History Main / MirrorUniverse

* ''Comicbook/{{Exiles}}'', of the MarvelUniverse, had an issue where ComicBook/{{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.

* In ''Fanfic/TheBridge'', several good and bad {{Kaiju}} get transported to Equestria. In the spin-off ''The Bridge: Sound of Thunder'', Raiga finds herself in Equestria and thinks she will soon be reunited with Godzilla and her other friends, except it turns out she arrived in the mirror Equestria from ''ComicBook/MyLittlePonyFriendshipIsMagicIDW''. To make matters worse, the Kaiju transported to this world are from a mirror universe as well. Godzilla is a sadistic murderer instead of a hero, ''Battra'' Lea is an OmnicidalManiac instead of a guardian, etc. On the flip side, Xenilla and Destroyah are heroes instead of villains. Raiga's own counterpart is shy and meek instead of fight-happy.

*** Talon takes it further by being a LegacyCharacter. The Talon who seems to be a direct counterpart to [[ComicBook/RobinSeries Tim Drake]] actually took a HeelFaceTurn and ended up joining the Teen Titans alongside Tim before being murdered and given back to Owlman in individually wrapped pieces.

** Lastly there's [[Characters/DarkNightsMetal The Batman who Laughs]], the LaughingMad EvilTwin of Batman from an AlternateUniverse where he was poisoned with Joker Gas, went insane, and massacred the Bat-Family, turning into a terrifying supervillain. Worse still, The Batman who Laughs has all of good Batman's CrazyPrepared skills, making him all the more dangerous. Ironically it takes an EnemyMine situation between both Batman and The Joker to bring The Batman who Laughs down.

* [[ComicBookTropes Comics]] do this all the time. Franchise/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 ComicBook/{{Superman}}, ComicBook/WonderWoman, ComicBook/TheFlash, ComicBook/GreenLantern, and ComicBook/{{Batman}} (the ComicBook/JusticeLeagueOfAmerica), and ComicBook/LexLuthor was the only superhero left in the world. A later story introduced the Justice Underground, a team of heroes led by Comicbook/TheRiddler's counterpart, the Quizmaster, and based on the various evil groups faced by the Justice League (such as the LegionOfDoom, the Injustice Gang/League and the Secret Society of Supervillains). Other members of the group included Sir Solomon Grundy (a dapper and intelligent [[Characters/GreenLantern1941 Solomon Grundy]]), General Grodd ([[Characters/TheFlashRoguesGallery Gorilla Grodd]]), Lady Sonar (Sonar), Q Ranger (Major Force) and a heroic version of Star Sapphire. Following Riddler's temporary HeelFaceTurn, Quizmaster had a temporary FaceHeelTurn in ''Comicbook/Trinity2008''.
** ''Comicbook/ForeverEvil2013'' and it's lead-up introduced two new Crime Syndicate members: Atomica, an evil version of Comicbook/TheAtom, Grid, an evil version of Comicbook/{{Cyborg}} and Sea King, an evil version of Comicbook/{{Aquaman}}. Owlman was also assisted by the Outsider, an evil version of Batman's BattleButler Alfred.

** The 2021 ''Comicbook/{{Crime Syndicate|2021}}'' mini-series introduces a new take on the team that explores Earth-3 in greater detail. The core group once again includes Ultraman, Superwoman, Emerald Knight (the [[AdaptationNameChange renamed]] Power Ring, who is now a John Stewart analogue once again), Johnny Quick and Atomica, while Earth-3's Comicbook/{{Vixen}} and Red Star counterparts appear for the first time.
*** The animated ''WesternAnimation/JusticeLeague'' also had the Justice Lords universe - a variation on the regular DCAU in which the death of ComicBook/TheFlash resulted in the League/Lords becoming a totalitarian dictatorship. The arc began life as a movie about the Crime Syndicate, but was retooled to a more iron-fisted Justice League. Without explicit ties to any past work, the original idea finally saw light years later as ''WesternAnimation/JusticeLeagueCrisisOnTwoEarths'', which applied the concept to a large amount of Justice League characters. In addition to the primary Crime Syndicate members, Mirror Universe versions of Comicbook/MartianManhunter, Hawkgirl, Comicbook/GreenArrow, [[Comicbook/{{Shazam}} the Marvel Family]], Justice League Detroit, Comicbook/TheOutsiders and others are also seen. A heroic version of Comicbook/TheJoker called the Jester shows up at the beginning, while the American president is [[Comicbook/{{Deathstroke}} Slade Wilson]].
** The idea is also used with the Injustice Syndicate in ''WesternAnimation/BatmanTheBraveAndTheBold''. In addition to Owlman, the group includes Scarlet Scarab (Comicbook/BlueBeetle, specifically the Jaime Reyes version), Barracuda (Aquaman), Blaze (Fire), Blue Bowman (Green Arrow), Dyna-Mite (the Atom, specifically the Ryan Choi version), Rubber Man (Comicbook/PlasticMan) and Silver Cyclone (Comicbook/RedTornado). Their enemies are the Justice Underground, whose ranks include the Red Hood (the Joker), Yellow Lantern (Sinestro), General Grodd ([[Characters/TheFlashRoguesGallery Gorilla Grodd]]) and unnamed heroic versions of C and D-list villains like Clock King, Kite-Man and Gentleman Ghost.

** Lastly there's [[Characters/DarkNightsMetal The Batman who Laughs]], the LaughingMad EvilTwin of Batman from an AlternateUniverse where he was poisoned with Joker Gas, went insane and massacred the Bat-Family, turning into a terrifying supervillain. Worse still, The Batman who Laughs has all of good Batman's CrazyPrepared skill making him all the more dangerous. Ironically it takes an EnemyMine situation between both Batman and The Joker to bring The Batman who Laughs down.

** Played with in the ''ComicBook/MarvelZombies'' universe; the heroes are all evil, but only because they succumbed to a ZombieApocalypse and proceeded to devour most of the human race, though they are [[OurZombiesAreDifferent sentient zombies]] who take sadistic pleaure in ripping their [[ImAHumanitarian meals]] apart. Magneto and Doctor Doom show up as their enemies and help rescue survivors, but mostly in the context of them being NobleDemon types who [[EvilVersusOblivion object to rampaging malevolent zombies]] [[ApocalypseHow wiping out the entire universe]]. The cause of mutant supremacy doesn't matter much when most mutants and non-mutants have made peace with each other and decided just to eat everyone else.

** The interference from the heroes' world has caused the parallels to break down a bit; Scourge has been turned green, and hooked up with [[FaceHeelTurn Fiona Fox]] for a while, Anti-Bunnie has pulled a HeelFaceTurn and wears [[PoweredArmor Omega Armor]] instead of being a {{cyborg}} (anti-Rotor is the cyborg) and anti-Antoine briefly posed as his good counterpart. Basically the [[StatusQuoIsGod status quo]] for the mirror world gets altered more often than the main one. Oh, and [[TheStarscream Miles Prower]] even has [[BeardOfEvil the goatee]].
*** Sonic has a direct evil double in the form of Scourge the Hedgehog. Unlike Shadow, who often acts as a foil to Sonic, and Metal Sonic, which is a robot built to serve Dr. Eggman's diabolical purposes, Scourge is literally an evil counterpart: He is Sonic from a parallel dimension, where the protagonists and villains switch roles. In the early days of the comic, Scourge was simply known as "Anti-Sonic" and was identical to Sonic save for sunglasses, a black leather jacket, and a JerkAss attitude. However, after some vocal exchange with Sonic, Anti-Sonic became shaken up by the thoughts and sought to make himself stand-out. TO that end, he attempted to hijack the Master Emerald. The result was becoming green, getting some scars on his chest and a form of rebirth. This is where he christened himself as Scourge the Hedgehog and he was now much more ambitious than ever before, even becoming king in his unvierse.
*** He, then, forces this on his Anti-Freedom Fighters, turning them into the Suppression Squad. Not only are they just as bad, they followed Scourge's example in changing their names from their counterparts (such as Anti-Sally calling herself Alicia) to further standout from them. Princess Sally's counterpart, Alicia, is nothing more than a figurehead. Miles, Tails' counterpart, is cold, calculating and the ''real brains'' behind the team. Rotor's counterpart, Boomer, took his genius and used it on himself, turning himself into a cybernetic terror (which also makes him Bunnie's evil counterpart) Patch, Antoine's evil counterpart, is completely vain and in it for power. {{Subverted|Trope}} with Anti-Bunnie; she ended up becoming good (kinda) when she ended up contracting NIDS and her teammates left her to die. She was saved by Dr. Kintobar via a special mech suit (resembling Omega oddly enough) and she became his bodyguard as a result while now calling herself Buns.
** ''ComicBook/SonicTheComic'' featured [[https://sonic.fandom.com/wiki/King_Sonic King Sonic]], hailing from a MirrorUniverse in which Sonic was the one who got caught in the explosion of the Retro-Orbital Chaos Compressor instead of Dr. Kintobor. As such, in the absence of Dr. Robotnik, this Sonic became the tyrant that sought to take over his universe's Mobius. He has all of Sonic's abilities with none of his redeeming qualities, and even has his own [[SuperpoweredEvilSide Superpowered Good Side]] in King Super Sonic.

** ''2000 AD'' continuity: Deadworld is a mirror image of the 'real' world which is ruled by four Dark Judges, supernatural beings who consider all forms of life to be punishable by death (their philosophy being that [[TheEvilsOfFreeWill only the living commit crimes]]). There are hints that Deadworld was more-corrupt than Dredd's world. Life was viewed more-cheaply than in Mega-City One, and the Judges wore all-black uniforms. Judge Death, still an ordinary human, joined up so he could kill people with impunity. He had already killed several classmates in secret, but on his first day on the job, he executed all 27 offenders. Eventually his philosophy started to catch on with the other Judges. There was a growing resistance movement to the Judges at this point, but the Chief Judge was too slow to act, and Judge Death overthrew him in a coup, renaming his courtroom the "Hall of ''In''justice." Also around this time, a team of undead priestesses called the Sisters of Death set up shop on Deadworld, which coincided with other problems such as crop failures. The Dark Judges attracted the attention of the Sisters and were transformed into undead creatures. After the Dark Judges outlived their usefulness, Death butchered all of them--sparing only his three closest friends, who were just as insane as he. (Judge Fuego a.k.a. Judge Fire was infamous for having burned down a school over noise violations.)

* ''ComicBook/TransformersShatteredGlass'', 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.]]
** Quintessons are tree-hugging, peace-loving, groovy lingo speaking, space-hippies. The major Quintesson character is an exile who disagrees with the usual Quintesson policy of non-interaction with races until they're deemed sufficiently advanced -- as opposed to the normal Quintesson policy of enslaving or arbitrarily executing "inferior" beings.

*** In the Italy series ''X-Mickey'' we find Mickey traveling through portals to another dimension and meeting new characters that are special for this series. Most notable is the Goofy-lookalike werewolf named Pipwolf, but we also have Manny that looks like an albino Minnie and several other characters that are recurring throughout the series.
* ComicStrip/MandrakeTheMagician has had several adventures involving a mirror universe. Usually the evil mirror-universe tries to invade the ordinary universe, coming through just about any mirror (though they prefer to begin with Narda's), since they have a spray that makes mirrors soft and permeable.

* ''ComicBook/ArchieComics'': One issue had Archie and Chuck stumble into a backwards version of Riverdale where everyone's personality (including theirs) was inverted. The most extreme case was Jughead, who goes from a practically asexual glutton to a skirt-chasing pervert who hates food so much that he ''blows up a bridge'' to stop food shipments from entering town.

* ''Fanfic/MyStupidReality'', a ''Manga/DeathNote'' fic in which the Light vs L conflict is reversed - in this universe Light is a genuinely NiceGuy who has spent all his life pretending to be ''imperfect'' and it's ''L'' that [[JumpingOffTheSlipperySlope jumps off the slippery slope.]]
* Also the ''Manga/DeathNote'' [[AlternateUniverseFic AU]] ''Fanfic/TheFacelessDisguiseOfCarnivorism''- in canon Light [[spoiler: kills L]] [[VillainWithGoodPublicity but is seen as admirable by the men he's deceived.]] In this universe Light [[spoiler: rescues L]] and is met with derision by his soldiers as they realize the AwfulTruth about what they were fighting for.

* A ''Manga/{{Bleach}}'' fanfiction features Sonoma and Kan'na. Sonoma is the original universe, introduced in the works of Tite Kubo. Kan'na is a universe created by a user, and is the parallel twin universe to Sonoma. Kan'na is war-torn, and the World of the Living is in a post-apocalyptic state, having been overrun by Hollows. Morals and standards do not exist in Kan'na, same for rules.

* In ''Fanfic/TheBridge'', several good and bad {{Kaiju}} get transported to Equestria. In the spin-off ''The Bridge: Sound of Thunder'', Raiga finds herself in Equestria and thinks she will soon be reunited with Godzilla and her other friends, except it turns out she arrived in the mirror Equestria from ''ComicBook/MyLittlePonyFriendshipIsMagicIDW''. To make matters worse, the Kaiju transported to this world are from a mirror universe as well. Godzilla is a sadistic murderer instead of a hero, ''Battra'' Lea is an OmnicidalManiac instead of a guardian, etc. On the flipside, Xenilla and Destroyah are heroes instead of villains. Raiga's own counterpart is shy and meek instead of fight-happy.

* The ''Webcomic/{{Terinu}}'' fanfic "The Grace of God" has the mainline characters drop into a parallel universe where their personalities were twisted in the worst possible direction. Leeza is the obedient military officer her father always wanted, Terinu is Mavra Chan's loyal enforcer, Melika is a SpacePirate, and Rufus warped from an honorable AcePilot to a drunk, drug addicted wreck.

* The ''Fanfic/EmpathTheLuckiestSmurf'' story "Smurfed Behind: The Other Side Of The Mirror" introduces a Mirror Universe where the Smurfs in it are [[RedAndBlackAndEvilAllOver all red-skinned, mostly wear black, and are all evil all the time]], with most of the male Smurfs being {{Depraved Bisexual}}s and Smurfette being [[ReallyGetsAround a promiscuous adulteress]] [[ParentalIncest who is married to Papa Smurf]], and where their main adversary Gargamel is always good. The Psyches, who are [[BlueAndOrangeMorality morally ambiguous]] in the normal universe, are shown to be opposites in least in being emotionally liberated instead of emotionally suppressed, and team up with the normal universe's Polaris Psyche to act as allies against the Mirror Universe Smurfs. True to the title of the story, the way to that universe and back is through a MagicMirror called the Janus Mirror, which appears in both universes as a gateway.

* ''[[https://www.fanfiction.net/s/10071646/1/Forever-Evil Forever Evil]]'' gives Owlman to Batman -- his doppelganger from a morality-inverted universe who's very much a SocialDarwinist crime boss. Interestingly, Owlman is ''much more'' openly affectionate and doting towards his sidekick than Batman. He's still a horrendous ParentalSubstitute due to his deep {{Yandere}} tendences.

* Discussed in ''Fanfic/AmbitionOfTheRedPrincess''. While the DC Comics of Naofumi's world has ComicBook/{{Superman}} and ComicBook/{{Batman}} as heroes, Motoyasu's world has Ultraman and Owlman, the evil counterparts from the Crime Syndicate, as fictional heroes. Both heroes even wonder if their own real worlds are mirror universe of each other.

* Spider Robinson's story "Mirror/rorriM Off the Wall" has an invasion by Trebor, the evil mirrortwin of Robert, a patron of Literature/CallahansCrosstimeSaloon. [[spoiler: One of the tipoff's is that Callahan's bar doesn't ''have'' a mirror normally, just quotes written behind the bar, and suddenly, there is a mirror.]]

* The "Cosmic Chess Match" arc in ''Literature/PerryRhodan'' is famous for the protagonists ending up in one of these after an experiment gone wrong. In this case it's not entirely clear whether it was a fully "legitimate" instance of the trope or an artificial creation of one of the dueling [[SufficientlyAdvancedAlien super-intelligences]]; the trigger condition for returning home ([[spoiler:Perry Rhodan himself killing his own evil double]]) and the fact that it worked basically instantly once met seem to rather hint at the latter, but [=ANTI-IT=] could have just as easily made use of an already-existing alternate universe.

* Subverted in the ''Series/StargateSG1'' episode "[[Recap/StargateSG1S9E13RippleEffect Ripple Effect]]". 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. Which is pretty much how they solve the problem of sending everyone back.]]

* ''Series/TheSuiteLifeOfZackAndCody'': Zack and Cody travel to an alternate universe in the episode "Suite Life of Success" where everything is ideal for them: Mr. Moseby is a fun-loving rule-breaking cool guy; the hotel is called "The Fitzpatrick" because Maddie is the heiress instead of London; London has Maddie's former job as candy counter girl and is the smart one while Maddie is {{The Ditz}}; Carey is a famous singer and lets the boys do everything they want; Esteban is a maid; George Clooney is on the nickle; and Arwin is Carey's manager has hair wears leather and Carey has a massive crush on him instead of vice versa.
* Parodied in ''Series/{{Community}}''. When the tossing of a die to choose who picks up some pizza creates [[ForWantOfANail seven alternate universes]], one horrible one is created where [[spoiler: Pierce dies, Jeff loses an arm, Shirley becomes an alcoholic, Annie suffers a mental breakdown, Troy's larynx is destroyed, and Britta dyes a blue streak in her hair]]. GenreSavvy Abed deduces that they're in the "evil" universe, makes them all [[Franchise/StarTrek fake beards]] and makes it their job to break into the true universe and wreak havoc.
* Polish sitcom ''Swiat wedlug Kiepskich'' has an episode where the son of the titular disfunctional family passes by the mirror in the hall and discovers that his reflection is wearing glasses, formal suit and rather nerdy haircut. After brief argument with the reflection, he finally responses with a headbutt which results in them both swapping places with each other and he ends up in an alternate universe where his family is rich, their alcoholic neighbours are tennis-playing scholars with academic degrees, and he's a world famous fiddle player. Who is about to have his biggest performance in just few hours. HilarityEnsues.

* Here's an example you might not expect: in a "The Word" segment on ''Series/TheColbertReport'' from February 10, 2007, Stephen opens with reporting on a new theory about parallel universes. In the middle of the segment, there is suddenly a cheesy science fiction zoom out, and suddenly Stephen is a left-wing hippie whose "Word" was "Troops Out Now!" After a while of seeing Hippie!Stephen's reporting, the same zoom out is shown, and you cut to "real-life" Stephen arguing in character that the US military should invade any parallel universes we find.

* Happens in the ''Series/HenryDanger'' episode "Opposite Universe" when Henry and Charlotte end up in a Mirror universe while their evil counterparts are trapped in the other, "good" universe after a tubing into the Man Cave during an electrical storm. Obligatory [[BeardOfEvil evil beards]] for Captain Man, Schwoz (kind of) and Mr Hart. Piper is a non-violent, unselfish girl.

** Our Ronnie Raymond: half of the heroic Firestorm, until his apparent death. Theirs: ''all'' of the evil Deathstorm after having wrested full control away from Martin Stein, who remains [[AndIMustScream trapped inside him, unable to even communicate by now.]] (Which may make Stein a rare person, like Barry, Iris and Joe, to be good in both worlds.)

* ''Series/DarkMatter2015'': An alternate universe is introduced in the second season episode "Stuff to Steal, People to Kill". It's not a straight example of a Mirror Universe because not everyone's moralities are reversed, but the moralities of the ''Raza'' crew (our protagonists) are. In the primary universe they were mindwiped at the beginning of the series and became subject to AmnesiacsAreInnocent, and in the alternate universe this never happened, so they are still a bunch of mass-murdering [[PsychoForHire Psychos for Hire]]. The AU crew join forces with Ferrous Corp and Emperor Ishida as a BigBadEnsemble in Season 3. The ChronicBackstabbingDisorder that crewmembers Two and Three encounter while ImpersonatingTheEvilTwin on the alternate ''Raza'' is an intentional ShoutOut to the attempted coup Kirk, [=McCoy=] and Uhura face in the ''Star Trek'' Mirror Universe. In keeping with the ''Trek'' Mirror universe episodes, the alternate ''Raza'' is also more dimly lit.
* As a show about parallel universes as the central premise, logically there will be many episodes of ''Series/{{Sliders}}'' with variants of the main characters who are evil or at least very morally questionable. Most notably however can be considered the introduction of Logan who is Quinn Mallory's [[spoiler:double, as the difference between been born a man or woman is just a chromosome]]. She was intended as a recurring villain but was vetoed by the studio. Another is the infamous "Evil Arturo" seen in the episode "Post Traumatic Slide Syndrome" which fans debate to this date whether he remained in that world or slid with the rest. Arturo is evil in several episodes tho. Rembrandt and Wade also have their share of evil or at least murkier versions.

* In 2015 ''ComicStrip/DickTracy'' launched into an arc where Sam "Trigger" Catchem and Pat Patton are goons working for "Boss" Tracy, 88 Keyes is a [[spoiler: short lived but]] honest nightclub owner, and Pruneface is the chief of police. This alt-universe is eventually [[spoiler:[[ShowWithinAShow revealed as a movie set]]]].

** The expansion ''Going Rogue'' (not to be confused with UsefulNotes/SarahPalin'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]].

* ''VideoGame/SuperPaperMario'' has the twin cities of Flipside and Flopside, which are actually connected to each other through a mirror. Flipside is the game's HubLevel with a white tower leading to seven colorful worlds, while Flopside is its dark counterpart which looks like a mirrored version of Flipside with dilapidated buildings and an Ominous Black Tower leading to TheVeryDefinitelyFinalDungeon. The Ancients constructed the two cities to be opposites of each other because light can't exist without darkness. The inhabitants of Flopside are not evil, but do have opposite personalities as their counterparts and also have different skin colors and triangular noses instead of square noses. Most residents of the two cities are unware that the other city exists, although one pair of counterparts decide to switch places with each other after they contact each other in their dreams.

* ''VideoGame/FireEmblemEngage'': This is one of the main ideas behind the "Fell Xenologue" [[DownloadableContent DLC]], as it essentially takes place in one where [[TheBadGuyWins Sombron wins]]. The Four Hounds, who are some of the main game's main villains, are the good guys and have opposite personalities to their mainline counterparts. There's also the royals, who also have opposite personalities to their mainline counterparts, like how [[TheEeyore Alcryst]] is egotistical, or how [[TheAtoner Ivy]] is corrupt tyrant. It's mentioned that their retainers, who, although long dead at this point, had the opposite personalities as the main counterparts as well. For example, [[BizarreTasteInFood Chloé]] is said to have had a PlainPalate, [[AnimalLover Merrin]] is said to have hated animals, [[TeamChef Brunet]] is said to have been a LethalChef, etc. However, [[spoiler:It turns out that the royals are actually [[OurZombiesAreDifferent Corrupted]], so whether or not these are accurate depictions and descriptions of Alternate Elyos' inhabitants while they were still alive is up for debate.]]

* ''Webcomic/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 [[http://www.irregularwebcomic.net/comic.php?current=272 killed in single combat]] by the main-universe Haken, so [[{{Pun}} the only dead Nazi was a good 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.]]

* In ''Webcomic/{{Homestuck}}'', [[ForWantOfANail Beforus serves as one for Alternia]]. At first it appears that the Beforus trolls are the GoodCounterpart to the trolls we know and love, but we soon see that they're easily capable of doing terrible things. The only difference is that they do it with a IDidWhatIHadToDo mentality as opposed to ForTheEvulz.

* The RPG Net message boards once [[http://forum.rpg.net/showthread.php?t=413172 featured]] a wonderful idea for a ''Literature/{{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.

* ''WesternAnimation/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. Hilariously, the show depicted the twins on screen at the same time with a [[StylisticSuck deliberately obvious]] SplitScreen effect. Later on, we see that Kenny is rich, Stan and Kyle are Cartman-level [[{{Jerkass}} Jerkasses]], and [[Music/IsaacHayes Chef]] is a skinny white insurance salesman.

* There's a mirror universe in ''[[WesternAnimation/CaptainNTheGameMaster CaptainN]],'' accessed by going through an actual mirror. Oddly it's not just character's alignments that are inverted. For example one lady is shown "doing laundry" by covering her clean clothes with dirt.

* The ''WesternAnimation/SWATKats'' episode "The Dark Side of the SWAT Kats" featured the titular team being warped to a dimension where their equivalents are evil (as is that of 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.)
* ''WesternAnimation/MegasXLR'' has [[BadFuture 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.

* ''WesternAnimation/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.
** Other differences include a dumb and weak-willed Numbuh -1, Numbuh -2 was also dumb but good at making jokes, Numbuh -3 is a bitch, and Numbuh -5 is a {{geek}}. Strangely, the LTDFCD still talk in unison like their main counterparts, though in [[SurferDude surfie accents]] and they still work for "Daddy", who unlike Father, is an extreme worrywart who cares a lot for his kids.

* The ''WesternAnimation/DangerMouse'' (2014) episode "Sinister Mouse'', DM meets his counterpart from a mirror universe called the Twistiverse, who is a master criminal in a red bodysuit. He is opposed by Danger Toad (Twistiverse Baron Greenback) and secretly works for [[spoiler: the evil genius Baron Penfold]]. Later episodes feature Twistiverse versions of other characters; "Twisted Sister" features a version of Professor Squawkencluck who his not only evil but, when Squawkie accidentally turns herself into a little girl, has turned herself into an old woman.

* An episode of ''WesternAnimation/PeterPanAndThePirates'' has Peter going into the CenterOfTheEarth were everything is inverted and they have all copies of themselves; the Lost Boys are slaves, Hook is a pharaoh-like figure assited by Egyptian-looking versions of the Pirates, and so on.

* ''WesternAnimation/TheAdventuresOfJimmyNeutronBoyGenius'' had an episode where Jimmy's evil clone uses a modified duplication device to make a evil copy of the entire earth except for Jimmy so that he will have an entire world where everyone is as evil as he is. Jimmy has to travel to the evil earth and reverse the duplication process because the duplicator also has the side effect of causing the original to fade away.

* An episode of ''WesternAnimation/TheSecretSaturdays'' has a magic mirror bring The Mondays, their [[EvilCounterpart evil counterparts]] from a MirrorUniverse, into their world. Each of them has their personalities reversed ''and'' some physical difference to tell them apart. In addition, they are supposed to be made of Anti-Matter, which causes reality to go crazy every time one of the characters approached his or her counterpart ([[ArtisticLicensePhysics Actually, if they were made of antimatter they would have exploded like nuclear bombs the moment they entered the positive universe]]... which is [[spoiler: exactly what happens when Argost tries to absorb both Zak Saturday and Zak Monday's powers in the series finale]]).

* ''Webcomic/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 [[http://www.irregularwebcomic.net/comic.php?current=272 killed in single combat]] by the main-universe Haken, so [[IncrediblyLamePun the only dead Nazi was a good Nazi]].

[[folder:Real Life]]
* If Multiple Universes interpretation theory of physics is true, then somewhere should be a Mirror Universe version of our own where everyone who is good here is evil there and viceversa (Eg. The Jesus in the Mirror Universe would be like UsefulNotes/AdolfHitler in our universe and the Hitler of the Mirror Universe would be like a MessianicArchetype, ala [[UsefulNotes/JesusChrist Jesus]] [[JesusWasWayCool Christ]]).[[note]]Although actually finding a mirror universe out of all the other possible universes would be extremely improbable due to the infinite number of other possible universes that only are different from this one in tiny ways or so different that little is recognizable as a mirror counterpart at all since unlike in fiction there isn't actually any rule (at least that we know) that mirror counterparts of this universe are more likely to exist than any other kind of possible universe.[[/note]] If indeed there's an infinite number of alternate universes, then by pure math there should be at least one where it all matched-up to be the mirror version of ours.
* A new hypothesis also suggest that the Big Bang may have created actually two universes, our own in which time runs forward, and another where time runs backwards (from our perspective of course, for them is the other way around). Of course if true this universe is only "mirror" in the sense of time and not (as far as we know) on moral alignment.
[[/folder]]

* There's an arc in the ''Anime/YuGiOh'' fic ''[[https://www.fanfiction.net/s/13501363/25/Chaos-Effect Chaos Effect]]'', set in-between Duelist Kingdom and Battle City, where [[SelfInsert Edwin]], Tristan, Tea, and [[OriginalCharacter Tea's sister Yuri]] are sucked into a morality-flipped universe, where everything has a punk dystopian aesthetic and [[spoiler: Solomon Moto]] rules Domino City with an iron fist. Edwin, being GenreSavvy, takes the time to educate the others on this trope and its variations when helping them adjust to what's happened to them.

* ''VideoGame/FireEmblemEngage'': This is one of the main ideas behind the "Fell Xenologue" [[DownloadableContent DLC]], as it essentially takes place in one where [[TheBadGuyWins Sombron wins]]. The Four Hounds, who are some of the main game's main villains, are the good guys and have opposite personalities to their mainline counterparts. There's also the royals, who also have opposite personalities to their mainline counterparts, like how [[TheEeyore Alcryst]] is egotistical, or how [[TheAtoner Ivy]] is corrupt tyrant. It's mentioned that their retainers, who, although long dead at this point, had the opposite personalities as the main counterparts as well. For example, [[BizarreTasteInFood Chloé]] is said to have had a PlainPalate, [[AnimalLover Merrin]] is said to have hated animals, [[TeamChef Brunet]] is said to have been a LethalChef, etc. However, [[spoiler:It turns out that the royals are actually [[OurZombiesAreDifferent Corrupted]], so whether or not these are accurate depictions of Alternate Elyos' inhabitants while they were still alive is up for debate.]]

* ''WesternAnimation/JusticeLeagueCrisisOnTwoEarths'', strongly inspired by the Crime Syndicate stories above.
** ''WesternAnimation/JusticeLeagueCrisisOnTwoEarths'' depiction of Batman's counterpart Owlman is far more representative of an "evil version" than the Justice Lords Batman. Owlman sums up the entire topic of alternate versions nicely to Superwoman (evil version of Mary Marvel, counterpart to Wonder Woman):
--->'''Owlman:''' Every decision we make is meaningless because somewhere, on a parallel Earth, we have already made the opposite choice. We're nothing. Less than nothing.\\
'''Superwoman:''' How can you say that? We're rich. We're conquerors.\\
'''Owlman:''' ''[pointing at alternate Earths]'' And here we're poor. We're slaves. And here, our parents never met, so we were never born. Here, the world ended in nuclear war. Here, no fish was brave enough to crawl up on land and humans never evolved. And so on, ad infinitum.
** And summed it up even more succinctly to Batman later on:
--->'''Batman:''' YoureInsane.\\
'''Owlman:''' Does it really matter? There are alternate versions of me that you would find quite charming.

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* In ''Webcomic/ShatteredGlassPrime'', in this universe, Optimus Prime is a brutal warmonger who seeks to rule Cybertron under his rule and Megatron is a NiceGuy and leader of the Decepticons who seeks to put an end to Prime's reign.

* One ''WesternAnimation/{{Rugrats}}'' has Chuckie and Tommy thinking that they landed in "Mirror Land" when they flipped over a mirror. HilarityEnsues.

* ''Series/TheUmbrellaAcademy2019'': TheStinger for Season 2 has [[spoiler: the Red Sparrow Academy siblings as the AlternativeTimeline bad counterparts for the Umbrella Academy siblings. The alternative universe Ben in particular is [[{{Jerkass}} mean and rude]] unlike the AllLovingHero and FriendlyGhost Ben of the original timeline who performed a HeroicSacrifice]].
* ''Series/RedDwarf'' introduced an interesting variation in the episode "Backwards". The crew travels to an alternate universe where time runs backwards, which results in Rimmer and Kryten deciding that they wanted to stay since objectively this world is better since death doesn't exist due to people coming back to life before aging backwards and criminals un-commit crimes. They further point out that in this universe Hitler will, in a few decades, be responsible for bringing thousands of people back to life and liberating countries from an oppressive government that he then dismantles, while Lister responds that the story of Santa Claus is about a fat man who steals all the kid's favourite toys.

* One of the many, many sphere malfunctions in ''Series/SevenDays'', rather than sending Parker into a Mirror Universe, 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, everything in this "inverted universe" is mirrored. Get it?

* ''Series/DarkMatter'': An alternate universe is introduced in the second season episode "Stuff to Steal, People to Kill". It's not a straight example of a Mirror Universe because not everyone's moralities are reversed, but the moralities of the ''Raza'' crew (our protagonists) are. In the primary universe they were mindwiped at the beginning of the series and became subject to AmnesiacsAreInnocent, and in the alternate universe this never happened, so they are still a bunch of mass-murdering [[PsychoForHire Psychos for Hire]]. The AU crew join forces with Ferrous Corp and Emperor Ishida as a BigBadEnsemble in Season 3. The ChronicBackstabbingDisorder that crewmembers Two and Three encounter while ImpersonatingTheEvilTwin on the alternate ''Raza'' is an intentional ShoutOut to the attempted coup Kirk, [=McCoy=] and Uhura face in the ''Star Trek'' Mirror Universe. In keeping with the ''Trek'' Mirror universe episodes, the alternate ''Raza'' is also more dimly lit.

* ''Series/TheUmbrellaAcademy'': TheStinger for Season 2 has [[spoiler: the Red Sparrow Academy siblings as the AlternativeTimeline bad counterparts for the Umbrella Academy siblings. The alternative universe Ben in particular is [[{{Jerkass}} mean and rude]] unlike the AllLovingHero and FriendlyGhost Ben of the original timeline who performed a HeroicSacrifice]].

->'''Wendy:''' You're telling me that you -- Pip -- a priest -- are willing to risk your life for me.\\
'''Mirror Pip:''' We're all children of the Lord.\\
'''Wendy:''' I'm in the mirror universe. ... A parallel universe where everyone who's good is evil, and evil is good. It's like that episode of ''Series/{{Star Trek|The Original Series}}'' where Spock had a goatee and Chekov tried to --\\

* Subverted in ''Series/StargateSG1''. 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. Which is pretty much how they solve the problem of sending everyone back.]]

->'''Wendy''': You're telling me that you -- Pip -- a priest -- are willing to risk your life for me.\\
'''Mirror Pip''': We're all children of the Lord.\\
'''Wendy''': I'm in the mirror universe. ... A parallel universe where everyone who's good is evil, and evil is good. It's like that episode of ''Series/{{Star Trek|The Original Series}}'' where Spock had a goatee and Chekov tried to --\\
'''Mirror Pip''': ''Star Trek''. You mean the sci-fi series from the Sixties starring the great Creator/GeorgeTakei?\\
'''Wendy''': It ''is'' an evil universe.

* In the ''Series/DoctorWho'' story "Inferno", 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)[[note]]as the ''Franchise/StarTrek'' example was not yet so dominant, the evil universe versions of both the Brig and Stahlman have less facial hair than the mainstream ones[[/note]]. 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.]]

* ''Series/MysteryScienceTheater3000'' explicitly parodied the ''Star Trek'' mirror universe in their ''Film/LastOfTheWildHorses'' episode. Tom and Gypsy are swapped with their evil counterparts. In the evil universe, Dr. Forrester and TV's Frank are trapped on the SOL, while bearded Mike and the bots subject them to horrible movies. Notice how they even sit on opposite sides of the theater.

* In ''Series/BuffyTheVampireSlayer'', Cordelia [[BeCarefulWhatYouWishFor gets her wish that Buffy never came to Sunnydale]], turning the town (and likely the world) into hell. Xander and Willow are vampires and rule the streets at night, Angel is regularly sexually tortured by Willow, Buffy eventually turns up bitchier than [[Franchise/{{Terminator}} Sarah Connor at her worst]] to stop a vampire plot to rule the world, only to die trying like most of the show's characters.

* ''Series/{{The Suite Life of Zack and Cody}}'': Zack and Cody travel to an alternate universe in the episode "Suite Life of Success" where everything is ideal for them: Mr. Moseby is a fun-loving rule-breaking cool guy; the hotel is called "The Fitzpatrick" because Maddie is the heiress instead of London; London has Maddie's former job as candy counter girl and is the smart one while Maddie is {{The Ditz}}; Carey is a famous singer and lets the boys do everything they want; Esteban is a maid; George Clooney is on the nickle; and Arwin is Carey's manager has hair wears leather and Carey has a massive crush on him instead of vice versa.

* ''Series/TheUmbrellaAcademy'':
** TheStinger for Season 2 has [[spoiler: the Red Sparrow Academy siblings as the AlternativeTimeline bad counterparts for the Umbrella Academy siblings. The alternative universe Ben in particular is [[{{Jerkass}} mean and rude]] unlike the AllLovingHero and FriendlyGhost Ben of the original timeline who performed a HeroicSacrifice]].

* ''WesternAnimation/TheSmurfs2021'': In one episode, Brainy and Smurfblossom find themselves in a parallel universe where the Smurfs are gray and mean, while Gargamel and Azrael are kind.

* {{Downplayed}} in ''Fanfic/TheWrongReflection'', a ''VideoGame/StarTrekOnline'' fanfic dealing with the TropeNamer. The makeup of the prime universe Captain Kanril Eleya's crew means there physically ''can't'' be a straight-played evil version of the USS ''Bajor'': In ''Series/StarTrekDeepSpaceNine'' Bajor is part of the Klingon-Cardassian Alliance in the mirror universe--the Occupation of Bajor was perpetrated by ''humanity'' and they were freed by the Alliance conquest--but most of the members of Eleya's senior staff are Terran species. So instead other things get changed: Mirror Kanril is the XO on a Cardassian battleship and a darker version of the AntiHero compared to the PragmaticHero Eleya.

* ''Franchise/StarTrek'' makes several visits to or in some way involves the Mirror Universe.
** The ''Series/StarTrekTheNextGeneration'' [[Franchise/StarTrekExpandedUniverse novel]] "Dark Mirror" explores a Mirror Universe where the Terran Empire, or the United Empire of Planets as its called here, survives well into the 24th century after Spock's efforts to reform the Empire fail. By the 2360s the Empire is running out of space to conquer and [[spoiler:makes an unsuccessful attempt to conquer the prime universe.]] [[note]]Obviously, the novel was written several years before ''Series/StarTrekDeepSpaceNine'' explains what [[Recap/StarTrekDeepSpaceNineS02E23Crossover really happened]] to the Empire after Kirk left. However since the episode "[[Recap/StarTrekTheNextGenerationS7E10Parallels Parallels]]" established that an infinite number of parellel universes existed this could provide an explanation of why the "Dark Mirror" Mirror Universe was different.[[/note]]
** ''Literature/StarTrekShatnerverse'' novels explain that the Klingon-Cardassian alliance was the brainchild of former Emperor Kirk as a means of taking revenge on Spock for deposing him from the throne and to regain the Terran Empire's throne for himself. This was mainly due to Mirror Spock deciding not to kill Kirk after his return.[[spoiler: Spock did manage to save the Halkans by claiming they were a client state of the Klingons and that attacking them could lead to a war with the Klingons that the Empire didn't want at the time. This resulted in Kirk getting a commendation for seeing through the Halkan trap.]]
** In the ''Literature/StarTrekNovelVerse'' novels set in the Mirror Universe established that Spock was unable to convince Kirk to spare the Halkans and got in a fight with the man. Spock killed Kirk and then disposed of Kirk's body with the Tantalus Field. After Spock's opponents accquired the same habit of disappearing that Kirk's opponents used to have, dissent died down on the ISS ''Enterprise''. Gathering power and influence, Spock rose to command the Empire, which he soon disestablished in favor of the Terran Republic, but the Klingons and Cardassians still wanted revenge for the Empire's acts. Spock died on Earth in the novel verse, but his followers were able to engineer a rebellion that would in time liberate Earth and its allies from the Klingons and Cardassians.

* The ''Star Trek'' Mirror Universe started out (in the ''Series/StarTrekTheOriginalSeries'' that introduced it) as identical to the main universe, except for the moral inversion between the Federation characters and their evil Terran Empire counterparts. When the Mirror Universe was revisited in ''Series/StarTrekDeepSpaceNine'', the correspondences were less straightforward -- the Empire had been overthrown by the Klingon-Cardassian Alliance, humans were downtrodden slaves, and the station was run by [[DepravedBisexual Kira's evil counterpart]].
** And was actually an UnbuiltTrope in its first appearance. Even though his mirror counterpart had a BeardOfEvil, Spock was, as the show put it, "A man of honor in both universes", [[AntiVillain 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 ''[[Series/StarTrekEnterprise Enterprise]]'' revisited it in "In A Mirror Darkly," it also completely [[SpecialEditionTitle changed its opening credits']] entire mood from "Idealistic Yet Not Naive Hope" to "War! Conquest! ''Exploding [[SlowLaser Slow Lasers]]!''" Moreover, since almost everyone except maybe the Vulcans is shown to be evil in one way or another, the ending in which TheBadGuyWins doesn't really come as a surprise. What ''does'' come as something of a twist is [[spoiler: it's the bad ''gal'' who wins, and then promptly proclaims herself Empress.]]
** Certain other aspects of characters are flipped in the mirror universe as well. In ''Series/StarTrekDeepSpaceNine'', Bashir is a [[DumbMuscle stupid and brutish thug]] (most likely due to never having been genetically altered), Odo is a [[TheBully sadistic slave overseer]], Jadzia is a PsychoKnifeNut who is mirror Sisko's lover, mirror Sisko (while a good guy) has very little in the way of restrained self-control, and mirror Ezri and Leeta (while also not villains, though also not squeaky-clean) are both lesbians. ''[[CorruptCorporateExecutive Brunt]]'' of all people becomes a NiceGuy. Things get ridiculous when an [[SerialEscalation entirely fictional holodeck character appears as a real person]], (perhaps his mirror creator makes androids instead of holodeck characters?) whereupon everyone gives up trying to make sense of things.
** The [[Literature/StarTrekMirrorUniverse Star Trek novels]] continue the Mirror Universe after season seven of ''Deep Space Nine'', showing us how the Terran Rebellion is becoming more of a social revolution, as well as giving us perspectives on Mirror Spock's rise to power as Emperor after the initial episode "Mirror, Mirror", Empress Sato's putting down of the rebellion during the ''Enterprise'' era, and how Picard stopped being a slave and became a Terran Rebellion leader during the TNG era. [[spoiler: The MU gets a happy ending: As the mirror ''[[Series/StarTrekDeepSpaceNine [=DS9=]]]'' gang kicked much booty with their version of the Defiant, somebody got their hands on the ''Enterprise''-E's specs. The tide of the war is turned, this time by ''genuinely'' good guys and not an equally-brutal faction that the existing bad guys were keeping down. And now, the rebellion is victorious, and with the war over, they've got this nice shiny awesome spaceship that's no longer needed for battle. The ''Enterprise'' will now be used for exploration under the command of a rebel named Picard.]]
** Also, the ExpandedUniverse ''does'' show us more than one version of the Mirror Universe, though whether it's intentional or simply the Trek EU not being having nearly as tight continuity as the ''Franchise/StarWars'' one is unknown. "Dark Passions" is quite incompatible with the Shatnerverse version, for example. Also, one book written ''well'' after ''[[Series/StarTrekDeepSpaceNine [=DS9=]]]'' features several alternate universes, including one featuring the ISS ''Enterprise''-E of the Terran Empire, which doesn't work with the [=DS9=] incarnation of the MU, so that one is clearly deliberately alternate from the beginning.
** It also explores how long the unique mindset of the Terran Empire has been around. In ''Dark Mirror'', Picard reads that universe's version of ''Theatre/TheMerchantOfVenice'', which has Portia saying "The quality of mercy must be '''''earned'''''", and pointing how it's silly to expect a pound of flesh not to have blood too, allowing Shylock to get his revenge. Picard sees Literature/TheBible and refuses to read it.
*** It should be noted that the show does occasionally show us parallel universes that are not the 'Mirror Universe.' In the ''Series/StarTrekTheNextGeneration'' episode "Parallels", Worf is stuck traveling between different realities in which there are mostly only minor differences. The only semi-villainous alternate main character was a Riker from a timeline in which the Borg had assimilated much of the galaxy, who fired on Worf's shuttle, desperate to avoid returning to his native universe. He does sport a much more wild and unkempt beard than our Riker, but it is clearly a BeardOfSorrow rather than a BeardOfEvil.
*** The episode "Parallels" does show one Mirror Universe from the Bajorans perspective, as in one is them who are the enemies of the Federation (not the Cardassians) and who actually conquest Cardassia and not the other way around.
*** The IDW comic story "Mirrored" gives us the Mirror Universe of the [[Film/StarTrek2009 Kelvin Timeline]] Universe. As Captain Spock vanquishes the Klingons in the name of the Terran Empire, Commander Kirk vists Rura Penthe to get revenge on Nero (who in this universe never escaped, and has been there since the attack on the ''Kelvin''). Then Kirk ends up with control of the ''Narada'', and things get worse.
*** There were several non-canonical sources made between before [=DS9=] that explored the Mirror Universe. As the setting wasn't as well defined as it was later by [=DS9=] some continuity elements may shock some readers. For example the term "Terran" wasn't coined until [=DS9=], thus the works refer to the Empire (which was nameless in the original "Mirror, Mirror" episode) as the United Empire of Planets (for example in the TNG novel ''Dark Universe'', in which the Empire is still pretty much fine in the 24th century) and in some countinuities as the Human-Vulcan Empire with Vulcans, Andorians and Tellarites having more equal footing in the Empire than was shown in ''Enterprise''. However this might explained why Vulcans shared the punishment and were turn into slaves by the Klingon-Cardassian Alliance.
** [[Recap/StarTrekVoyagerS4E21LivingWitness "Living Witness"]] opened with what appeared to be a mirror universe setting, with a vicious Janeway threatening a planet to get resources. [[spoiler: It turned out to be an inaccurate historical record written by this civilization some time in the future, based on an incident with Voyager several hundred years ago. The holographic doctor's backup unit is later activated and sets the record straight.]] Those familiar with Deep Space 9's episodes likely knew it wasn't the case, those who hadn't been watching...
** The video game ''VideoGame/StarTrekOnline'' revisited the Mirror Universe. Unlike other Expanded Universe entries, this Terran Empire went right back to being tyrants after liberating themselves from the Klingon Alliance. Prior to the Season 11 update, the emperor was James O'Brien, son of "Smiley" O'Brien, who attempted to alter the Bajoran Wormhole to initiate a full-scale invasion of the Prime universe. Season 11 changed this so that the empire was now ruled by an unidentified emperor with strange powers, with the main threat on the Prime side being the mirror universe Leeta, who as an admiral fought and won their own Iconian War via weaponry from the future and now seeks to invade our world as a staging ground for a bid to the throne.
** ''[[Series/StarTrekDiscovery Discovery]]'' revisits the Mirror Universe, when the spore drive malfunctions and sends the ship there. The crew manage to get their hands on a rebel database, allowing them to brush up on this world's history. They realize that their only way back is to find the USS ''Defiant'' that ended up there in ENT. We're also shown a glimpse of Captain Sylvia Tilly of that universe, who is as bloodthirsty and vicious as the original Mirror!Kirk. Burnham's double is, apparently, not much better. On the other hand, the double of the morally-ambiguous Lorca is a good guy, who attempted to rise up against the Emperor. [[spoiler:Until we found out Lorca that we know is actually the same mirror universe Lorca, and the entire happenings during the first half of season 1 is orchestrated by him]]
*** We are also introduced to the one biological difference between a Mirror Universe Terran and Prime Universe human: [[spoiler:[[WeakenedByTheLight sensitivity to light]]. This is how Michael recognizes that the Lorca she serves under is actually from the Mirror Universe. And it retroactively explains why Mirror Universe ships had poorer lighting]].
*** We also meet the reigning emperor of the Terran Empire - [[spoiler:Phillipa Georgiou, who is as different from Captain Phillipa Georgiou as day from night. When she ends up in the Prime universe, courtesy of Burnham, the first thing she does is nearly shoot Commander Saru for not immediately bowing down to her, as befits a proper slave (he's an alien, therefore a slave in her universe). She then convinces Starfleet to allow her to destroy Qo'noS, just like she did in the Mirror Universe, in order to force an end to the war]].
*** This arc does explore some implications that are ignored in the other shows. Given that the Mirror counterparts are bloodthirsty and evil, [[ChronicBackstabbingDisorder killing each other any chance they get]], and crossovers have been happening for centuries, it starts to stretch credibility that nearly everyone has a living counterpart as well as a somewhat similar background (Kirk is still captain of the ''Enterprise'', O'Brien is still an engineer at Deep Space Nine, etc). Michael discusses with several individuals the oddity of how similar yet different their background remained, and [[InSpiteOfANail implied some sort of cosmic element keeping the two universes connected]].
*** The third season of ''Discovery'' reveals that the Starfleet of the fourth millennium has figured out how to scan for the specific genetic differences between humans and Terrans in order to catch any "visitors" from the other universe. Furthermore, they claim to have isolated a protein chain that supposedly makes Terrans evil. Georgiou brushes off their claims as overly simplistic. It's also revealed that the two universes have moved apart, and there haven't been any visitors in 500 years.
** Season 2 of ''Series/StarTrekPicard'' introduces a ''different'' Mirror Universe, which is [[spoiler: actually the regular timeline, altered by Q changing the past]]. In this one, the dominant power is the Confederation of Earth rather than the Terran Empire, but it has much the same policies, only it seems to be more efficient because it's a more Lawful and less Chaotic evil. Picard is a ruthless general who collects the skulls of his enemies, Rios is a colonel fighting against the Vulcans, Seven is the President, with Agnes as her chief scientist and Raffi as her head of security, and Elnor is a Romulan freedom fighter. If anything, this is more chilling than the regular Mirror Universe, because while it's usually presented as [[NeverWasThisUniverse having always been like that]], this universe is specifically the result of something that happened as recently as [[NextSundayAD 2024]]. The Confederation of Earth is in many ways similar to the MirrorUniverse's Terran Empire. Both are xenophobic to the extreme, but the Empire focuses on enslavement, while the Confederation prefers to exterminate aliens. There also seems to be a lot less backstabbing in the Confederation, with loyalty to humanity being paramount. An interesting difference is that the Confederation Star Corps seems to use army ranks instead of navy ranks, so we have General Picard and Colonel Rios. This version of Picard is a ruthless conqueror, slayer of many aliens, including General Martok, Gul Dukat, and Sarek. Also, while the Empire was always on the verge of rebellion from the aliens, the Confederation seems to be a lot more successful in stamping out dissent and is even more successful militarily, having managed to defeat the Borg.
** ''WesternAnimation/StarTrekLowerDecks'' shows Mariner going into a holo-deck simulation of the MirrorUniverse which she calls it by that name. The simulation however shows the Terran Empire which by that time was already defeated.

* In ''VideoGame/StarTrekOnline'', your character doesn't get an Evil Counterpart via MirrorUniverse, but the ''ships'' do. And these ships are also playable via lockbox drops.

* ''WebVideo/StarTrekContinues'': The episode "Fairest of Them All" is a direct continuation of the TOS episode "Mirror, Mirror" which deals with the immediate aftermath of the episode. [[spoiler: Unable to prevent Kirk from destroying the Halkan homeworld, Spock leads a mutiny against Kirk and most of the crew takes Spock's side after Kirk says what he really thinks of the ''Enterprise'' crew in a room where Spock had [[EngineeredPublicConfession turned on the intercom]]. Spock gives Kirk and his few loyalists a shuttlecraft so they can reach the nearest habitable world.]]