History FaceHeelTurn / VideoGames

* ''VideoGame/InjusticeGodsAmongUs'' has Superman doing this after the Joker blows Metropolis to kingdom come with a bomb he attached to Lois, detonating it by drugging Superman into thinking Lois was Doomsday. When Lois's heart stopped, boom. Superman, in a fit of rage, tears the Joker's heart out, ignoring Batman's attempts to stop him. Afterwards, the good-hearted boyscout superhero was no more, and he became a cold-hearted, paranoid tyrant that is seemingly unstoppable [[spoiler:except against another Superman from another universe who hadn't experienced such trauma and still stayed on the side of good.]]

* ''Franchise/Mortal Kombat'':

* ''[[Franchise/Mortal Kombat]]'':

*** Raiden is another person like this, as he was once good, but when Onaga appeared, he caused an explosion that would kill him, [[SenselessSacrifice but it did not]], [[CameBackWrong turning him into Dark Raiden as Onaga's essence corrupted him]]. Dark Raiden would then go on to punish people who would threaten Earthrealm.

* Mortal Kombat:

*** Raiden is another person like this, as he was once good, but when Onaga appeared, he caused an explosion that would kill him, [[SenselesSacrifice it did not]], [[CameBackWrong turning him into Dark Raiden as Onaga's essence corrupted him]]. Dark Raiden would then go on to punish people who would threaten Earthrealm.
** ''VideoGame/MortalKombatX'' sees several good characters go heel. [[spoiler:Kung Lao, Kitana, Smoke, Kabal, Stryker, Nightwolf, and Liu Kang end up staying as revenants, when Scorpion's vengeance on Quan Chi results in a HeelFaceDoorSlam. Raiden himself goes rogue, after his HeroicSacrifice at the end of ''MKX''.]]

* ''VideoGame/MortalKombatDeception'' sees Kabal actually ''reverting'' to his bad guy ways and ''running'' with it. After being rescued from death by the Chaos cleric Havik, Kabal is convinced to resurrect the criminal Black Dragon clan. He then finds Mavado (the Red Dragon thug who put him at Death's door), pays him back double, steals back his hookswords (which "feels good" for him to hold again) and then hires young, methodical killers to transform the Black Dragon from a band of pirates into a nihilistic organization determined to overthrow civilization. And Heaven help you if you don't fit Kabal's criteria of what a Black Dragon should be.

* [[spoiler:Judith Mossman ]] from ''VideoGame/HalfLife2''. She [[spoiler: Does it so much you'll have whiplash by the final level.]]
* ''Franchise/{{Halo}}''
** Your buddy friend, 343 Guilty Spark does this on two occasions. In ''VideoGame/HaloCombatEvolved'', he helps you to activate the ring until Cortana stops you two, pointing that doing so will kill everyone. 343 Guilty Spark sees this as breaking protocol and then tries to kill you. This also happens in ''VideoGame/Halo3'', where you find out that firing the unfinished Halo will also destroy it. 343 starts going off at you again and then kills Sergeant Johnson. [[spoiler: You quickly kill 343 Guilty Spark with Johnson's Spartan laser.]]
** [[spoiler: Cortana]] of all people becomes the BigBad in ''VideoGame/Halo5Guardians''. [[spoiler: She goes from heroically sacrificing herself to save Master Chief in ''VideoGame/Halo4'', despite her rapidly deteriorating sanity, to attempting to rule over the galaxy as a benevolent overlord in ''Halo 5'' after she's revived and discovers a way to make [=AIs=] immortal.]]
* In ''Hero Senki'' [[spoiler: Gilliam Yeager, the Ally with the most powerful unit at the start of the game is the final boss. He becomes TheAtoner after he jumps universes though]]

* The player character and his FiveManBand in ''Mechwarrior 4: Vengeance'' becomes the main villainous group in the ''Black Knight'' expansion.

** There's also [[spoiler:Kazuya's son with Jun]], Jin Kazama. He was TheHero for about three games, then at the beginning of the sixth game, takes over the MegaCorp and uses it to start WorldWarIII and try to TakeOverTheWorld, which prompts Kazuya to speed up his plan for world domination.