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[[quoteright:250:[[VideoGame/{{Warcraft}} http://static.tvtropes.org/pmwiki/pub/images/arthasx2b250_1777.jpg]]]]
[[caption-width-right:250:[[{{Pun}} From a]] [[NiceGuy nice]] [[WisePrince prince]] to an [[AnIcePerson ice]] [[EvilIsDeathlyCold prince]].]]
->''The superheroes have turned evil! Most uncool.''
-->-- '''Ethan "Bubblegum" Tate''', ''WesternAnimation/{{Futurama}}''

A good guy turns bad, the opposite of the HeelFaceTurn. The ways in which this happens are many:

* They have become a RivalTurnedEvil.
* They have lost perspective, becoming a WellIntentionedExtremist or KnightTemplar.
* Something horrible has happened that [[DespairEventHorizon shattered their faith in good]], and they have become a FallenHero.
* [[AmbitionIsEvil Lust for power and fortune at any cost]] has brought out their worst.
* [[LoveMakesYouEvil Love has turned into a dangerously out-of-control obsession]].
* NoGoodDeedGoesUnpunished: Too many of their good deeds having come back to bite them convinces them [[BeingGoodSucks being a hero is no longer worth it]].
* Their allies have [[HangingSeparately made life too difficult]] or out-and-out [[EtTuBrute betrayed them]].
* They've [[BewareTheNiceOnes snapped]] after one too many rounds of [[BreakTheCutie being put through hell]].
* Fighting evil for too long has led to their [[HeWhoFightsMonsters becoming what they once opposed]].
* They have gone DrunkWithPower.
* They fell prey to TheCorrupter[=/=]TheCorruption, which brought out the worst in them.

This is the EvilCounterpart to the more common HeelFaceTurn and is generally found in a story with BlackAndWhiteMorality. The many reasons and the probability for a turn are listed in the SortingAlgorithmOfFaceHeelTurning.

In a world full of {{Brainwashed}} victims, they may be the one who appears to be but really is NotBrainwashed.

The term "Face Heel Turn" comes from ProfessionalWrestling, in which a "good" wrestler (a {{face}}) is occasionally tempted by TheDarkSide, or just gets fed up, and becomes a {{heel}}. Magazines and other promotional material from the various wrestling "leagues" frequently comment on various wrestlers' changes in "alignment" (in wrestling's fictional plotline known as {{kayfabe}}) nearly as frequently as they actually cover events in the ring themselves. (They even use phrases like "Face Heel Turn", though the shorter "Heel Turn" is more common.)

A wrestler's heel turn is often a sign that he or she is about to see his or her popularity skyrocket. Indeed, it is very common, once they have turned, to remain heels for their entire careers. Heels that become ''really'' popular may end up "naturally" becoming faces again, but it is just as likely for heels to be beloved ''because'' [[LoveToHate they are heels]]. In fact, as paradoxical as it might seem, a heel turn can help an otherwise despised wrestler become likable: fans may well resent a MarySue face character, and may be better able to relate to a character who is [[ThisLoserIsYou profoundly flawed in one way or another]]. (After all, that's what satire is all about.)

Contrast:
* TheMole: The Mole was always working for the BigBad from the beginning, whereas a character making a Face Heel Turn was a genuine good guy until their change of heart.
* ForcedIntoEvil, whereas the character was still a genuinely good guy, but had his own reasons to be on the bad guys' side while still maintaining a good heart, whereas a character who did a Face Heel Turn is a character who not only goes to the bad guys' side, but also become a genuine bad guy at heart. A character Forced Into Evil can be said about halfway doing a full Heel Turn, but not a full turn yet like the ones in this page (given time, they may make a full turn in the future).
* FaceMonsterTurn, which has ''many'' subtropes. The character really has no choice about becoming evil, because they are Brainwashed, [[AndThenJohnWasAZombie literally turned into monsters]], [[DemonicPossession are possessed]], or some other reason.

Compare ProtagonistJourneyToVillain, a plot which utilizes this trope as the entire character and story arc.

See also HeelFaceRevolvingDoor, NeutralNoLonger, DealWithTheDevil, WeUsedToBeFriends, StartOfDarkness and EtTuBrute.

Not to be confused with EvilAllAlong, in which a character that was thought to be good was, well, [[CaptainObvious evil all along]]. This trope describes a legitimate hero going to the darkside, not a DoubleAgent.

'''SPOILERS AHOY'''

In real-life the nature of HeelFaceTurn and FaceHeelTurn is subjective (one person's "[[HeelFaceTurn seeing the light]]" is another person's "[[FaceHeelTurn heartless betrayal]]" depending on what group the individual is going to or leaving) Administrivia/NoRealLifeExamplesPlease.

[[noreallife]]
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!Example subpages

[[index]]
* FaceHeelTurn/AnimeAndManga
* FaceHeelTurn/ComicBooks
* FaceHeelTurn/FanWorks
* FaceHeelTurn/{{Film}}
* FaceHeelTurn/{{Literature}}
* FaceHeelTurn/LiveActionTV
* FaceHeelTurn/{{Music}}
* FaceHeelTurn/ProfessionalWrestling
* FaceHeelTurn/ReligionAndMythology
* FaceHeelTurn/TabletopGames
* FaceHeelTurn/VideoGames
* FaceHeelTurn/WebComics
* FaceHeelTurn/WebOriginal
* FaceHeelTurn/WesternAnimation
[[/index]]

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[[foldercontrol]]

[[folder:Theater]]
* Arguably Elphaba from ''Theatre/{{Wicked}}'' fits this trope, after having everything she tries spectacularly backfire on her, and having everyone she loves die all around her, she snaps during the song 'No Good Deed' dedicating herself to a lifetime of evil. Almost immediately subverted when she is shown to be just very, very pissed off, but not actually evil a mere song later.
* In the back story of {{Euripides}}' ''Hecuba'', Achilles, hero of ''Literature/TheIliad'', defected to Troy after falling in love with Trojan princess Polyxena. And then his would-be brother-in-law Paris shot him in his AchillesHeel ''at the wedding'', and everything went pear-shaped for the Trojans.
[[/folder]]

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