The Evil Doppelgänger is traditionally a MirrorUniverse counterpart. The double can also be the equivalent of ForWantOfANail: he/they represents what the hero or heroes could become, or may become.

Sometimes the evil double is a clone and may brood about how he's not a "real" person, just a hollow imitation of the original. If that happens, the clone tends to go mad and try to murder the original to take his place.

The evil doppelgänger is not to be confused with the original doppelgänger. This character is more like the EvilTwin. See also CriminalDoppelganger and EvilCounterpart.
!!Types of evil doppelgangers include:

!!Anime & Manga
* The Copy Rockman/Copy Robot from ''MegaManMegamix'' is a good example. He's a copy of Mega Man that believes himself to be the real one and has his memories, but then he goes and tries to kill Dr. Wily. This helps to prove that he's not the original, due to the whole ThouShallNotKill thing. He's more powerful than the original, but has a defect that can overload and destroy him, guess what happens in the end. When Copy Rockman finds out he's a copy created by Wily, [[spoiler:in the end he commits a HeroicSacrifice to save everyone from Bass and his own destruction]].
* ''Anime/SonicTheHedgehogTheMovie'' had Metal Sonic act like this, that is until [[spoiler:his final moments]].
* ''Manga/MagicKnightRayearth'' had Nova, who apart from PointyEars (and a SlasherSmile...) looks a lot like Hikaru. [[spoiler:She's actually the personification of Hikaru's guilt and despair.]]
* Mewtwo from ''Anime/PokemonTheFirstMovie'' franchise may count. He does eventually do a HeelFaceTurn of sorts.

!!Comic Books
* ''Franchise/{{Superman}}''
** SelfDemonstrating/{{Bizarro}} is an imperfect clone of Superman, but Bizarro may be considered as more of a victim himself as he's lacking in the intelligence department.
** Superman's actually ''evil'' counterpart is his MirrorUniverse double, Ultraman [[Series/{{Ultraman}} (no relation)]].
* One of these is featured in the PhineasAndFerb fic [[ PnF: Stolen Identity]] though [[WhatHappenedToTheMouse the origins of said doppelganger are never properly explained]].
* ''Franchise/StarWars'' has Emperor Palpatine as the EvilCounterpart to Master Yoda.
* ''Franchise/{{Godzilla}}'' has two: [[Film/GodzillaVsMechagodzilla Mecha Godzilla]] and [[Film/GodzillaVsMechagodzilla Space Godzilla]].
* In ''WesternAnimation/ToyStory3'', Woody meets his not-so-nice Doppelgänger in [[spoiler:Lots-o'-Huggin' Bear]].

!!Live Action TV
* ''Franchise/StarTrek'', of course, has the MirrorUniverse, with evil beards and everything.
!!Video Games
* In ''VideoGame/SaintsRowIV'' you have to face your character's evil doppelganger, who has an evil eyepatch and a goatee (even if your character is female).

!!Web Comics
* In ''Webcomic/TheInexplicableAdventuresOfBob,'' Galatea is an emotionally unstable, sometimes dangerous clone of Molly, but it would be unfair to call her ''evil.'' [[ChaoticNeutral "Chaotic"]] though? [[WildCard Sure.]]