guys and the villains are good guys (the shallow, fashioned obsessed villainesses are even hippies in this universe).
* One of the many, many sphere malfunctions in ''SevenDays'', rather than sending Parker into a MirrorUniverse, actually inverted the ''real'' universe (Since the existence of parallel universes was disallowed by the show's AppliedPhlebotinum), changing Never Never Land into the seat of a tyrannical dictatorship, Ramsey into a spaced-out hippie, and reversing all writing. Parker, being morally ambiguous to begin with, was immune.
**Also, all text in this "inverted universe" is mirrored. Get it?
*** Wasn't the whole episode shot mirrored? I seem to recall, LaPaglia has a noticeable mole on the, er, right, could be left, side of his face, which was on the other side during this episode. Might recall incorrectly.
* ''TheMiddleMan'': In "The Palindrome Reversal Palindrome", the alternate-universe Middleman goes from all-American Boy Scout type to less-than-altruistic AntiHero, Pip goes from selfish brat to Catholic priest working to help the helpless, Lacey is a stripper, with Noser as her muscle, the entire world is a {{dystopia}} ruled by Fatboy Industries, and ''[[spoiler: Wendy]]'' is the BigBad. Oh, and all the male characters have beards.
*''RedDwarf'' played with the concept a few times without quite playing it straight. "Parallel Universe" had a universe where everyone's [[GenderBender gender was swapped]]. "Angels and Demons" had both good and evil versions of the crew triplicated into existence. "Only the Good..." had a universe where ''everything'' was reversed, much like the DCU's Bizarro World.

[[/folder]]

[[folder: Tabletop Games ]]

* As a direct homage to DC's Crime Syndicate, the Freedom City setting for ''MutantsAndMasterminds'' has a MirrorUniverse (Anti-Earth) in which the city is called Empire City and the Freedom League is replaced by the Tyranny Syndicate.

[[/folder]]

[[folder: Video Games ]]

* ''CityOfHeroes'' has the "Praetorians", evil world-conquering versions of the "normal" world's main heroes. Of course, it's up to the player character(s) to defeat them and ensure that they don't extend their conquests to other worlds.
** They have a Greek name, and Tyrant wears Greek-style armor, because of a legendary RealLife incident: when told of the existence of [[AlternateUniverse alternate universes]], Alexander the Great wept: "So many worlds, and we have not yet conquered one."
*** Also as a foil to the heroic Freedom Phalanx.
** The expansion ''Going Rogue'' (not to be confused with Sarah Palin's book) looks to be giving them a {{Retcon}} into more 'Justice Lords' than 'Crime Syndicate', there incidentally there is also a [[TheSyndicate Syndicate]] in Praetorian Earth. There's also good versions of several villain groups; the [[CircusOfFear soul-stealing Carnival of Shadows]] are the heroic Carnival of Light, and [[LaResistance the Resistance]] seem to be based on [[CyberPunk the Freakshow]].
** The same game featured the "Amerika Korps", who were from an AlternateHistory where, you guessed it, Hitler conquered and occupied the US.
*** Clumsily [[RetCon Ret Conned]] into the Council Empire later on, though Issue 15 brings back the most memorable character of the Amerika Korps...
* [[{{Kirby}} Kirby and the Amazing Mirror.]] However, it's similar to most of its predecessors, aside from the sidekick Kirbies that wander around.

[[/folder]]

[[folder: Web Original ]]

* In the ''LeagueOfIntergalacticCosmicChampions'', the LICC Universe is mirrored by the KILL universe.
* ''AHDotComTheSeries'' has the Mirror Crew, though we never see their home universe. They're stereotypical pure evil much like the StarTrek original, but the dynamic is quite different because the ''primary'' AH.com crew are scarcely angels themselves, it's more a case of TheSameButMore.
* In ''ProtectorsOfThePlotContinuum'', the mirror multiverse is dominated by the Sunflower Emperor and its [[MarySue Suvian]] legions, the Enforcers of the Plot Continuum.
** Also, Makes-Things had a BeardOfEvil. The Black Cats' doppelgängers were [[ReverseMole Reverse Moles]]. No word on any Mysterious Somebody, last time this troper checked.
* The RPG Net message boards recently [[http://forum.rpg.net/showthread.php?t=413172 featured]] a wonderful idea for a ''{{Discworld}}'' mirror universe. The Disc is torn by war between the scarily charismatic Last King, ruler of Ankh-Morpork and the Plains, and the all-powerful Crone, who controls the Ramtops. Between them are the Crone's former apprentice Magrat, Havelock the assassin and Samuel King-killer. And their leader, the last survivor of the Silver Horde, Rincewind Spellholder.
** Later additions included the Wizard-Killer, a bestial creature that haunts the library of the abandoned UU; Susan the Vain, who plays both sides, seeking to replace her grandfather as Champion of the Auditors; the History Monks, who presumably have decided this is all ''meant'' to happen for reasons of their own; the Chalkland Hag, who seeks to challenge the Crone and has turned a society of harmless brownies into an unstoppable army; Lady Sybil, who breeds war-dragons for the Last King and seduces others to her own ends; and Reginald Shoe, who has fled Ankh and turned Pseudopolis into an undead police state. Amongst others.
*GaiaOnline recently featured a literal Mirror Universe in the form of the Dark Reflection random item generator. [[UnluckyEverydude Unlucky Everygirl]] Kanoko get sucked into a bizzaro Gaia, and Gaians have to venture through the mirror to rescue her. Bizzaro Gaia features strange versions of the most famous Gaian NPCs. Some of these are fairly basic changes. (Agatha and Rina swapping ages, Moria and Sasha swapping clothing styles, Ian and Rufus swapping species), while others are a bit more bizarre. (Scheming con man Nicolae is now a priest, Liam has become a woman, his yaoi-bait roommate Gino has become his ''boyfriend'', and Edmund has become a huge nerd.). Various inversions of items are present as well. (Gaia-Tan has become Gaia-Sama, Grunny has become Prunny, etc...)
*''TheAllenAndCraigShow'', in [[http://www.youtube.com/watch?v=4uxiF5NO1j8 Episode 12]], features two gangsta counterparts to Allen and Craig that share many similar characteristics but have a more "urban" edge.

[[/folder]]

[[folder: Webcomics ]]

* In [[http://www.qwantz.com/archive/000035.html this strip]] of ''DinosaurComics'', where every comic is the same six images every time, an early story arc involves a mirror universe that is the same six panels... mirrored. Also, every character has goatees.
* IrregularWebcomic's "Cliffhangers" theme had [[http://www.irregularwebcomic.net/235.html a visit]] by an alternate Kolonel Haken from a mirror universe where the Nazis were good and Monty were evil. Eventually he was killed in single combat by the main-universe Haken, so the only good Nazi was a dead Nazi.
** Following the history reboot, there have been [[http://www.irregularwebcomic.net/2470.html two]] [[http://www.irregularwebcomic.net/2477.html forays]] to the evil mirror universe. Thus far, the only visible differences are the [[BeardOfEvil beards]], the arrangement of the panels, and Dr Jones Sr.'s dislike of sausages and avoidence of [[http://www.irregularwebcomic.net/2482.html puns]].
* ''InWilysDefense'' takes place in a universe where Dr. Wily would like a less exciting lifestyle, Cut Man's the hero, Dr. Light is an egotistical megalomaniac, and X is AxCrazy.
* [[http://www.shortpacked.com/d/20080801.html McAwesome]] is apparently a mirror ''shop'' of ''{{Shortpacked}}''.

[[/folder]]

[[folder: Western Animation ]]

* ''SouthPark'' parodied the ''Star Trek'' episode with their own Mirror Universe, from which visited an alternate Cartman. Exactly like the alternate Spock in "Mirror, Mirror", the alternate Cartman was bearded -- but being the moral opposite of the "real" Cartman, he was of course kind, soft-spoken, polite and gentle.
* ''DarkwingDuck'' had the Negaverse where Darkwing Duck's EvilTwin Negaduck [[MultipleChoicePast may or may not have come from]], but where he apparently rules with an iron fist. In that world, Gosalyn and Tank are sweet, Honker and the Muddlefoots are psychotic killers, and that world's version of the "Fearsome Five" are called the "Friendly Four".
* In ''BatmanTheBraveAndTheBold'', Batman travels to one of these when the Red Hood, [[spoiler:an alternate version of the Joker]], needs his assistance. He seems to enjoy repeatedly punching out the alternate version of Green Arrow a little too much...
* An episode of ''{{Arthur}}'' [[PlayingWithATrope plays]] with this trope when Arthur's third grade class from Lakewood Elementary, taught by Mr. Ratburn, goes to a Renaissance Faire and meets the third grade class from Glenbrook Academy, taught by Mr. Pryce-Jones, Mr. Ratburn's favorite teacher from his school days. Mr. Pryce-Jones is basically is a really snooty, much meaner version of Mr. Ratburn, who is just a goofy, nerdy, but well-meaning guy who has an affinity for giving a lot of homework to challenge his students' minds; Mr. Pryce-Jones seems intent on producing a bunch of snobby learning-machines, and his students behave as such, with an evil BigEater opposed to Buster, an evil SmartGuy for the Brain (his counterpart is called "I. Q."), an evil RichBitch for Muffy, and an evil UnluckyEverydude for Arthur (named "Chester"). Arthur and Buster even [[LampshadeHanging Lampshade]] the trope's use:
-->'''Arthur:''' They look familiar. Did we play soccer against those guys?
-->'''Buster:''' No way! I'd remember a bunch of goofy-looking kids like that.
* An episode of Recess had the same idea, when Principal Prickley makes them compete against a kickball team from the school where his brother is the principal. There is a [[SmartGuy nerdy kid]] like Gretchen, a typical-loser kid like Gus, a super-athletic kid like Vince, etc. This means that they are perfectly matched and it seems like one team will never beat the other. However, instead of one side being clearly "good" and the other "evil" the kids all conclude at the end that both of the principals are nuts and go off to play on the jungle gym, "Big Crusty" (which looks exactly like "Old Rusty" from the other school).
* The 6th-season {{Simpsons}} episode ''Lemon of Troy'' did the same swap, between two towns (Springfield and Shelbyville) instead of two schools. Bart and his friends all had Shelbyville counterparts, although they weren't so much evil (since Bart is not exactly good) as just antagonistic to our heroes. Milhouse and his counterpart even made friends.
-->'''Milhouse2:''' But Milhouse is my name!
-->'''Milhouse:''' But I thought I was the only one!
* The ''SwatKats'' episode "The Dark Side of the SWAT Kats" featured the titular team being warped to a dimension where they're evil (and so is their ally, Deputy Mayor Callie Briggs). The universe wasn't entirely swapped however - some major characters retained their 'correct' moral alignments. (There were other more subtle changes as well, such as the Enforcers using fixed-wing aircraft rather than helicopters.)
* ''{{MegasXLR}}'' has a version of this in its two-part "Rear View, Mirror Mirror" storyline. In this timeline, main character Coop abandoned the titular Megas shortly defeating the series' BigBad - losing his mind as boredom and battlelust sank in, culminating in the conquest of earth and several solar systems. Coop seems more offended at his alternate self being athletic and muscular (as opposed to...large) rather than evil, though.
* ''The World's Greatest {{Superfriends}}'' had such an episode, "Universe of Evil", which has its own [[http://en.wikipedia.org/w/index.php?title=Universe_of_Evil&oldid=133776382 Wikipedia entry]].
* ''BuzzLightyearOfStarCommand'' had as a minor villain the [[SarcasmMode imaginatively dubbed]] and yes, goateed, Evil Buzz Lightyear who came from a parallel universe that he had conquered.
* ''CodenameKidsNextDoor'' had one in which even the acronyms were reversed - the counterparts to the Delightful Children From Down The Lane were the Little Traitorous Dudes From Children's Defence, who opposed the iron grip of the Destructively Nefarious Kids, who were led by Numbuh -4, who had attained a goatee to make himself look even eviller. Fortunately, since the regular Numbuh 4 is brave to the point of recklessness and a strong physical fighter, Numbuh -4 was a coward and weakling. Also, Numbuh -86 was a sweet girly-girl.

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