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** In ''[[VideoGame/MarioAndLuigiBowsersInsideStory Mario & Luigi: Bowser's Inside Story]]'', he does this completely ''unknowingly''. He doesn't know that [[FantasticVoyagePlot the bros are in his gut]]. All he knows is that Fawful has ''his'' castle, and is trying to kidnap ''his'' princess and take over ''his'' Mushroom Kingdom. Mario and Luigi do their part behind the scenes, even during the {{Final B|oss}}attle.
to:
** In ''[[VideoGame/MarioAndLuigiBowsersInsideStory Mario & Luigi: Bowser's Inside Story]]'', he does this completely ''unknowingly''. He doesn't know that [[FantasticVoyagePlot the bros Bros are in his gut]]. All he knows is that Fawful has ''his'' castle, and is trying to kidnap ''his'' princess and take over ''his'' Mushroom Kingdom. Mario and Luigi do their part behind the scenes, even during the {{Final B|oss}}attle.B|oss}}attle.
** In contrast with how he deals with new villains in other Mario role-playing games, ''VideoGame/MarioAndLuigiDreamTeam'' has Bowser knowingly (as in, no brainwashing or accidental assistance) team up with the BigBad ''against'' Mario, even though Antasma has commandeered his role as the Peach-kidnapper.
** In contrast with how he deals with new villains in other Mario role-playing games, ''VideoGame/MarioAndLuigiDreamTeam'' has Bowser knowingly (as in, no brainwashing or accidental assistance) team up with the BigBad ''against'' Mario, even though Antasma has commandeered his role as the Peach-kidnapper.
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* In ''{{Warhammer 40000}}: Rites of War'', you, playing as the Eldar, spend the first half of the campaign fighting your way through Imperial forces, including PDF and Guard forces, Sisters of Battle, and Space Marines. Just when you finally break the back of Imperial resistance on the planet, you find out that the [[HordeOfAlienLocusts Tyranids]] are attacking, and that there is a Tyranid [[ApocalypseHow hive fleet]] approaching. All of a sudden, you are teaming up with TheRemnant of Imperial forces to fight the Tyranids, meaning you can recruit Guard, Sororitas, and Space Marine units into your army. Unfortunately for the Eldar, they're still going to have to bear the brunt of the fighting, even though, in the fluff, the [[ManipulativeBastard Eldar]] would prefer to have the humans do the heavy lifting.
to:
* In ''{{Warhammer 40000}}: Rites of War'', you, playing as the Eldar, spend the first half of the campaign fighting your way through Imperial forces, including PDF and Guard forces, Sisters of Battle, and Space Marines. Just when you finally break the back of Imperial resistance on the planet, you find out that the [[HordeOfAlienLocusts Tyranids]] are attacking, and that there is a Tyranid [[ApocalypseHow hive fleet]] approaching. All of a sudden, you are teaming up with TheRemnant of Imperial forces to fight the Tyranids, meaning you can recruit Guard, Sororitas, and Space Marine units into your army. Unfortunately for the Eldar, they're still going to have to bear the brunt of the fighting, even though, in the fluff, the [[ManipulativeBastard Eldar]] would prefer to have the humans do the heavy lifting.lifting.
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** In ''[[VideoGame/MarioAndLuigiBowsersInsideStory Mario & Luigi: Bowser's Inside Story]]'', he does this completely ''unknowingly''. He doesn't know that [[FantasticVoyagePlot the bros are in his gut]]. All he knows is that Fawful has ''his'' castle, and is trying to kidnap ''his'' princess and take over ''his'' Mushroom Kingdom. Mario and Luigi do their part behind the scenes, even during the {{Final B|oss}}attle.
to:
** In ''[[VideoGame/MarioAndLuigiBowsersInsideStory Mario & Luigi: Bowser's Inside Story]]'', he does this completely ''unknowingly''. He doesn't know that [[FantasticVoyagePlot the bros Bros are in his gut]]. All he knows is that Fawful has ''his'' castle, and is trying to kidnap ''his'' princess and take over ''his'' Mushroom Kingdom. Mario and Luigi do their part behind the scenes, even during the {{Final B|oss}}attle.B|oss}}attle.
** In contrast with how he deals with new villains in other Mario role-playing games, ''VideoGame/MarioAndLuigiDreamTeam'' has Bowser knowingly (as in, no brainwashing or accidental assistance) team up with the BigBad ''against'' Mario, even though Antasma has commandeered his role as the Peach-kidnapper.
** In contrast with how he deals with new villains in other Mario role-playing games, ''VideoGame/MarioAndLuigiDreamTeam'' has Bowser knowingly (as in, no brainwashing or accidental assistance) team up with the BigBad ''against'' Mario, even though Antasma has commandeered his role as the Peach-kidnapper.
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* In ''{{Warhammer 40000}}: Rites of War'', you, playing as the Eldar, spend the first half of the campaign fighting your way through Imperial forces, including PDF and Guard forces, Sisters of Battle, and Space Marines. Just when you finally break the back of Imperial resistance on the planet, you find out that the [[HordeOfAlienLocusts Tyranids]] are attacking, and that there is a Tyranid [[ApocalypseHow hive fleet]] approaching. All of a sudden, you are teaming up with TheRemnant of Imperial forces to fight the Tyranids, meaning you can recruit Guard, Sororitas, and Space Marine units into your army. Unfortunately for the Eldar, they're still going to have to bear the brunt of the fighting, even though, in the fluff, the [[ManipulativeBastard Eldar]] would prefer to have the humans do the heavy lifting.
to:
* In ''{{Warhammer 40000}}: Rites of War'', you, playing as the Eldar, spend the first half of the campaign fighting your way through Imperial forces, including PDF and Guard forces, Sisters of Battle, and Space Marines. Just when you finally break the back of Imperial resistance on the planet, you find out that the [[HordeOfAlienLocusts Tyranids]] are attacking, and that there is a Tyranid [[ApocalypseHow hive fleet]] approaching. All of a sudden, you are teaming up with TheRemnant of Imperial forces to fight the Tyranids, meaning you can recruit Guard, Sororitas, and Space Marine units into your army. Unfortunately for the Eldar, they're still going to have to bear the brunt of the fighting, even though, in the fluff, the [[ManipulativeBastard Eldar]] would prefer to have the humans do the heavy lifting.lifting.
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** In ''[[VideoGame/MarioAndLuigiBowsersInsideStory Mario & Luigi: Bowser's Inside Story]]'', he does this completely ''unknowingly''. He doesn't know that the bros are in his gut. All he knows is that Fawful has ''his'' castle, and is trying to kidnap ''his'' princess and take over ''his'' Mushroom Kingdom. Mario and Luigi do their part behind the scenes, even during the {{Final B|oss}}attle.
to:
** In ''[[VideoGame/MarioAndLuigiBowsersInsideStory Mario & Luigi: Bowser's Inside Story]]'', he does this completely ''unknowingly''. He doesn't know that [[FantasticVoyagePlot the bros are in his gut.gut]]. All he knows is that Fawful has ''his'' castle, and is trying to kidnap ''his'' princess and take over ''his'' Mushroom Kingdom. Mario and Luigi do their part behind the scenes, even during the {{Final B|oss}}attle.
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* ''VideoGame/MassEffect2'' has Commander Shepard brought back to life by [[WellIntentionedExtremist The Illusive Man]], who may have been responsible for killing his/her squad in the Sole Survivor backstory, in order to combat the HumongousMecha {{Eldritch Abomination}}s out to wipe out humanity (and all galactic civilization, but Mr. Illusive doesn't really care about them), even willing to recruit notably {{Badass}} aliens. Particularly relevant if Shepard is played as Paragon, who does not hesitate to tell TIM that he/she's barely tolerant of his organization only because [[TheCassandra no one else will help him/her]] and in the end [[spoiler:can deny him the Collector Base and technology to "secure human dominance"]].
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* ''VideoGame/MassEffect2'' has Commander Shepard brought back to life by [[WellIntentionedExtremist The Illusive Man]], who may have been responsible for killing his/her squad in the Sole Survivor backstory, in order to combat the HumongousMecha {{mechanical|Lifeforms}} {{Eldritch Abomination}}s out to wipe out destroy humanity (and all galactic civilization, but Mr. Illusive doesn't really care about them), even willing to recruit notably {{Badass}} aliens. Particularly relevant if Shepard is played as Paragon, who does not hesitate to tell TIM that he/she's barely tolerant of his organization only because [[TheCassandra no one else will help him/her]] and in the end [[spoiler:can deny him the Collector Base and technology to "secure human dominance"]].
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\"isn\'t exactly an example of this trope\". Nuff said.
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** Speaking of Bungie, while it isn't exactly an example of this trope, you do join forces with the Pfhor in ''VideoGame/{{Marathon}}'', and you do so because if you do, [[BigBad Tycho]] will decide to keep T'fear from killing all of the humans. It doesn't really matter, since you just go to an alternate reality after he tries to kill you for trying to escape slavery.
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*** The batarians are especially interesting, because if you played the "Bring Down the Sky" DLC for the first game and let the BigBad escape, Balak returns in ''3'' and, due to a severe case of YouAreInCommandNow[[labelnote:more]]The Batarian Hegemony was directly on top of the Reapers' point of arrival into the galaxy, and their higher-ups were already indoctrinated due to contact with a dead Reaper they'd found.[[/labelnote]], is now the highest-ranking batarian naval officer left alive. You can kill him, or, despite him having ''a gun to the back of your head'', browbeat him into adding his forces to the war effort. Afterwards a C-Sec officer asks if Shep wants to have him arrested.
----> '''Shepard:''' I ''want'' you to put a bullet in his head. But we're all making sacrifices today.
----> '''Shepard:''' I ''want'' you to put a bullet in his head. But we're all making sacrifices today.
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* ''VideoGame/MassEffect2'' has Commander Shepard brought back to life by [[WellIntentionedExtremist The Illusive Man]], who may have been responsible for killing his/her squad in the Sole Survivor backstory, in order to combat the HumongousMecha EldritchAbominations out to wipe out humanity (and all galactic civilization, but Mr. Illusive doesn't really care about them), even willing to recruit notably {{Badass}} aliens. Particularly relevant if Shepard is played as Paragon, who does not hesitate to tell TIM that he/she's barely tolerant of his organization only because [[TheCassandra no one else will help him/her]] and in the end [[spoiler:can deny him the Collector Base and technology to "secure human dominance"]].
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* ''VideoGame/MassEffect2'' has Commander Shepard brought back to life by [[WellIntentionedExtremist The Illusive Man]], who may have been responsible for killing his/her squad in the Sole Survivor backstory, in order to combat the HumongousMecha EldritchAbominations {{Eldritch Abomination}}s out to wipe out humanity (and all galactic civilization, but Mr. Illusive doesn't really care about them), even willing to recruit notably {{Badass}} aliens. Particularly relevant if Shepard is played as Paragon, who does not hesitate to tell TIM that he/she's barely tolerant of his organization only because [[TheCassandra no one else will help him/her]] and in the end [[spoiler:can deny him the Collector Base and technology to "secure human dominance"]].
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-->'''Papierwaite:''' I ''hate'' that guy!
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-->'''Papierwaite:''' I ''hate'' that guy!guy!
* In ''{{Warhammer 40000}}: Rites of War'', you, playing as the Eldar, spend the first half of the campaign fighting your way through Imperial forces, including PDF and Guard forces, Sisters of Battle, and Space Marines. Just when you finally break the back of Imperial resistance on the planet, you find out that the [[HordeOfAlienLocusts Tyranids]] are attacking, and that there is a Tyranid [[ApocalypseHow hive fleet]] approaching. All of a sudden, you are teaming up with TheRemnant of Imperial forces to fight the Tyranids, meaning you can recruit Guard, Sororitas, and Space Marine units into your army. Unfortunately for the Eldar, they're still going to have to bear the brunt of the fighting, even though, in the fluff, the [[ManipulativeBastard Eldar]] would prefer to have the humans do the heavy lifting.
* In ''{{Warhammer 40000}}: Rites of War'', you, playing as the Eldar, spend the first half of the campaign fighting your way through Imperial forces, including PDF and Guard forces, Sisters of Battle, and Space Marines. Just when you finally break the back of Imperial resistance on the planet, you find out that the [[HordeOfAlienLocusts Tyranids]] are attacking, and that there is a Tyranid [[ApocalypseHow hive fleet]] approaching. All of a sudden, you are teaming up with TheRemnant of Imperial forces to fight the Tyranids, meaning you can recruit Guard, Sororitas, and Space Marine units into your army. Unfortunately for the Eldar, they're still going to have to bear the brunt of the fighting, even though, in the fluff, the [[ManipulativeBastard Eldar]] would prefer to have the humans do the heavy lifting.
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** Similarly, if you choose to side with the mages in the final confrontation and coerce Fenris/Aveline into joining you, or vice versa with the Templars and Merrill/Anders. The first three are possible with Friendship or Rivalry, but it specifically takes a maxed-out rivalry meter for Anders to swap sides.
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** Similarly, if [[spoiler:if you choose to side with the mages in the final confrontation and coerce Fenris/Aveline into joining you, or vice versa with the Templars and Merrill/Anders. The first three are possible with Friendship or Rivalry, but it specifically takes a maxed-out rivalry meter for Anders to swap sides. ]]
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* In episode 303 of ''[[VideoGame/SamAndMaxFreeLancePolice]]'', Sam is trying to sneak in and retrieve Max's brain from a room where General Skun-Ka'pe and Monsieur Papierwaite are busy firing guns and slinging spells at each other. Unfortunately, Max notices him...
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* In episode 303 of ''[[VideoGame/SamAndMaxFreeLancePolice]]'', ''VideoGame/SamAndMaxFreelancePolice'', Sam is trying to sneak in and retrieve Max's brain from a room where General Skun-Ka'pe and Monsieur Papierwaite are busy firing guns and slinging spells at each other. Unfortunately, Max notices him...
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* ''VideoGame/HalfLife'' - HECU and Black Ops are both there to kill Freeman and fight against each other.
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* ''VideoGame/HalfLife'' - HECU and Black Ops are both there to kill Freeman and fight against each other.other.
* In episode 303 of ''[[VideoGame/SamAndMaxFreeLancePolice]]'', Sam is trying to sneak in and retrieve Max's brain from a room where General Skun-Ka'pe and Monsieur Papierwaite are busy firing guns and slinging spells at each other. Unfortunately, Max notices him...
-->'''Max:''' Sam! Get me outta here! This whole place smells like gorilla and patchouli!
-->'''Skun-Ka'pe:''' ''(turns, slowly)'' Sam? The interloper who foiled my scheme to collect the toys of power and re-imprisoned me in the Penal Zone?!
-->'''Papierwaite:''' ''(turns, slowly)'' Sam? The great-grandson of the poltroon who put the kibosh on my intricate plan to unleash Yog-Soggoth and take over the world?!
-->'''Skun-Ka'pe:''' I hate that guy.
-->'''Papierwaite:''' I ''hate'' that guy!
* In episode 303 of ''[[VideoGame/SamAndMaxFreeLancePolice]]'', Sam is trying to sneak in and retrieve Max's brain from a room where General Skun-Ka'pe and Monsieur Papierwaite are busy firing guns and slinging spells at each other. Unfortunately, Max notices him...
-->'''Max:''' Sam! Get me outta here! This whole place smells like gorilla and patchouli!
-->'''Skun-Ka'pe:''' ''(turns, slowly)'' Sam? The interloper who foiled my scheme to collect the toys of power and re-imprisoned me in the Penal Zone?!
-->'''Papierwaite:''' ''(turns, slowly)'' Sam? The great-grandson of the poltroon who put the kibosh on my intricate plan to unleash Yog-Soggoth and take over the world?!
-->'''Skun-Ka'pe:''' I hate that guy.
-->'''Papierwaite:''' I ''hate'' that guy!
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* If ''Kid Dracula'' and ''VideoGame/{{Castlevania}} Judgment'' are any indication, Galamoth's presence is all it takes for Dracula and his minions to become {{Anti Hero}}es.
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* If ''Kid Dracula'' ''VideoGame/KidDracula'' and ''VideoGame/{{Castlevania}} Judgment'' ''VideoGame/CastlevaniaJudgment'' are any indication, Galamoth's presence is all it takes for Dracula and his minions to become {{Anti Hero}}es.
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* In the indie FPS ''Bet On Soldier'', you spend most of the game fighting through the Bet On Soldier tournament in order to confront the [=BOS=] [[WorldsStrongestMan World Champion]], Igor Boryenka, who you believe to be responsible for the murder of your wife. Once you finally defeat Boryenka, the real BigBad punishes you both by forcing the two of you to fight together in an Arena deathmatch against wave after wave of the best fighters in the [=BOS=] League. It's actually a pretty cool level, since Boryenka retains his boss-like health and damage output, but the sheer number and skill of opponents the two of you face make it seemingly impossible for him to survive to the end.
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* In the indie FPS ''Bet On Soldier'', ''BetOnSoldier'', you spend most of the game fighting through the Bet On Soldier tournament in order to confront the [=BOS=] [[WorldsStrongestMan World Champion]], Igor Boryenka, who you believe to be responsible for the murder of your wife. Once you finally defeat Boryenka, the real BigBad punishes you both by forcing the two of you to fight together in an Arena deathmatch against wave after wave of the best fighters in the [=BOS=] League. It's actually a pretty cool level, since Boryenka retains his boss-like health and damage output, but the sheer number and skill of opponents the two of you face make it seemingly impossible for him to survive to the end.
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* ''VideoGame/HalfLife'' - HECU and Black Ops are both there to kill Freeman and fight against each other.
* In ''BaldursGateDarkAlliance'' ''II'', Jherek the Harper and Kharne the Zhentarim mercenary, spend most of the game fighting for control of the Onyx Tower, then team up up in the final chapter when it becomes apparent that a third party, a vampire warlord named Mordoc Selanmere, has been playing them both so that he can claim the tower for himself.
* In ''BaldursGateDarkAlliance'' ''II'', Jherek the Harper and Kharne the Zhentarim mercenary, spend most of the game fighting for control of the Onyx Tower, then team up up in the final chapter when it becomes apparent that a third party, a vampire warlord named Mordoc Selanmere, has been playing them both so that he can claim the tower for himself.
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* ''VideoGame/HalfLife'' - HECU and Black Ops are both there to kill Freeman and fight against each other.
* In ''BaldursGateDarkAlliance'' ''II'', Jherek the Harper and Kharne the Zhentarim mercenary, spend most of the game fighting for control of the Onyx Tower, then team up up in the final chapter when it becomes apparent that a third party, a vampire warlord named Mordoc Selanmere, has been playing them both so that he can claim the tower for himself.other.
* In ''BaldursGateDarkAlliance'' ''II'', Jherek the Harper and Kharne the Zhentarim mercenary, spend most of the game fighting for control of the Onyx Tower, then team up up in the final chapter when it becomes apparent that a third party, a vampire warlord named Mordoc Selanmere, has been playing them both so that he can claim the tower for himself.
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* ''VideoGame/HalfLife'' - HECU and Black Ops are both there to kill Freeman and fight against each other.
to:
* ''VideoGame/HalfLife'' - HECU and Black Ops are both there to kill Freeman and fight against each other.other.
* In ''BaldursGateDarkAlliance'' ''II'', Jherek the Harper and Kharne the Zhentarim mercenary, spend most of the game fighting for control of the Onyx Tower, then team up up in the final chapter when it becomes apparent that a third party, a vampire warlord named Mordoc Selanmere, has been playing them both so that he can claim the tower for himself.
* In ''BaldursGateDarkAlliance'' ''II'', Jherek the Harper and Kharne the Zhentarim mercenary, spend most of the game fighting for control of the Onyx Tower, then team up up in the final chapter when it becomes apparent that a third party, a vampire warlord named Mordoc Selanmere, has been playing them both so that he can claim the tower for himself.
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* In ''VideoGame/DragonAge'', [[spoiler: after punching some sense into Loghain's thick skull and overthrowing him from the throne, you can choose to spare him from execution and instead conscript him to the Wardens as a chance of redemption. He will then join your party and help you fight the Blight at the cost of Alistair, who will be so outraged with the decision of pardoning Loghain that he will leave.]]
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* In ''VideoGame/DragonAge'', ''VideoGame/DragonAgeOrigins'', [[spoiler: after punching some sense into Loghain's thick skull and overthrowing him from the throne, you can choose to spare him from execution and instead conscript him to the Wardens as a chance of redemption. He will then join your party and help you fight the Blight at the cost of Alistair, who will be so outraged with the decision of pardoning Loghain that he will leave.]]
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* [[VideoGame/TeamFortress2 RED and BLU]] are joining forces against a robotic gray team in the [[http://www.teamfortress.com/mvm/ Mann vs. Machine]] update.
* The penultimate mission in ''NexusTheJupiterIncident'', in which you have to fight waves of entire fleets of enemies, has the possiblity of you getting reinforcements in the face of a [[LizardFolk Gorg]] warship captained by Chief Zatuk, the Gorg ruler. Slight subversion in that Zatuk never wanted to fight humans or the Vardrag, but the Gorg society is heavily clan-based, and it's several powerful clans who wish to fight.
* The penultimate mission in ''NexusTheJupiterIncident'', in which you have to fight waves of entire fleets of enemies, has the possiblity of you getting reinforcements in the face of a [[LizardFolk Gorg]] warship captained by Chief Zatuk, the Gorg ruler. Slight subversion in that Zatuk never wanted to fight humans or the Vardrag, but the Gorg society is heavily clan-based, and it's several powerful clans who wish to fight.
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* [[VideoGame/TeamFortress2 ''VideoGame/TeamFortress2'' - RED and BLU]] BLU are joining forces against a robotic gray team in the [[http://www.teamfortress.com/mvm/ Mann vs. Machine]] update.
* The penultimate mission in ''NexusTheJupiterIncident'', in which you have to fight waves of entire fleets of enemies, has the possiblity of you getting reinforcements in the face of a [[LizardFolk Gorg]] warship captained by Chief Zatuk, the Gorg ruler. Slight subversion in that Zatuk never wanted to fight humans or the Vardrag, but the Gorg society is heavily clan-based, and it's several powerful clans who wish tofight.fight.
* ''VideoGame/HalfLife'' - HECU and Black Ops are both there to kill Freeman and fight against each other.
* The penultimate mission in ''NexusTheJupiterIncident'', in which you have to fight waves of entire fleets of enemies, has the possiblity of you getting reinforcements in the face of a [[LizardFolk Gorg]] warship captained by Chief Zatuk, the Gorg ruler. Slight subversion in that Zatuk never wanted to fight humans or the Vardrag, but the Gorg society is heavily clan-based, and it's several powerful clans who wish to
* ''VideoGame/HalfLife'' - HECU and Black Ops are both there to kill Freeman and fight against each other.
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** In the ''Omega DLC'', [[NobleDemon Aria T'Loak]] recruits Shepard to help her retake Omega. After her initial plan of attack fails, she's forced to enlist many of the gangs that formerly opposed her, (including one lead by a former lover), in order to form a rebel army capable of driving Cerberus from the station.
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* In the ''{{Franchise/Super Mario|Bros}}'' {{R|olePlayingGame}}PGs, Bowser will often team up with Mario against other villains, wanting to be the only villain around. He's particularly enraged when other villains inevitably kidnap Princess Peach in the course of their plans.
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* In the ''{{Franchise/Super Mario|Bros}}'' {{R|olePlayingGame}}PGs, Bowser will often team up with Mario against other villains, wanting to be the only villain around. He's particularly enraged when other villains inevitably kidnap Princess Peach in the course of their plans. Or when someone has the nerve to kick him out of his own castle, like Smithy does, he's not going to let old rivalries keep him from getting it back.
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* ''VideoGame/FireEmblem'' uses this and does ''not'' SnapBack. The phrase is even used to describe Marth in ''VideoGame/SuperSmashBros. Brawl''.
** A mission in FireEmblemAwakening has your group picking a side between two rival mercenary factions. If you refuse to pick a side, they both gang up on you.
** A mission in FireEmblemAwakening has your group picking a side between two rival mercenary factions. If you refuse to pick a side, they both gang up on you.
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* ''VideoGame/FireEmblem'' ''Franchise/FireEmblem'' uses this and does ''not'' SnapBack. The phrase is even used to describe Marth in ''VideoGame/SuperSmashBros. Brawl''.
** A mission inFireEmblemAwakening ''VideoGame/FireEmblemAwakening'' has your group picking a side between two rival mercenary factions. If you refuse to pick a side, they both gang up on you.
** A mission in
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** A mission in FireEmblemAwakening has your group picking a side between two rival mercenary factions. If you refuse to pick a side, they both gang up on you.
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-->'''[[spoiler:Price]]:''' Makarov, you ever heard the old saying "the enemy of my enemy is my friend"?\\
'''Makarov:''' [[spoiler:Price]], one day you're going to find that cuts both ways.
'''Makarov:''' [[spoiler:Price]], one day you're going to find that cuts both ways.
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*** The original game also has a brief moment of this. [[spoiler: The first time Magneto confronts the X-Men, the entire mansion gets attacked by an army of sentinels, causing the X-Men and Magneto's forces to fight alongside each other against the mutant-hunting robots.]]
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** In ''LightNovel/FateZero'', there also was such a scenario against Servant Caster. Such servant and his Master, Ryuunosuke Uryuu, were brutal {{Serial Killer}}s and their favorite preys were [[HarmfulToMinors children]], so the whole Grail War was temporarily put on hold ''solely'' to get them taken down. '''That's how bad the situation was'''. [[spoiler: Ultimately, Ryuunosuke is sniped down by Kiritsugu, and after this Caster and a monster he had summoned are defeated by Saber.]]
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** In ''LightNovel/FateZero'', there also was such a scenario against Servant Caster. Such servant and his Master, Ryuunosuke Uryuu, were brutal {{Serial Killer}}s and their favorite preys were [[HarmfulToMinors children]], so the whole Grail War was temporarily put on hold ''solely'' to get them taken down. '''That's how bad the situation was'''. [[spoiler: Ultimately, Ryuunosuke is sniped down by Kiritsugu, and after this Caster and a monster he had summoned are defeated by Saber.Saber, but only with the assistance of Rider and Lancer.]]
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** The entire ''Galaxy'' unites because of this in ''3''. Most of the various forces bitterly hate each other but can be convinced to fight side-by-side, including the Turians and Krogans, the Quarians and the Geth, the Humans and Batarians etc. The Rachni, once the bane of the Galaxy, also can become allied forces [[IOweYouMyLife due to their debt]] to Shepard.
** [[spoiler: In the ''Leviathan DLC'', Shepard manages to broker an alliance with the race the pre-dated the Reapers. However, the [[EldritchAbomination Leviathan]] make it very clear that the only reason they are helping is because they see the Reapers as having stolen the Galaxy from ''them'' and, since they consider themselves to be [[AGodAmI God-like]], are rather pissed off that the Reapers never paid proper "''tribute''" to them.]]
** [[spoiler: In the ''Leviathan DLC'', Shepard manages to broker an alliance with the race the pre-dated the Reapers. However, the [[EldritchAbomination Leviathan]] make it very clear that the only reason they are helping is because they see the Reapers as having stolen the Galaxy from ''them'' and, since they consider themselves to be [[AGodAmI God-like]], are rather pissed off that the Reapers never paid proper "''tribute''" to them.]]
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** The entire ''Galaxy'' unites because of this in ''3''. Most of the various forces bitterly hate each other but can be convinced to fight side-by-side, including the Turians and Krogans, the Quarians and the Geth, the Humans and Batarians etc. The Rachni, once the bane of the Galaxy, also can become allied forces [[IOweYouMyLife due to their debt]] to Shepard.
Shepard. The GodzillaThreshold has a way of making everyone come together.
** [[spoiler: In the ''Leviathan DLC'', Shepard manages to broker an alliance with the race the pre-dated the Reapers. However, the [[EldritchAbominationLeviathan]] Leviathans]] make it very clear that the only reason they are helping is because they see the Reapers as having stolen the Galaxy from ''them'' and, since they consider themselves to be [[AGodAmI God-like]], are rather pissed off that the Reapers never paid proper "''tribute''" to them.]]
** [[spoiler: In the ''Leviathan DLC'', Shepard manages to broker an alliance with the race the pre-dated the Reapers. However, the [[EldritchAbomination
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* ''VideoGame/MassEffect2'' has Commander Shepard brought back to life by [[WellIntentionedExtremist The Illusive Man]], who may have been responsible for killing his/her squad in the Sole Survivor backstory, in order to combat the EldritchAbomination out to wipe out humanity, even willing to recruit notably {{Badass}} aliens. Particularly relevant if Shepard is played as Paragon, who does not hesitate to tell TIM that he/she's barely tolerant of his organization only because [[TheCassandra no one else will help him/her]] and in the end [[spoiler:can deny him the Collector Base and technology to "secure human dominance"]].
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* ''VideoGame/MassEffect2'' has Commander Shepard brought back to life by [[WellIntentionedExtremist The Illusive Man]], who may have been responsible for killing his/her squad in the Sole Survivor backstory, in order to combat the EldritchAbomination HumongousMecha EldritchAbominations out to wipe out humanity, humanity (and all galactic civilization, but Mr. Illusive doesn't really care about them), even willing to recruit notably {{Badass}} aliens. Particularly relevant if Shepard is played as Paragon, who does not hesitate to tell TIM that he/she's barely tolerant of his organization only because [[TheCassandra no one else will help him/her]] and in the end [[spoiler:can deny him the Collector Base and technology to "secure human dominance"]].
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** Which got its own moments of temporal alliances, such as the War of the Shifting Sands, the Opening of the Dark Portal (where the Horde and Alliance came to the aid of a neutral faction holding back demonic forces coming through the portal), and most recently, the Shattered Sun Offensive. At the same time though, both sides keep fighting in arenas, battlegrounds and the open world.
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** Which got its own moments of temporal alliances, such as the War of the Shifting Sands, and the Opening of the Dark Portal (where the Horde and Alliance came to the aid of a neutral faction holding back demonic forces coming through the portal), and most recently, the Shattered Sun Offensive. At the same time though, both sides keep fighting in arenas, battlegrounds and the open world.portal).
** The opening cinematic of ''Mists of Pandaria'' has a shipwrecked orc and human trying to kill each other, then teaming up against a lone Pandaren who interrupts their fight. Doesn't keep them from getting their clocks cleaned.
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** The opening cinematic of ''Mists of Pandaria'' has a shipwrecked orc and human trying to kill each other, then teaming up against a lone Pandaren who interrupts their fight. Doesn't keep them from getting their clocks cleaned.
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* In ''VideoGame/DragonAge'', [[spoiler: after punching some sense into Loghain's thick skull and overthrowing him from the throne, you can choose to spare him from execution and instead conscript him to the Wardens as a chance of redemption. He will then join your party and help you fight the Blight at the cost of Alistair, who will be so outraged with the decision of pardoning Loghain that he will leave.]]
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* In ''VideoGame/DragonAge'', [[spoiler: after punching some sense into Loghain's thick skull and overthrowing him from the throne, you can choose to spare him from execution and instead conscript him to the Wardens as a chance of redemption. He will then join your party and help you fight the Blight at the cost of Alistair, who will be so outraged with the decision of pardoning Loghain that he will leave.]]]]
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* Can happen in ''VideoGame/DragonAgeII'', depending on your choices and who you side with in the end. No matter how you feel about the mage/templar conflict, many people will probably side with the mages just to piss [[KnightTemplar Mere]][[ObviouslyEvil dith]] off. Also, this is Fenris' opinion on fighting alongside mages, particularly Merrill, with the implication that he won't straight-up gut them because of loyalty to Hawke.
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* Can happen in ''VideoGame/DragonAgeII'', depending on your choices and who you side with in the end. No matter how you feel about the mage/templar conflict, many people will probably side with the mages just to piss [[KnightTemplar Mere]][[ObviouslyEvil dith]] off. Also, this is Fenris' opinion on fighting alongside mages, particularly Merrill, with the implication that he won't straight-up gut them because of loyalty to Hawke. The unique buff you get for a Rival Fenris is "Enemy of my Enemy".
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** Similarly, if you choose to side with the mages in the final confrontation and coerce Fenris/Aveline into joining you, or vice versa with the Templars and Merrill/Anders.
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** Similarly, if you choose to side with the mages in the final confrontation and coerce Fenris/Aveline into joining you, or vice versa with the Templars and Merrill/Anders. The first three are possible with Friendship or Rivalry, but it specifically takes a maxed-out rivalry meter for Anders to swap sides.
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* A fandom example has unified the BrokenBase of the [[VideoGame/SpyroTheDragon Spyro fans.]] Both groups have come together to say NOTHING good can come from {{VideoGame/Skylanders|SpyrosAdventure}}.
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* A fandom example has unified the BrokenBase of the [[VideoGame/SpyroTheDragon Spyro fans.]] Both groups have come together to say NOTHING good can come from {{VideoGame/Skylanders|SpyrosAdventure}}.''VideoGame/{{Skylanders}}''.
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* In ''Battlezone: Rise of the Black Dogs'', the Americans and (remnants of) the Soviets team up to take down the Furies (alien spaceships brought back by the Soviets). In fact there is even a rescue mission before the team-up mission, in which you have to rescue the Soviet survivors (the Furies rebelled after taking down the Black Dogs (third faction and the one used to create the Furies in the first place).
* In ''VideoGame/FinalFantasyX2'', the Leblanc Syndicate, who are enemies originally, become allies of the Gullwings in Chapter 3. This is different, however, in that they remain allies for the rest of the game, even helping in the fight against [[spoiler:Vegnagun]].
* In ''VideoGame/CityOfHeroes'', in the Valentine's Day 2006 and 2007 events, the missions to unlock special prizes required mixed hero-villain teams to complete. As well, the issue 10 update included a whole hero-villain co-op zone, the Rikti War Zone.
** Issue 12 added Cimerora, another co-op zone.
*** Finally, the annual "Rescue Baby New Year" event allows heroes and villains to team up, explicitly because the kidnapping of said baby/personification of time would be [[TheEndOfTheWorldAsWeKnowIt really really bad]] for all concerned.
* Happens quite often in ''VideoGame/MetalSlug''. Twice, the Rebellion teams up with you to fight the Mars People: in ''Metal Slug 2'' when the Mars People betray them and kidnap their leader, and again in ''Metal Slug 3'' when their leader turns out to be a Martian impostor. Even the ultimate recurring rival and badass Sgt. Allen O'Neill fights on your side. In ''Metal Slug 6'', both groups team up with you to fight a group of Martian-eating aliens.
* In the ''{{Franchise/Super Mario|Bros}}'' {{R|olePlayingGame}}PGs, Bowser will often team up with Mario against other villains, wanting to be the only villain around. He's particularly enraged when other villains inevitably kidnap Princess Peach in the course of their plans.
** In ''[[VideoGame/MarioAndLuigiBowsersInsideStory Mario & Luigi: Bowser's Inside Story]]'', he does this completely ''unknowingly''. He doesn't know that the bros are in his gut. All he knows is that Fawful has ''his'' castle, and is trying to kidnap ''his'' princess and take over ''his'' Mushroom Kingdom. Mario and Luigi do their part behind the scenes, even during the {{Final B|oss}}attle.
* ''Franchise/{{Halo}}'' does this ''twice''. First, at the end of the second game in the series, the human UNSC and the Elites, who were previously mortal enemies, join forces to fight the Prophet of Truth, who is planning to exterminate the former and betray the latter. Later on, right before confronting the Prophet himself, the Master Chief and the Arbiter join forces with [[spoiler: the Flood]] to stop Truth from killing ''everyone'' in the galaxy.
** Granted, this latter alliance lasts only five minutes, and then you curse their sudden yet inevitable betrayal. Although they did at least have the minimal grace to wait until Truth was dead first.
*** Like you could ''really'' trust the Gravemind.
*** The full extent of the human/Elite alliance is explored in the ending of ''VideoGame/{{Halo 3}}''. [[spoiler: The human general says that he can never forgive the Elites for what they did as part of the Covenant, and also as part of alliance (razing most of Africa to stop the Flood), but implies that they just might be able to ''ignore each other'' until some time in the future when the pain of the war isn't as fresh.]] They're not really enemies anymore, but they're definitely not friends.
*** Likewise, some of the Elites will grudgingly admit to actually having some respect for humanity now. Humanity might be inferior to the Elites on a physical level, massively outnumbered and hopelessly outgunned, but if you look at some of the things the UNSC have done... then even some of the most stubborn of the Elites have admitted that they just got their asses kicked into the Stone Age by a bunch of bloody monkeys, and actually respect humanity for its stubbornness, resourcefulness and bloody-minded persistence in the face of overwhelming odds. It helps that the Elites are a bunch of {{Proud Warrior Race Guy}}s and respect for honorable and skilled fighters how their culture works.
**** Supplementary materials like the short stories that came with the collectors' editions establish that the humans had indeed earned the grudging respect of the Elites, because they were doing comparatively well in the war despite inferior numbers and technology (turning what should have been a speedbump for the Covenant into a pyrrhic victory). Further, these materials establish that the Elites are very confused why the Prophets are strictly pursuing a genocidal war of annihilation against the humans (which is secretly because the humans are the ''real'' successors to the Forerunners, not the Prophets). It turns out that, if this were just a normal Covenant war of expansion, after so many years of impressive fighting, if the Elites were in charge they would have offered humanity the option to surrender by now, and join the Covenant. They'd be slave-soldiers, but it wouldn't be the genocide the Prophets were planning. Further, the Elites think humans would be a huge step up from their current frontline soldiers, the Grunts.
** Speaking of Bungie, while it isn't exactly an example of this trope, you do join forces with the Pfhor in ''VideoGame/{{Marathon}}'', and you do so because if you do, [[BigBad Tycho]] will decide to keep T'fear from killing all of the humans. It doesn't really matter, since you just go to an alternate reality after he tries to kill you for trying to escape slavery.
* In ''VideoGame/DevilMayCry 3'', hero Dante teams up with his brother and enemy Vergil to fight the penultimate boss. It's barely cold when Vergil challenges Dante for ownership of the [[InfinityPlusOneSword Force Edge]].
* ''VideoGame/StarCraft'' is full of those, especially in the ExpansionPack. It starts with Raynor being forced to team up with the Sons of Korhal to evacuate his {{Doomed Home|town}}planet and ends up with a three-way alliance between the Terrans, Protoss ''and'' Zerg against the Earth Directorate and immature Overmind they were trying to control.
** In ''VideoGame/StarCraftII: Wings of Liberty'', [[spoiler: during the final arc, Raynor join forces with the [[TheEmpire Terran dominion]], or at least some Dominion forces led by Prince Valerian, who explicitly does not have his father's approval, against Kerrigan. This time, it works.]]
* ''VideoGame/{{Warcraft}}'', borrowing some plot elements from ''StarCraft'', also has quite a few such moments, the ultimate being the battle at Mt. Hyjal where the Alliance, the Horde and the previously hostile to both night elves put their differences aside to stop the demons. Only to have the Alliance (now including the night elves) and the Horde break apart in about 4 years in time for the next game in the setting, ''VideoGame/WorldOfWarcraft''.
** Which got its own moments of temporal alliances, such as the War of the Shifting Sands, the Opening of the Dark Portal (where the Horde and Alliance came to the aid of a neutral faction holding back demonic forces coming through the portal), and most recently, the Shattered Sun Offensive. At the same time though, both sides keep fighting in arenas, battlegrounds and the open world.
** In ''Burning Crusade'', there are Aldor and Scryers factions in Shattrath City which are rivals of each other on the borders of open hostilities. Players have to pick between them and befriending one means you are hostile to the other. However, near the conclusion of Burning Crusade during the Sunwell event, they finally put aside their differences and band together to form the Shattered Sun Offensive against Kael'thas Sunstrider and Kil'jaeden.
** Another was added in ''Wrath of the Lich King'', though it borders on BigDamnHeroes. The Alliance and the Horde work together at the Wrathgate in fighting the Scourge, which stands in contrast to them murdering each other for resources and fun everywhere else.
** In fact, a massive part of ''Wrath'' is how the Horde and Alliance start with this and end trying to kill each other and letting the Lich King off to the side to kill them both. In ''Cataclysm'', Deathwing has become a greater threat than the Scourge was because the Alliance and Horde have lost all pretense of working together on anything.
** In "Rise of the Zandalari", Vol'jin, leader of the Horde's Darkspear Trolls, is so concerned about the Zandalar's SuddenSequelHeelSyndrome, that he sends emissaries to both the Horde and the Alliance. Instead of trying to get Warchief Hellscream and King Wrynn to work together, he reaches out to the individual heroes, and the smaller groups within the Horde and Alliance that are directly in the trolls' path.
** ''Mists of Pandaria'' has the Klaxxi, a group of Mantid elders who seek outside help when the Sha corrupt their current empress; however, they have no intention of stopping the [[BugWar millenia-long war]] with the rest of Pandaria, and worship the [[EldritchAbomination Old God]] Y'Shaarj. If Y'Shaarj should ever return, they would serve him again, and if the players were smart [[JoinOrDie they would too]].
** The opening cinematic of ''Mists of Pandaria'' has a shipwrecked orc and human trying to kill each other, then teaming up against a lone Pandaren who interrupts their fight. Doesn't keep them from getting their clocks cleaned.
* Occurs in ''[[VideoGame/MightAndMagic Might and Magic VII]]'', with reformed MagnificentBastard Archibald Ironfist assisting the party in rescuing his brother King Roland and taking on the Kreegans.
** The climax of the [[VideoGame/HeroesOfMightAndMagic Restoration Wars]] featured a team-up between Catherine Ironfist and a faction of Necromancers that had gotten tired of Catherine's father's rule (events earlier in the story had lead to his reanimation at the Necromancers' hands, only for him to promptly off their king and take control himself).
** ''Might and Magic VIII'' plays with it: on the one hand, the BigBad gives you as much help as he ''can'' give. On the other hand, the only reason he is your enemy is because of a safety protocol intended to keep him from being subverted by the Kreegans (he cannot stop once he has started the destruction of a world), so him trying to sidestep it as much as is possible is only to be expected.
* With the ''VideoGame/StarFox'' team mostly disbanded at the beginning of ''Star Fox Command'' and Fox unable (or unwilling) to get his friends back together, one of the paths you can take has Fox hiring long time rival Wolf O'Donnel to help him defeat the BigBad.
** And going back to ''VideoGame/StarFoxAssault'', Wolf helps Fox rid the menace of the Aparoids in the last four missions.
* Plenty in ''VideoGame/SuperSmashBros Brawl'':
** Marth and Meta Kight fighting, then [[spoiler: suddenly teaming up to defeat the Primids around them]]. [[spoiler: This happens again when Meta Knight fights Lucario then immediately after the fierce battle that manages to turn one of them into a trophy, they team up to board the Halberd. This almost happens again when they find Solid Snake, but Lucario stops Meta Knight. Meta Knight has an interesting way to make new friends...]]
** Ancient Minister [[spoiler: aka a R.O.B. unit]] helping [[spoiler: Donkey Kong, Diddy Kong, Captain Falcon, Pikachu, Samus, and Captain Olimar]].
** King Dedede (by Ness and Luigi), Bowser (by King Dedede, who pointed out that there's a bigger enemy, [[spoiler: Tabuu]]), Ganondorf (by Link and Zelda) and Wario (who kicks King Dedede, which King Dedede, Luigi, and Ness respond to by pointing out [[spoiler:Tabuu]] to Wario, who looks uninterested. When they decide to move on without him, he races past on his bike and beats them to the BigBad's final dungeon).
* A comedic example is shown in ''VideoGame/CommandAndConquerRedAlert3'' where the three factions (represented by their respective tanks) call a truce in the tutorial in order to teach the player not to send their units to their meaningless deaths, though are still prone to firing at each other. Usually at [[ButtMonkey the Soviet Hammer tank]].
** A more serious example is also to be found in the Allied campaign when the Empire of the Rising Sun attacks-the Allies and Soviets call a ceasefire to destroy the Empire, and proceed to betray each other at about the same time.
** This also occurs in the ''Tiberium'' series. In the expansion pack ''Tiberian Sun: Firestorm'', the remnants of Nod and GDI have to work together to stop the renegade Nod AI, CABAL. In ''Tiberium Wars'', Nod general Kilian Qatar allies with GDI to face off against the Scrin, until Kane reveals himself to be not quite dead, flips out, and orders GDI nuked.
** Happens in the ''Yuri's Revenge'' expansion to ''VideoGame/CommandAndConquerRedAlert2'' as well, when the Soviets and Allies team up to fight Yuri.
* This occurs in ''VideoGame/KingdomHeartsII'' when [[spoiler: Maleficent]] teams up with Sora against Organization XIII.
** Interestingly, you never really see [[spoiler: Maleficent]] and Pete ''helping'', just getting ready in a BolivianArmyEnding kind of way. Sora mentions that they've found something worth fighting for, and then ''we never see them again''. Things are back to normal as of [[VideoGame/KingdomHeartsCoded Coded]] though.
** And also briefly when Axel fights alongside Sora to defeat a load of Nobodies. Since Roxas was lost, he became more of a WildCard character, and from there was slowly molded into a SixthRanger. And it's sealed when [[spoiler:he performs a HeroicSacrifice by taking out an army of ]][[spoiler:[[RedshirtArmy Dusks]]]][[spoiler: with a DangerousForbiddenTechnique, then uses the last of his power]] to open the gate to [[SupervillainLair The World That Never Was.]]
* ''VideoGame/SuperRobotWarsDestiny'' is an interesting example. While the game includes antagonists from ''[[Anime/MobileSuitGundamZZ Gundam ZZ]]'', ''[[Anime/MobileSuitGundamCharsCounterattack Char's Counterattack]]'', and ''[[Anime/MobileSuitGundamWing Gundam Wing]]'', the situation at hand causes them to have the competence to ally with you all at the start since things are bad enough. Due to the [[Anime/MobileSuitVictoryGundam Zanscare Empire]] attacking Earth, along with the [[Manga/GetterRobo Invaders]], and the [[Anime/{{Macross7}} Protodevlin]], and the united alien forces of the villains from ''[[Anime/MiraiRoboDaltanious Daltanius]]'', ''Anime/{{Godmars}}'', and ''[[Anime/UFORoboGrendizer Grendizer]]'', your heroes quickly realize the only organizations out there that still have the sheer manpower to defend humanity are the Principality of Zeon and the Order of the Zodiac. [[Anime/TheBigO Roger Smith]] takes care of the negotiations. This results in the first ''heroic'' roles for longstanding villains like [[LadyOfWar Haman Karn]] and Treize Kushinada.
** ''VideoGame/SuperRobotWars'' likes to play with this in smaller ways as well. For instance, ''SuperRobotWarsW'' has a stage where [[Anime/TekkamanBlade Tekkaman Evil]] is forced to (briefly) work with the heroes because of the takeover of Tokyo by the [[GaoGaiGar Zonder]]. On the Selena route of ''SuperRobotWarsAlpha 3'', not only does Selena herself spend some time assisting the [[Anime/MobileSuitGundamSEED Cruscet team]], Andrew Waltfeld and his adjutant Martin Dacosta assist the Alpha Numbers in holding off an attack by the [[{{Macross7}} Barota]] in a later stage.
*** One OG example is when Sanger and Elzam storm the Tesla Liecht Institute to retrieve the Dynamic General Guardians being kept there from the Inspectors. When Sanger's Grungust Type-3 gets damaged, the Inspector Vigagi is about to land a fatal blow when Wodan Ymir appears and intervenes, claiming that he is the [[TheOnlyOneAllowedToDefeatYou only one allowed to kill Sanger]]. Wodan buys enough time for Sanger to activate the Dygenguard, and goes so far as to be the one who helps Sanger retrieve his Type-3 Zankantou (a job that was given to Elzam in Alpha 2) to continue fighting when Dygenguard's original weapons malfunction.
**** In the final episode of ''The Inspector'' anime, [[TheHero Kyosuke]] and [[TheRival Axel]] end up working together to take down the BigBad.
*** ''VideoGame/SuperRobotWarsEX'' is an interesting case because some of the characters you can recruit ARE enemies in their respective series that are cooperating because they are stuck in La Gias with no way back. Shu's route is unique because the only ''heroes'' you actually can recruit (on that route) are the [=GoShogun=] team and [[Anime/MobileSuitZetaGundam Quattro]]. The rest are all villains like [[Anime/AuraBattlerDunbine Todd Guiness]] and [[Anime/MobileSuitZetaGundam Jerid Messa]].
** Some of the secret recruitable characters in these games are often enemy characters, such as [[Anime/MobileSuitGundamThe08thMSTeam Norris Packard]], [[Anime/TurnAGundam Gym Ghingaham]], [[Anime/BrainPowerd Jonathan Glenn and Quincy Issa]], and [[Anime/GunXSword Michael Garret and Fasalina]], just to name a few.
* This happens ''three'' times with {{Stripperiffic}} Pokémon Pincher admin Blue Eyes in the third ''VideoGame/PokemonRanger'' game. Two of these times, you even get to [[SaveTheVillain save her life.]] [[spoiler: After the second time, Blue Eyes pulls an official HeelFaceTurn.]]
* Pyron is the BigBad of the first two ''VideoGame/{{Darkstalkers}}'' games, despite many of the other characters being less than savory themselves.
* If ''Kid Dracula'' and ''VideoGame/{{Castlevania}} Judgment'' are any indication, Galamoth's presence is all it takes for Dracula and his minions to become {{Anti Hero}}es.
* ''{{Spider-Man Friend or Foe}}'' has the entire premise of its story built around this trope. The story involves several prominent members of Spider-Man's RoguesGallery being mind controlled by another villain. Spider-Man subsequently confronts the mind controlled villains and frees them from the mind control, at which point they readily agree to join forces with Spider-Man to find, and exact their revenge upon, the one who was mind controlling them.
* In ''VideoGame/SpiderManWebOfShadows'', Spider-Man decides to break the evil mad scientist known as the Tinkerer out of Ryker's Island to get him to build a device capable of decimating Venom's symbiote army... if only because ReedRichardsIsUseless by being absent when he tried to phone him, [[Comicbook/IronMan Tony Stark]] and [[Comicbook/{{X-Men}} Hank McCoy]] are also absent, and he doesn't feel like dealing with Hank Pym. The mission where you do so also involves another Enemy Mine --- namely, freeing the Rhino and '''riding him''' to break through the island prison's walls. Some time later, when the Tinkerer requests that he be transferred over to the Kingpin's facilities to complete the device, Spidey and SHIELD end up forming one with the crime boss as well.
** Notable in that Spider-Man fully acknowledges that breaking out the Tinkerer is a bad idea, and he doesn't like it (unless you're playing the evil path), but that the threat of the symbiote army is so great that he really can't wait for anyone else to show up and help him solve the problem. This and other questionable actions get him in a ''lot'' of trouble when {{Wolverine}} shows up and [[WhatTheHellHero calls him out]].
** There's also the possibility for a ''third'', very temporary Enemy Mine. In order to ''get'' to Ryker's you have to make one of the "good or bad" choices that are sprinkled throughout the game. Choosing the bad option has you get a ride there from the Vulture. (In case you're wondering the good option is a ride from MoonKnight.)
*** In the DS version, you can also choose the ''Dark'' path by helping the Green Goblin.
* The plot of the ''WesternAnimation/KimPossible'' LicensedGame "What's the Switch?", featuring a reluctant team-up by Shego and Kim.
* ''VideoGame/ManaKhemiaAlchemistsOfAlRevis'': Hilariously played with; the TrueCompanions go into the depths of a monster-infested dungeon, trying to find the cure for an ailing friend, and found themselves mobbed by monsters. Then comes the game's GoldfishPoopGang (doubtful of the status as ''real'' enemies). They think they're going to cause trouble again, only to find that the latter group, under orders, is there to help them. Made even funnier by the following dialogs. During their arrival:
-->"Not now..."\\
"We don't have time to play with you!"
::The second dialogue is that after they reveal their plans, and persuade the heroes to make their escape with the medicine:
-->'''Renee:''' ...Umm, maybe you shoulda been honest and let them help.\\
'''Tony:''' Don't be stupid! Coming to their rescue to ask for help? That's just uncool.
* In ''VideoGame/TheWorldEndsWithYou'', at one point, Neku and his partner see two JerkAss Reapers getting attacked by Taboo Noise. At this point you have the choice of helping the Reapers or letting them fight it off on their own. Hilariously, if you choose to help, Neku justifies it by saying it'll really annoy them, since Reapers are supposed to be killing Players, not being helped by them, and if you choose to leave them to their fate, Neku justifies by saying, "''Just for you, Jerk face!''"
* In ''VideoGame/SonicAdventure2'', Franchise/SonicTheHedgehog teamed up with [[BigBad Dr. Eggman]] and the rest of the Dark Story characters to stop the Space Colony ARK's automated "apocalypse" function, which is mainly [[ColonyDrop the station de-orbiting to crash into the planet, presumably blowing up both if it had hit.]]
** Sonic and Eggman teamed up again in ''[[VideoGame/SonicAdvanceTrilogy Sonic Advance 3]]'' to stop the [[OneWingedAngel out-of-control, Chaos Emerald-enhanced]] Gemerl from destroying the world.
** Subverted in the DS version of ''VideoGame/MarioAndSonicAtTheOlympicGames''. When Toad mistakes Omega as one of Eggman's loyal robots, Omega states that Dr. Eggman is in fact his enemy. Toad questions Omega on his blockade using this trope's logic, only for Omega to simply respond with "Unverified" and restate his threat to the team. As you can guess, he does not end up assisting the team, instead preferring to take on Eggman himself. [[LampshadeHanging It comes as a surprise to Toad.]]
* In the intro to ''VideoGame/MortalKombatDeception,'' Raiden, Shang Tsung, and Quan Chi attempt to fight that game's BigBad, the Dragon King Onaga. Unfortunately, when Raiden realizes that they aren't doing any damage... [[spoiler:he causes an explosion that appears to kill himself and the sorcerers while obliterating the palace they were in. And Onaga was unscathed.]]
** Additionally, this occurs in both sides of the story mode for ''VideoGame/MortalKombatVsDCUniverse''.
* In ''VideoGame/TalesOfSymphonia'' Lloyd's group joins up with Sheena, their [[HitmanwithaHeart enemy]] in order to save a village from [[NebulousEvilOrganisation the]] [[ANaziByAnyOtherName Desians]].
** [[spoiler:Kratos after his betrayal, when you invade Forcystus' human ranch]]
* ''VideoGame/XMenLegends II'' had the Comicbook/{{X-Men}} and their old enemies the Brotherhood teaming up to fight the forces of Apocalypse, who had abducted members of both teams.
** Some are happier about it than others. ScarletWitch and Toad get along great with the X-Men and become quite friendly, while Magneto simply tolerates them, and Sabretooth and Juggernaut are constantly taking verbal potshots at the X-Men all game.
** As for its successor series, ''VideoGame/MarvelUltimateAlliance 2'' does it as well: this is how the game segues from an adaptation of the ''Comicbook/CivilWar'' to Vicarious Visions' original storyline, as the Negative Zone brawl is interrupted by [[spoiler:SHIELD's nanites gaining sentience and beginning an AssimilationPlot]], forcing the pro- and anti-registration heroes to put their political squabble aside. And it kinda does not snapback, for when is all said and done, the Civil War is settled peacefully, [[MultipleEndings the winning side being the one you chose at the beginning of it]].
* The Turks, {{Punchclock Villain}}s from ''VideoGame/FinalFantasyVII'', find themselves briefly fighting alongside the heroes in an effort to save kidnapped Optional Members of both teams.
** The Turks attempt to help in ''Anime/FinalFantasyVIIAdventChildren''... '''[[TheWorfEffect attempt]]''' being the main word here. Lucky they've got [[TheChessmaster Rufus Shinra]].
* In the first ''VideoGame/{{Thief}}'', there's actually a mission named ''Strange Bedfellows'', in which [[spoiler:the main character agrees to help the KnightTemplar Hammerite faction in exchange for their help against the Pagan BigBad]]. In the second game, [[spoiler:the main character teams up with the survivors of the Pagans against a Hammerite splinter group]]. In the third game, it's possible to ally with ''both'' the Pagans and Hammerites if you get your reputation with both groups high enough. [[spoiler: they'll even help you out in the insane Finale after the BigBad declares war on the city. Granted, they (and everyone else in the city) will fight the Big Bad's creatures even if you didn't ally with them earlier, but unless you ally with them they'll also attack you as well.]]
* ''VideoGame/FireEmblem'' uses this and does ''not'' SnapBack. The phrase is even used to describe Marth in ''VideoGame/SuperSmashBros. Brawl''.
* In ''VisualNovel/PhoenixWrightAceAttorney'', [[spoiler: the fifth case practically loses the prosecution as both Phoenix and Edgeworth fight to reveal the true killer, Damon Gant]].
** Then in ''Justice For All'' a similar arrangement is made where [[spoiler: both Phoenix and Edgeworth attempt to prolong the trial as long as possible in order so the police might discover where the kidnapped Maya has been brought.]]
** In ''Trials and Tribulations'', [[spoiler: Edgeworth]] actually takes over the defense for the case since Phoenix [[spoiler: was stupid enough to run across a burning bridge a hundred feet over a freezing river and is incapacitated.]] To make it even more interesting, he [[spoiler: gets Franziska to serve as the prosecution, as she's the only one who wouldn't point out to the (new) judge that Edgeworth is actually a prosecutor and not a defense attorney.]]
* Halfway through ''[[VideoGame/NintendoWars Advance Wars: Days of Ruin]]'' (after [[spoiler:Captain Brenner is killed]]), Tasha, Gage and the surviving Lazurians temporarily set aside their differences with Will and the 12th Battalion to help him stop Admiral Greyfield's New Rubinelle Army from launching missile strikes against them.
* ''[[VideoGame/NicktoonsUnite Nicktoons: Globs of Doom]]'' has WesternAnimation/{{SpongeBob|SquarePants}}, WesternAnimation/DannyPhantom, [[WesternAnimation/TheAdventuresOfJimmyNeutronBoyGenius Jimmy Neutron]], and {{VideoGame/Tak|AndThePowerOfJuju}} joining forces with [[LegionOfDoom an evil syndicate]] (hired by Jimmy), [[WesternAnimation/InvaderZim Zim and Dib]] to defeat an invasion of cyclops slimes from outer space. At the same time, Zim (a VillainProtagonist and [[TheOnlyOneAllowedToDefeatYou seeing only himself as worthy of conquering Earth]]) abuses the situation to his advantage by lying his way to the heroes' side, leaving Dib stuck with the villains, much to his dismay. Even after ''they'' SnapBack, as he's still complaining [[ButtMonkey but to no avail]].
* At the end of ''VideoGame/{{Bomberman}} 64'', halfway through the final battle against [[spoiler:Sirius]] -- the MagnificentBastard who used the hero throughout most of the game -- [[spoiler:Regulus]], who was presumed dead earlier appears and saves Bomberman's life at the last second. After some dialogue, [[spoiler:Regulus]] forms a temporary alliance with Bomberman to take down [[spoiler:Sirius]]. He even helps Bomberman escape the collapsing fortress before reminding him that they aren't friends and they will fight again.
* Shirou and [[spoiler:Kotomine]] in Heavens Feel route of ''VisualNovel/FateStayNight''. They're both very clear on the fact that they're doing it for entirely different reasons and that after cooperating, they're enemies again. Still, it leads Shirou to realize that he actually ''likes'' [[spoiler:Kotomine]] and that's why he avoids him. They're not actually that different apart from the whole, you know, evil [[ForTheEvulz for the fun of it]] factor.
** And in ''Unlimited Blade Works'', [[spoiler:Lancer]] joins forces with Shirou and Rin against [[spoiler:Caster and Archer]] on the orders of his master, [[spoiler:which would be Kotomine again]]. He even sticks around to [[spoiler:save Rin from Archer]] just because he feels like it afterwards, despite technically being their enemy.
** The entire mechanics of the Holy Grail War encourage/force the Masters to get into such scenarios, since with seven factions battling each other, there will always somebody trying to score a kill while two others are fighting or an enemy one can't beat alone. Technically, Shirou's and Rin's alliance started out this way, but they never got to duke it out in the end.
** In ''LightNovel/FateZero'', there also was such a scenario against Servant Caster. Such servant and his Master, Ryuunosuke Uryuu, were brutal {{Serial Killer}}s and their favorite preys were [[HarmfulToMinors children]], so the whole Grail War was temporarily put on hold ''solely'' to get them taken down. '''That's how bad the situation was'''. [[spoiler: Ultimately, Ryuunosuke is sniped down by Kiritsugu, and after this Caster and a monster he had summoned are defeated by Saber.]]
* In one of the path branches in ''VideoGame/DevilSurvivor'', [[spoiler:Midori]] teams up with [[spoiler:Kaido]] to keep [[spoiler:Keisuke]] from pulling a KarmaHoudini and getting away with his KnightTemplar stint without a fight. She does so hoping she can restrain [[spoiler:Kaido]] from ''killing'' him, but wonders about her ability to do so a ''tad'' too late.
* The freeware game ''VideoGame/{{Sonny}}'' has the titular character and [[CombatMedic Veradux]] to team up with Galiant, an elite soldier of Zombie Pest Control Inc., by pretending they're also ZPCI soldiers, to fight the super-powerful zombie Baron Brixius. Once that's done, however, Sonny and Veradux decide to take Galiant out before he finds out they're actually zombies too, and he thus becomes the game's FinalBoss.
* ''VideoGame/BatenKaitos'' has [[spoiler: Aimee and Folon]] helping the main party to infiltrate the ''The Very Definite Final Dungeon'' despite having fought the group multiple times over the course of the game.
* ''VideoGame/CallOfDuty: VideoGame/ModernWarfare 2'' has the appropriately named level "The Enemy of My Enemy":
-->'''[[spoiler:Price]]:''' Makarov, you ever heard the old saying "the enemy of my enemy is my friend"?\\
'''Makarov:''' [[spoiler:Price]], one day you're going to find that cuts both ways.
* In ''VideoGame/TheGodfather: The Game'', in the cutscene of [[spoiler: Sonny's death]] you can clearly see mobsters from the Tattaglia, Stracci and Cuneo families working together against the victim.
* ''VideoGame/OverlordII'' has the EvilOverlord offered an alliance by the BigGood Queen Fay, ruler of Light Magic to take down the [[FantasticRacism magic-destroying]] [[TheEmpire Glorious Empire]]. She helps by reconstructing the [[ArtifactOfDoom Tower Heart]] of the first game and sacrifices her temples to power it up. When that proves to be insufficient, [[spoiler:she decides that she'll have to sacrifice her own magical energy and allows the Overlord to drain her. However due to his evil influence seeping through her body she is eventually driven insane, becoming the FallenHero Dark Fay who joins the Overlord as his mistress.]]
** Ssssssort of. Queen Fay [[spoiler:turns into Dark Fay from being exposed to too much of your Evil Presence spell (Force Lightning and a Jedi Mind Trick in one.) This leads to Corruption... Unless you decide to "overcharge" her and explode her, for Destruction points. She still joins you, only this time she's a spirit. The real kicker? Dark Fay is more explicitly evil and violent, while Ghost Fay is more [[CloudCuckoolander innocent and aloof]]. Corruption gets you a WoobieDestroyerOfWorlds, Destruction gets you an artistic, aethereal sidekick.]]
* In ''VideoGame/ChronoTrigger'', you can choose to add Magus to your team.
* ''VideoGame/CrashTwinsanity'' makes this into a game feature by making Dr. Cortex a total ButtMonkey. Crash and Cortex being forced to work together usually means whacking enemies with Cortex, tossing Cortex over a gap for him to do something, clearing his path while he runs in a screaming panic, using him as a snowboard, or controlling the two as a BigBallOfViolence when Cortex decides to beat up Crash.
* ''VideoGame/StarOceanTillTheEndOfTime'' lets you choose whether to add Albel Nox to your party. Or is it a HeelFaceTurn on Albel's part? Hm.
** You really have no choice as he's forced to join your group temporarily anyway as part of a larger enemy mine situation with the two warring kingdoms vs the invading aliens. Afterwards the war is resolved peacefully. The only optional part is whether you choose to have Albel join you for the rest of the game, or send him back to the army that loaned him to you.
** He only turns up to join permanently if you go through a private action with him earlier and tell him you're not his enemy. He genuinely doesn't want to be your enemy, regardless of common threats.
* ''VideoGame/MassEffect2'' has Commander Shepard brought back to life by [[WellIntentionedExtremist The Illusive Man]], who may have been responsible for killing his/her squad in the Sole Survivor backstory, in order to combat the EldritchAbomination out to wipe out humanity, even willing to recruit notably {{Badass}} aliens. Particularly relevant if Shepard is played as Paragon, who does not hesitate to tell TIM that he/she's barely tolerant of his organization only because [[TheCassandra no one else will help him/her]] and in the end [[spoiler:can deny him the Collector Base and technology to "secure human dominance"]].
** Tali also hates Cerberus with a passion and [[UndyingLoyalty she only joins the mission to help Shepard.]]
** And finally Liara worked with Cerberus herself so they could bring Shepard back because [[UndyingLoyalty she couldn't let her friend (or more) go.]]
** The 2nd game even features a villainous example: the vigilante Archangel does such a good job of ruining the collective days of Blue Suns, Eclipse, and the Blood Pack mercenary gangs that they ''all'' team up to take him down, despite usually being at each other's throats.
** ''Franchise/MassEffect'' runs on this trope anyway. You gather a team of people from various species, and almost all of them are at least a bit prejudiced against the other races due to past events such as the First Contact War and the krogan genophage. They all end up working together to save the universe from a common threat. One of those people you can recruit is [[spoiler:Morinth, Samara's sociopathic daughter, who intended to add Shepard to her long list of DeathBySex victims.]]
** The geth and the ''Reapers'' do this in ''[[VideoGame/MassEffect3 3]]''. Having declined an alliance with the "Old Machines" once before, the geth are forced to reconsider after the quarians try to wipe them out for the second time in three centuries. Faced with creators who seemingly refuse to treat them as equals and no help from any other organics, they decide that giving up their free will is preferable to being exterminated. It takes the combined efforts of Shepard, Legion, Tali and Zaal'Koris to get both species out of ''that'' mess intact.
** The entire ''Galaxy'' unites because of this in ''3''. Most of the various forces bitterly hate each other but can be convinced to fight side-by-side, including the Turians and Krogans, the Quarians and the Geth, the Humans and Batarians etc. The Rachni, once the bane of the Galaxy, also can become allied forces [[IOweYouMyLife due to their debt]] to Shepard.
** [[spoiler: In the ''Leviathan DLC'', Shepard manages to broker an alliance with the race the pre-dated the Reapers. However, the [[EldritchAbomination Leviathan]] make it very clear that the only reason they are helping is because they see the Reapers as having stolen the Galaxy from ''them'' and, since they consider themselves to be [[AGodAmI God-like]], are rather pissed off that the Reapers never paid proper "''tribute''" to them.]]
* This is the best way to describe the relationship between ''VideoGame/KaneAndLynch''. They consistently hate each other throughout the game since Lynch was originally a thug hired by TheSyndicate to watch Kane. HilarityEnsues as Lynch's AxCrazy nature gets the better of him...
* The Creator/CartoonNetwork MMO ''VideoGame/FusionFall'' has the heroes and enemies generally working together against [[BigBad Fuse]]. Mojo Jojo even provides the main fast-travel in the game. There are exceptions, though (a recent story arc has [[WesternAnimation/{{Ben 10}} Vilgax screwing things up for Ben]]).
* In ''VideoGame/{{Prototype}}'', [[ArmiesAreEvil Blackwatch]] works with Alex Mercer to defend the Bloodtox Pump from the Infected, and there are also side-events scattered around the city that involve fighting with the Marines or Blackwatch to beat the Infected. However, other than these few exceptions, Mercer and the Military are mortal enemies.
* Briefly in the first two ''VideoGame/{{Uncharted}}'' games.
** The original has [[spoiler: Nathan Drake and Eddy Raja versus the Spaniard zombie-thingies.]]
** Whereas in the sequel [[spoiler:the Guardians of Shambhala attack, and [[TheHero Nathan Drake]] is forced to work together with [[TheDragon Harry Flynn.]] ]]
* In ''{{Freespace}}'', the Terran-Vasudan War comes to an abrupt halt with the appearance of the Shivans, who are trying to kill both of them. Since the Shivans are more than capable of wiping out both species, the two agree to a cease-fire to deal with the common threat. The cease-fire holds and eventually becomes the foundation for an alliance between the two species.
** In the fan-made ''BluePlanet'' expansion, events transpire such that both the Terran forces of the GTVA and the UEF respond to a Vasudan ship in distress. The captains of both ships agree to set aside the war for the moment to rescue the Vasudans, and the deployed fighters make small talk with their opposite numbers. [[spoiler:It all falls apart when a second UEF ship arrives and, not knowing of the cease-fire, obliterates the GTVA ship. The UEF commanders were furious, since it made them look very, very bad in front of the Vasudans, with whom they had hoped to win political favor.]]
* In ''[[VideoGame/FirstEncounterAssaultRecon F.E.A.R. 3]]'', Paxton teams up with the ex-FEAR commando Point Man.
* Raikov's recruitment in ''VideoGame/MetalGearSolidPortableOps'' was mostly due to this trope, as he seemed to hate Gene enough to even ally himself with Naked Snake mostly to get revenge on Gene for humiliating him and locking him up (In case why it is worded this way, its because he has a lot of hate towards Naked Snake because [[spoiler: he was involved with the death of his lover, Colonel Volgin, in ''VideoGame/MetalGearSolid3SnakeEater''.]]) Roy Campbell even lampshades this by quoting the adage "The Enemy's Enemy is my Friend" during both the mission briefing and the radio call at the start of the mission.
* The whole point of the ''VideoGame/WarriorsOrochi'' games; all of the characters contained within are from either the Three Kingdoms period of China's history or the Warring States period of Japan's, and many of the characters are sworn enemies. However, a few of the Dream Mode stages in ''Warriors Orochi 2'' ''specifically'' invoke this trope by teaming up characters who normally hate each other, such as the stage where ''VideoGame/DynastyWarriors'' Guan Yu, Xiahou Dun, and Lu Meng team up to rescue Liu Chan from ''VideoGame/{{Samurai Warrior|s}}'' character Hideyoshi Toyotomi.
* In ''VideoGame/DragonAge'', [[spoiler: after punching some sense into Loghain's thick skull and overthrowing him from the throne, you can choose to spare him from execution and instead conscript him to the Wardens as a chance of redemption. He will then join your party and help you fight the Blight at the cost of Alistair, who will be so outraged with the decision of pardoning Loghain that he will leave.]]
** Also shows up in the myriad groups you are assigned to recruit; though nowhere so much as the Dalish working alongside humans.
** Even the ''Warden'' can be played like this with the Dalish and Dwarven backgrounds, not interested in ending the Blight so much for Ferelden's sake, but to prevent it from spreading and affecting ''their'' people.
--> '''Loghain''': Pray our King is admenable to reason.
--> '''Dalish Warden / Dwarf Warden''': The Dalish have ''no'' Kings! / He's not ''my'' King!
* Can happen in ''VideoGame/DragonAgeII'', depending on your choices and who you side with in the end. No matter how you feel about the mage/templar conflict, many people will probably side with the mages just to piss [[KnightTemplar Mere]][[ObviouslyEvil dith]] off. Also, this is Fenris' opinion on fighting alongside mages, particularly Merrill, with the implication that he won't straight-up gut them because of loyalty to Hawke.
** In the Mark of the Assassins DLC, Tallis is revealed to be working for the Qunari, who are feared by the rest of Ferelden. This quickly earns her the scorn of most party members since they're technically now working to save a group that most of them despises.
** Similarly, if you choose to side with the mages in the final confrontation and coerce Fenris/Aveline into joining you, or vice versa with the Templars and Merrill/Anders.
** Explicity stated to be the relationship between Mage!Hawke and Knight-Commander Meredith. She only lets Hawke continue to roam free because it's more useful to turn their magic against Kirkwall's enemies. That, and, she's utterly ''terrified'' of them!
* In ''[[VideoGame/{{Battlefield}} Battlefield 2: Modern Combat]]'', [[spoiler: when it is revealed that both NATO and China were misled into warring with each other by a third faction.]]
* ''VideoGame/SystemShock 2'' features the return of SHODAN, a rogue ArtificialIntelligence who was the BigBad of the original. The player joins SHODAN in a battle against a common enemy, The Many.
** When you enter [[spoiler: Polito's office]], SHODAN tells you that the reason she wants you to get rid of the Many is because they turned against her after the Hacker sabotaged her on Citadel Station. The Many grew up without her tutelage, and they decided that they hated the mechanical ways of SHODAN and wanted all of the universe to be covered in their organic ways.
* ''VideoGame/AdventureQuestWorlds'' has King Alteon and Gravelyn, Sepulchure's daughter, into forming a Great Truce between Good and Evil to deal with the threat of Drakath and his forces of Chaos, including the 13 Lords of Chaos.
* In the indie FPS ''Bet On Soldier'', you spend most of the game fighting through the Bet On Soldier tournament in order to confront the [=BOS=] [[WorldsStrongestMan World Champion]], Igor Boryenka, who you believe to be responsible for the murder of your wife. Once you finally defeat Boryenka, the real BigBad punishes you both by forcing the two of you to fight together in an Arena deathmatch against wave after wave of the best fighters in the [=BOS=] League. It's actually a pretty cool level, since Boryenka retains his boss-like health and damage output, but the sheer number and skill of opponents the two of you face make it seemingly impossible for him to survive to the end.
* In ''VideoGame/FalloutNewVegas'', if you take the [=NCR=], Mr. House or Independent path and complete sidequests pertaining to said factions, it's possible to have the [=NCR=], Brotherhood of Steel, Great Khans and [[spoiler: former Enclave soldiers]] fighting together against Caesar's Legion in the final battle for Hoover Dam. This is notable because most of those groups have been mortal enemies of the NCR throughout history, with [[spoiler: the Enclave]] having been the BigBad of the previous two games.
* Near the end of ''VideoGame/{{Crysis}} 2'', the remaining members of the [=CELL=] [=PMC=] that has spent the entire game trying to kill you end up teaming up with you against the Ceph alien invasion, because their dying boss makes it clear to them that their entire chain of command is now dead and you are now humanity's last hope for stopping the aliens.
* In ''VideoGame/{{Portal 2}}'', [[spoiler:GLaDOS, or rather, [[ItMakesSenseInContext GLaDOS inside of a potato]],]] joins up with main character Chell after GLaDOS is switched out of the main core, and pulls a HeelFaceTurn some time later.
-->'''GLaDOS''':[[spoiler:"Look, even if you think we're still enemies, we're enemies with a common interest. Revenge. You like revenge right? Everybody likes revenge. SO LET'S GO GET SOME!"]]
* In ''VideoGame/{{Xenonauts}}'' the US and USSR work together against the alien threat.
* A fandom example has unified the BrokenBase of the [[VideoGame/SpyroTheDragon Spyro fans.]] Both groups have come together to say NOTHING good can come from {{VideoGame/Skylanders|SpyrosAdventure}}.
* In the Sundown Kid's chapter in ''VideoGame/LiveALive'', Sundown Kid is being relentlessly pursued by the bounty hunter Mad Dog. They put their duel on hold when the town they stopped at is attacked by Odie's gang of outlaws. After working together to defeat Odie, Mad Dog will immediately try to settle things with Sundown once and for all, to the strong protests of the townspeople they just saved. Sundown can either finish off Mad Dog or spare him to fight another day.
* In the remake of ''VideoGame/TheTowerOfDruaga'' for the PCEngine, Gilgamesh, instead of killing the Succubus, must convince her to help him so he can get the Blue Crystal Rod and defeat Druaga.
* One mission in ''VideoGame/PerfectDark'' sees protagonist Joanna Dark, captured by Skedar in the mission beforehand, locked in the same cell as the head of the very organisation the game [[FromBadToWorse squares you up against]], Cassandra de Vries. [[spoiler:She willingly gives her life to allow Joanna to escape.]]
* In the ''[[VideoGame/TheElderScrollsVSkyrim Skyrim]]'' quest ''Cure For Madness'', you have to hunt down [[spoiler:Cicero]] after he apparently turns rogue and attacks [[spoiler:Astrid]]. However, you can choose to spare his life, and later he will act as a follower for you. Similarly you can play as an Imperial, High Elf, Dark Elf, etc whilst working for the Stormcloaks (who are known for the xenophobia of some members).
* ''VideoGame/{{Solatorobo}}'' has the [[PrivateMilitaryContractors Kurvasz]] [[AdventureGuild Hunters]], Howler {{Sky Pirate}}s, and a ''train conductor'' join forces to [[spoiler:procure a powerful bomb to help in the fight against Tartaros.]]
* ''VideoGame/NeverwinterNights2'' has an example that would not be allowed in a pen-and-paper game of ''TabletopGame/DungeonsAndDragons''. Namely, having [[ThePaladin Casavir]] and/or a paladin [[PlayerCharacter Knight-Captain]] work side-by-side with [[TokenEvilTeammate Bishop]] (ChaoticEvil ranger) and [[DealWithTheDevil Ammon Jerro]] (NeutralEvil warlock). Thankfully the "Code of Conduct" paladin class feature is not present in ''[=NWN2=]'', or else the game would be {{unwinnable|By Mistake}} since Jerro is the undisputed expert on the BigBad.
* The final chapter of ''VideoGame/BaldursGateDarkAlliance 2'' has The Hero, Jherek the Harper, and Kharne the Zhentarim mercenary team up against the vampire Mordoc Selanmere.
* Mid- to late-game players of recent games in the ''[[VideoGame/{{X}} X-Universe]]'' series can befriend the {{Yak|uza}}i faction by various means. They can then make use of their NGOSuperpower status to steal ships from "Return Ship" missions, by docking the ship at the shipyard in Senator's Badlands. The SpacePolice sent to destroy the stolen ship will spawn and immediately come under attack by the Yaki, [[CurbStompBattle who have an Akuma destroyer at their disposal]].
* In ''VideoGame/KidIcarusUprising'', immediately after a MeleeATrois between Pit, [[spoiler:Viridi's Forces of Nature]], and [[spoiler:Hades's Underworld forces]], the fight is put on hold to deal with [[spoiler:an alien invasion]] out of nowhere. Though [[spoiler:Hades]] still can't resist dropping a ChestMonster in Pit's path at every opportunity, [[spoiler:Viridi]] takes to the team-up very well, and remains a tenuous ally for the rest of the game.
* ''VideoGame/AlienVsPredatorCapcom'' has two Predators helping the humans hunt down Aliens on Earth.
* [[VideoGame/TeamFortress2 RED and BLU]] are joining forces against a robotic gray team in the [[http://www.teamfortress.com/mvm/ Mann vs. Machine]] update.
* The penultimate mission in ''NexusTheJupiterIncident'', in which you have to fight waves of entire fleets of enemies, has the possiblity of you getting reinforcements in the face of a [[LizardFolk Gorg]] warship captained by Chief Zatuk, the Gorg ruler. Slight subversion in that Zatuk never wanted to fight humans or the Vardrag, but the Gorg society is heavily clan-based, and it's several powerful clans who wish to fight.
* In ''VideoGame/FinalFantasyX2'', the Leblanc Syndicate, who are enemies originally, become allies of the Gullwings in Chapter 3. This is different, however, in that they remain allies for the rest of the game, even helping in the fight against [[spoiler:Vegnagun]].
* In ''VideoGame/CityOfHeroes'', in the Valentine's Day 2006 and 2007 events, the missions to unlock special prizes required mixed hero-villain teams to complete. As well, the issue 10 update included a whole hero-villain co-op zone, the Rikti War Zone.
** Issue 12 added Cimerora, another co-op zone.
*** Finally, the annual "Rescue Baby New Year" event allows heroes and villains to team up, explicitly because the kidnapping of said baby/personification of time would be [[TheEndOfTheWorldAsWeKnowIt really really bad]] for all concerned.
* Happens quite often in ''VideoGame/MetalSlug''. Twice, the Rebellion teams up with you to fight the Mars People: in ''Metal Slug 2'' when the Mars People betray them and kidnap their leader, and again in ''Metal Slug 3'' when their leader turns out to be a Martian impostor. Even the ultimate recurring rival and badass Sgt. Allen O'Neill fights on your side. In ''Metal Slug 6'', both groups team up with you to fight a group of Martian-eating aliens.
* In the ''{{Franchise/Super Mario|Bros}}'' {{R|olePlayingGame}}PGs, Bowser will often team up with Mario against other villains, wanting to be the only villain around. He's particularly enraged when other villains inevitably kidnap Princess Peach in the course of their plans.
** In ''[[VideoGame/MarioAndLuigiBowsersInsideStory Mario & Luigi: Bowser's Inside Story]]'', he does this completely ''unknowingly''. He doesn't know that the bros are in his gut. All he knows is that Fawful has ''his'' castle, and is trying to kidnap ''his'' princess and take over ''his'' Mushroom Kingdom. Mario and Luigi do their part behind the scenes, even during the {{Final B|oss}}attle.
* ''Franchise/{{Halo}}'' does this ''twice''. First, at the end of the second game in the series, the human UNSC and the Elites, who were previously mortal enemies, join forces to fight the Prophet of Truth, who is planning to exterminate the former and betray the latter. Later on, right before confronting the Prophet himself, the Master Chief and the Arbiter join forces with [[spoiler: the Flood]] to stop Truth from killing ''everyone'' in the galaxy.
** Granted, this latter alliance lasts only five minutes, and then you curse their sudden yet inevitable betrayal. Although they did at least have the minimal grace to wait until Truth was dead first.
*** Like you could ''really'' trust the Gravemind.
*** The full extent of the human/Elite alliance is explored in the ending of ''VideoGame/{{Halo 3}}''. [[spoiler: The human general says that he can never forgive the Elites for what they did as part of the Covenant, and also as part of alliance (razing most of Africa to stop the Flood), but implies that they just might be able to ''ignore each other'' until some time in the future when the pain of the war isn't as fresh.]] They're not really enemies anymore, but they're definitely not friends.
*** Likewise, some of the Elites will grudgingly admit to actually having some respect for humanity now. Humanity might be inferior to the Elites on a physical level, massively outnumbered and hopelessly outgunned, but if you look at some of the things the UNSC have done... then even some of the most stubborn of the Elites have admitted that they just got their asses kicked into the Stone Age by a bunch of bloody monkeys, and actually respect humanity for its stubbornness, resourcefulness and bloody-minded persistence in the face of overwhelming odds. It helps that the Elites are a bunch of {{Proud Warrior Race Guy}}s and respect for honorable and skilled fighters how their culture works.
**** Supplementary materials like the short stories that came with the collectors' editions establish that the humans had indeed earned the grudging respect of the Elites, because they were doing comparatively well in the war despite inferior numbers and technology (turning what should have been a speedbump for the Covenant into a pyrrhic victory). Further, these materials establish that the Elites are very confused why the Prophets are strictly pursuing a genocidal war of annihilation against the humans (which is secretly because the humans are the ''real'' successors to the Forerunners, not the Prophets). It turns out that, if this were just a normal Covenant war of expansion, after so many years of impressive fighting, if the Elites were in charge they would have offered humanity the option to surrender by now, and join the Covenant. They'd be slave-soldiers, but it wouldn't be the genocide the Prophets were planning. Further, the Elites think humans would be a huge step up from their current frontline soldiers, the Grunts.
** Speaking of Bungie, while it isn't exactly an example of this trope, you do join forces with the Pfhor in ''VideoGame/{{Marathon}}'', and you do so because if you do, [[BigBad Tycho]] will decide to keep T'fear from killing all of the humans. It doesn't really matter, since you just go to an alternate reality after he tries to kill you for trying to escape slavery.
* In ''VideoGame/DevilMayCry 3'', hero Dante teams up with his brother and enemy Vergil to fight the penultimate boss. It's barely cold when Vergil challenges Dante for ownership of the [[InfinityPlusOneSword Force Edge]].
* ''VideoGame/StarCraft'' is full of those, especially in the ExpansionPack. It starts with Raynor being forced to team up with the Sons of Korhal to evacuate his {{Doomed Home|town}}planet and ends up with a three-way alliance between the Terrans, Protoss ''and'' Zerg against the Earth Directorate and immature Overmind they were trying to control.
** In ''VideoGame/StarCraftII: Wings of Liberty'', [[spoiler: during the final arc, Raynor join forces with the [[TheEmpire Terran dominion]], or at least some Dominion forces led by Prince Valerian, who explicitly does not have his father's approval, against Kerrigan. This time, it works.]]
* ''VideoGame/{{Warcraft}}'', borrowing some plot elements from ''StarCraft'', also has quite a few such moments, the ultimate being the battle at Mt. Hyjal where the Alliance, the Horde and the previously hostile to both night elves put their differences aside to stop the demons. Only to have the Alliance (now including the night elves) and the Horde break apart in about 4 years in time for the next game in the setting, ''VideoGame/WorldOfWarcraft''.
** Which got its own moments of temporal alliances, such as the War of the Shifting Sands, the Opening of the Dark Portal (where the Horde and Alliance came to the aid of a neutral faction holding back demonic forces coming through the portal), and most recently, the Shattered Sun Offensive. At the same time though, both sides keep fighting in arenas, battlegrounds and the open world.
** In ''Burning Crusade'', there are Aldor and Scryers factions in Shattrath City which are rivals of each other on the borders of open hostilities. Players have to pick between them and befriending one means you are hostile to the other. However, near the conclusion of Burning Crusade during the Sunwell event, they finally put aside their differences and band together to form the Shattered Sun Offensive against Kael'thas Sunstrider and Kil'jaeden.
** Another was added in ''Wrath of the Lich King'', though it borders on BigDamnHeroes. The Alliance and the Horde work together at the Wrathgate in fighting the Scourge, which stands in contrast to them murdering each other for resources and fun everywhere else.
** In fact, a massive part of ''Wrath'' is how the Horde and Alliance start with this and end trying to kill each other and letting the Lich King off to the side to kill them both. In ''Cataclysm'', Deathwing has become a greater threat than the Scourge was because the Alliance and Horde have lost all pretense of working together on anything.
** In "Rise of the Zandalari", Vol'jin, leader of the Horde's Darkspear Trolls, is so concerned about the Zandalar's SuddenSequelHeelSyndrome, that he sends emissaries to both the Horde and the Alliance. Instead of trying to get Warchief Hellscream and King Wrynn to work together, he reaches out to the individual heroes, and the smaller groups within the Horde and Alliance that are directly in the trolls' path.
** ''Mists of Pandaria'' has the Klaxxi, a group of Mantid elders who seek outside help when the Sha corrupt their current empress; however, they have no intention of stopping the [[BugWar millenia-long war]] with the rest of Pandaria, and worship the [[EldritchAbomination Old God]] Y'Shaarj. If Y'Shaarj should ever return, they would serve him again, and if the players were smart [[JoinOrDie they would too]].
** The opening cinematic of ''Mists of Pandaria'' has a shipwrecked orc and human trying to kill each other, then teaming up against a lone Pandaren who interrupts their fight. Doesn't keep them from getting their clocks cleaned.
* Occurs in ''[[VideoGame/MightAndMagic Might and Magic VII]]'', with reformed MagnificentBastard Archibald Ironfist assisting the party in rescuing his brother King Roland and taking on the Kreegans.
** The climax of the [[VideoGame/HeroesOfMightAndMagic Restoration Wars]] featured a team-up between Catherine Ironfist and a faction of Necromancers that had gotten tired of Catherine's father's rule (events earlier in the story had lead to his reanimation at the Necromancers' hands, only for him to promptly off their king and take control himself).
** ''Might and Magic VIII'' plays with it: on the one hand, the BigBad gives you as much help as he ''can'' give. On the other hand, the only reason he is your enemy is because of a safety protocol intended to keep him from being subverted by the Kreegans (he cannot stop once he has started the destruction of a world), so him trying to sidestep it as much as is possible is only to be expected.
* With the ''VideoGame/StarFox'' team mostly disbanded at the beginning of ''Star Fox Command'' and Fox unable (or unwilling) to get his friends back together, one of the paths you can take has Fox hiring long time rival Wolf O'Donnel to help him defeat the BigBad.
** And going back to ''VideoGame/StarFoxAssault'', Wolf helps Fox rid the menace of the Aparoids in the last four missions.
* Plenty in ''VideoGame/SuperSmashBros Brawl'':
** Marth and Meta Kight fighting, then [[spoiler: suddenly teaming up to defeat the Primids around them]]. [[spoiler: This happens again when Meta Knight fights Lucario then immediately after the fierce battle that manages to turn one of them into a trophy, they team up to board the Halberd. This almost happens again when they find Solid Snake, but Lucario stops Meta Knight. Meta Knight has an interesting way to make new friends...]]
** Ancient Minister [[spoiler: aka a R.O.B. unit]] helping [[spoiler: Donkey Kong, Diddy Kong, Captain Falcon, Pikachu, Samus, and Captain Olimar]].
** King Dedede (by Ness and Luigi), Bowser (by King Dedede, who pointed out that there's a bigger enemy, [[spoiler: Tabuu]]), Ganondorf (by Link and Zelda) and Wario (who kicks King Dedede, which King Dedede, Luigi, and Ness respond to by pointing out [[spoiler:Tabuu]] to Wario, who looks uninterested. When they decide to move on without him, he races past on his bike and beats them to the BigBad's final dungeon).
* A comedic example is shown in ''VideoGame/CommandAndConquerRedAlert3'' where the three factions (represented by their respective tanks) call a truce in the tutorial in order to teach the player not to send their units to their meaningless deaths, though are still prone to firing at each other. Usually at [[ButtMonkey the Soviet Hammer tank]].
** A more serious example is also to be found in the Allied campaign when the Empire of the Rising Sun attacks-the Allies and Soviets call a ceasefire to destroy the Empire, and proceed to betray each other at about the same time.
** This also occurs in the ''Tiberium'' series. In the expansion pack ''Tiberian Sun: Firestorm'', the remnants of Nod and GDI have to work together to stop the renegade Nod AI, CABAL. In ''Tiberium Wars'', Nod general Kilian Qatar allies with GDI to face off against the Scrin, until Kane reveals himself to be not quite dead, flips out, and orders GDI nuked.
** Happens in the ''Yuri's Revenge'' expansion to ''VideoGame/CommandAndConquerRedAlert2'' as well, when the Soviets and Allies team up to fight Yuri.
* This occurs in ''VideoGame/KingdomHeartsII'' when [[spoiler: Maleficent]] teams up with Sora against Organization XIII.
** Interestingly, you never really see [[spoiler: Maleficent]] and Pete ''helping'', just getting ready in a BolivianArmyEnding kind of way. Sora mentions that they've found something worth fighting for, and then ''we never see them again''. Things are back to normal as of [[VideoGame/KingdomHeartsCoded Coded]] though.
** And also briefly when Axel fights alongside Sora to defeat a load of Nobodies. Since Roxas was lost, he became more of a WildCard character, and from there was slowly molded into a SixthRanger. And it's sealed when [[spoiler:he performs a HeroicSacrifice by taking out an army of ]][[spoiler:[[RedshirtArmy Dusks]]]][[spoiler: with a DangerousForbiddenTechnique, then uses the last of his power]] to open the gate to [[SupervillainLair The World That Never Was.]]
* ''VideoGame/SuperRobotWarsDestiny'' is an interesting example. While the game includes antagonists from ''[[Anime/MobileSuitGundamZZ Gundam ZZ]]'', ''[[Anime/MobileSuitGundamCharsCounterattack Char's Counterattack]]'', and ''[[Anime/MobileSuitGundamWing Gundam Wing]]'', the situation at hand causes them to have the competence to ally with you all at the start since things are bad enough. Due to the [[Anime/MobileSuitVictoryGundam Zanscare Empire]] attacking Earth, along with the [[Manga/GetterRobo Invaders]], and the [[Anime/{{Macross7}} Protodevlin]], and the united alien forces of the villains from ''[[Anime/MiraiRoboDaltanious Daltanius]]'', ''Anime/{{Godmars}}'', and ''[[Anime/UFORoboGrendizer Grendizer]]'', your heroes quickly realize the only organizations out there that still have the sheer manpower to defend humanity are the Principality of Zeon and the Order of the Zodiac. [[Anime/TheBigO Roger Smith]] takes care of the negotiations. This results in the first ''heroic'' roles for longstanding villains like [[LadyOfWar Haman Karn]] and Treize Kushinada.
** ''VideoGame/SuperRobotWars'' likes to play with this in smaller ways as well. For instance, ''SuperRobotWarsW'' has a stage where [[Anime/TekkamanBlade Tekkaman Evil]] is forced to (briefly) work with the heroes because of the takeover of Tokyo by the [[GaoGaiGar Zonder]]. On the Selena route of ''SuperRobotWarsAlpha 3'', not only does Selena herself spend some time assisting the [[Anime/MobileSuitGundamSEED Cruscet team]], Andrew Waltfeld and his adjutant Martin Dacosta assist the Alpha Numbers in holding off an attack by the [[{{Macross7}} Barota]] in a later stage.
*** One OG example is when Sanger and Elzam storm the Tesla Liecht Institute to retrieve the Dynamic General Guardians being kept there from the Inspectors. When Sanger's Grungust Type-3 gets damaged, the Inspector Vigagi is about to land a fatal blow when Wodan Ymir appears and intervenes, claiming that he is the [[TheOnlyOneAllowedToDefeatYou only one allowed to kill Sanger]]. Wodan buys enough time for Sanger to activate the Dygenguard, and goes so far as to be the one who helps Sanger retrieve his Type-3 Zankantou (a job that was given to Elzam in Alpha 2) to continue fighting when Dygenguard's original weapons malfunction.
**** In the final episode of ''The Inspector'' anime, [[TheHero Kyosuke]] and [[TheRival Axel]] end up working together to take down the BigBad.
*** ''VideoGame/SuperRobotWarsEX'' is an interesting case because some of the characters you can recruit ARE enemies in their respective series that are cooperating because they are stuck in La Gias with no way back. Shu's route is unique because the only ''heroes'' you actually can recruit (on that route) are the [=GoShogun=] team and [[Anime/MobileSuitZetaGundam Quattro]]. The rest are all villains like [[Anime/AuraBattlerDunbine Todd Guiness]] and [[Anime/MobileSuitZetaGundam Jerid Messa]].
** Some of the secret recruitable characters in these games are often enemy characters, such as [[Anime/MobileSuitGundamThe08thMSTeam Norris Packard]], [[Anime/TurnAGundam Gym Ghingaham]], [[Anime/BrainPowerd Jonathan Glenn and Quincy Issa]], and [[Anime/GunXSword Michael Garret and Fasalina]], just to name a few.
* This happens ''three'' times with {{Stripperiffic}} Pokémon Pincher admin Blue Eyes in the third ''VideoGame/PokemonRanger'' game. Two of these times, you even get to [[SaveTheVillain save her life.]] [[spoiler: After the second time, Blue Eyes pulls an official HeelFaceTurn.]]
* Pyron is the BigBad of the first two ''VideoGame/{{Darkstalkers}}'' games, despite many of the other characters being less than savory themselves.
* If ''Kid Dracula'' and ''VideoGame/{{Castlevania}} Judgment'' are any indication, Galamoth's presence is all it takes for Dracula and his minions to become {{Anti Hero}}es.
* ''{{Spider-Man Friend or Foe}}'' has the entire premise of its story built around this trope. The story involves several prominent members of Spider-Man's RoguesGallery being mind controlled by another villain. Spider-Man subsequently confronts the mind controlled villains and frees them from the mind control, at which point they readily agree to join forces with Spider-Man to find, and exact their revenge upon, the one who was mind controlling them.
* In ''VideoGame/SpiderManWebOfShadows'', Spider-Man decides to break the evil mad scientist known as the Tinkerer out of Ryker's Island to get him to build a device capable of decimating Venom's symbiote army... if only because ReedRichardsIsUseless by being absent when he tried to phone him, [[Comicbook/IronMan Tony Stark]] and [[Comicbook/{{X-Men}} Hank McCoy]] are also absent, and he doesn't feel like dealing with Hank Pym. The mission where you do so also involves another Enemy Mine --- namely, freeing the Rhino and '''riding him''' to break through the island prison's walls. Some time later, when the Tinkerer requests that he be transferred over to the Kingpin's facilities to complete the device, Spidey and SHIELD end up forming one with the crime boss as well.
** Notable in that Spider-Man fully acknowledges that breaking out the Tinkerer is a bad idea, and he doesn't like it (unless you're playing the evil path), but that the threat of the symbiote army is so great that he really can't wait for anyone else to show up and help him solve the problem. This and other questionable actions get him in a ''lot'' of trouble when {{Wolverine}} shows up and [[WhatTheHellHero calls him out]].
** There's also the possibility for a ''third'', very temporary Enemy Mine. In order to ''get'' to Ryker's you have to make one of the "good or bad" choices that are sprinkled throughout the game. Choosing the bad option has you get a ride there from the Vulture. (In case you're wondering the good option is a ride from MoonKnight.)
*** In the DS version, you can also choose the ''Dark'' path by helping the Green Goblin.
* The plot of the ''WesternAnimation/KimPossible'' LicensedGame "What's the Switch?", featuring a reluctant team-up by Shego and Kim.
* ''VideoGame/ManaKhemiaAlchemistsOfAlRevis'': Hilariously played with; the TrueCompanions go into the depths of a monster-infested dungeon, trying to find the cure for an ailing friend, and found themselves mobbed by monsters. Then comes the game's GoldfishPoopGang (doubtful of the status as ''real'' enemies). They think they're going to cause trouble again, only to find that the latter group, under orders, is there to help them. Made even funnier by the following dialogs. During their arrival:
-->"Not now..."\\
"We don't have time to play with you!"
::The second dialogue is that after they reveal their plans, and persuade the heroes to make their escape with the medicine:
-->'''Renee:''' ...Umm, maybe you shoulda been honest and let them help.\\
'''Tony:''' Don't be stupid! Coming to their rescue to ask for help? That's just uncool.
* In ''VideoGame/TheWorldEndsWithYou'', at one point, Neku and his partner see two JerkAss Reapers getting attacked by Taboo Noise. At this point you have the choice of helping the Reapers or letting them fight it off on their own. Hilariously, if you choose to help, Neku justifies it by saying it'll really annoy them, since Reapers are supposed to be killing Players, not being helped by them, and if you choose to leave them to their fate, Neku justifies by saying, "''Just for you, Jerk face!''"
* In ''VideoGame/SonicAdventure2'', Franchise/SonicTheHedgehog teamed up with [[BigBad Dr. Eggman]] and the rest of the Dark Story characters to stop the Space Colony ARK's automated "apocalypse" function, which is mainly [[ColonyDrop the station de-orbiting to crash into the planet, presumably blowing up both if it had hit.]]
** Sonic and Eggman teamed up again in ''[[VideoGame/SonicAdvanceTrilogy Sonic Advance 3]]'' to stop the [[OneWingedAngel out-of-control, Chaos Emerald-enhanced]] Gemerl from destroying the world.
** Subverted in the DS version of ''VideoGame/MarioAndSonicAtTheOlympicGames''. When Toad mistakes Omega as one of Eggman's loyal robots, Omega states that Dr. Eggman is in fact his enemy. Toad questions Omega on his blockade using this trope's logic, only for Omega to simply respond with "Unverified" and restate his threat to the team. As you can guess, he does not end up assisting the team, instead preferring to take on Eggman himself. [[LampshadeHanging It comes as a surprise to Toad.]]
* In the intro to ''VideoGame/MortalKombatDeception,'' Raiden, Shang Tsung, and Quan Chi attempt to fight that game's BigBad, the Dragon King Onaga. Unfortunately, when Raiden realizes that they aren't doing any damage... [[spoiler:he causes an explosion that appears to kill himself and the sorcerers while obliterating the palace they were in. And Onaga was unscathed.]]
** Additionally, this occurs in both sides of the story mode for ''VideoGame/MortalKombatVsDCUniverse''.
* In ''VideoGame/TalesOfSymphonia'' Lloyd's group joins up with Sheena, their [[HitmanwithaHeart enemy]] in order to save a village from [[NebulousEvilOrganisation the]] [[ANaziByAnyOtherName Desians]].
** [[spoiler:Kratos after his betrayal, when you invade Forcystus' human ranch]]
* ''VideoGame/XMenLegends II'' had the Comicbook/{{X-Men}} and their old enemies the Brotherhood teaming up to fight the forces of Apocalypse, who had abducted members of both teams.
** Some are happier about it than others. ScarletWitch and Toad get along great with the X-Men and become quite friendly, while Magneto simply tolerates them, and Sabretooth and Juggernaut are constantly taking verbal potshots at the X-Men all game.
** As for its successor series, ''VideoGame/MarvelUltimateAlliance 2'' does it as well: this is how the game segues from an adaptation of the ''Comicbook/CivilWar'' to Vicarious Visions' original storyline, as the Negative Zone brawl is interrupted by [[spoiler:SHIELD's nanites gaining sentience and beginning an AssimilationPlot]], forcing the pro- and anti-registration heroes to put their political squabble aside. And it kinda does not snapback, for when is all said and done, the Civil War is settled peacefully, [[MultipleEndings the winning side being the one you chose at the beginning of it]].
* The Turks, {{Punchclock Villain}}s from ''VideoGame/FinalFantasyVII'', find themselves briefly fighting alongside the heroes in an effort to save kidnapped Optional Members of both teams.
** The Turks attempt to help in ''Anime/FinalFantasyVIIAdventChildren''... '''[[TheWorfEffect attempt]]''' being the main word here. Lucky they've got [[TheChessmaster Rufus Shinra]].
* In the first ''VideoGame/{{Thief}}'', there's actually a mission named ''Strange Bedfellows'', in which [[spoiler:the main character agrees to help the KnightTemplar Hammerite faction in exchange for their help against the Pagan BigBad]]. In the second game, [[spoiler:the main character teams up with the survivors of the Pagans against a Hammerite splinter group]]. In the third game, it's possible to ally with ''both'' the Pagans and Hammerites if you get your reputation with both groups high enough. [[spoiler: they'll even help you out in the insane Finale after the BigBad declares war on the city. Granted, they (and everyone else in the city) will fight the Big Bad's creatures even if you didn't ally with them earlier, but unless you ally with them they'll also attack you as well.]]
* ''VideoGame/FireEmblem'' uses this and does ''not'' SnapBack. The phrase is even used to describe Marth in ''VideoGame/SuperSmashBros. Brawl''.
* In ''VisualNovel/PhoenixWrightAceAttorney'', [[spoiler: the fifth case practically loses the prosecution as both Phoenix and Edgeworth fight to reveal the true killer, Damon Gant]].
** Then in ''Justice For All'' a similar arrangement is made where [[spoiler: both Phoenix and Edgeworth attempt to prolong the trial as long as possible in order so the police might discover where the kidnapped Maya has been brought.]]
** In ''Trials and Tribulations'', [[spoiler: Edgeworth]] actually takes over the defense for the case since Phoenix [[spoiler: was stupid enough to run across a burning bridge a hundred feet over a freezing river and is incapacitated.]] To make it even more interesting, he [[spoiler: gets Franziska to serve as the prosecution, as she's the only one who wouldn't point out to the (new) judge that Edgeworth is actually a prosecutor and not a defense attorney.]]
* Halfway through ''[[VideoGame/NintendoWars Advance Wars: Days of Ruin]]'' (after [[spoiler:Captain Brenner is killed]]), Tasha, Gage and the surviving Lazurians temporarily set aside their differences with Will and the 12th Battalion to help him stop Admiral Greyfield's New Rubinelle Army from launching missile strikes against them.
* ''[[VideoGame/NicktoonsUnite Nicktoons: Globs of Doom]]'' has WesternAnimation/{{SpongeBob|SquarePants}}, WesternAnimation/DannyPhantom, [[WesternAnimation/TheAdventuresOfJimmyNeutronBoyGenius Jimmy Neutron]], and {{VideoGame/Tak|AndThePowerOfJuju}} joining forces with [[LegionOfDoom an evil syndicate]] (hired by Jimmy), [[WesternAnimation/InvaderZim Zim and Dib]] to defeat an invasion of cyclops slimes from outer space. At the same time, Zim (a VillainProtagonist and [[TheOnlyOneAllowedToDefeatYou seeing only himself as worthy of conquering Earth]]) abuses the situation to his advantage by lying his way to the heroes' side, leaving Dib stuck with the villains, much to his dismay. Even after ''they'' SnapBack, as he's still complaining [[ButtMonkey but to no avail]].
* At the end of ''VideoGame/{{Bomberman}} 64'', halfway through the final battle against [[spoiler:Sirius]] -- the MagnificentBastard who used the hero throughout most of the game -- [[spoiler:Regulus]], who was presumed dead earlier appears and saves Bomberman's life at the last second. After some dialogue, [[spoiler:Regulus]] forms a temporary alliance with Bomberman to take down [[spoiler:Sirius]]. He even helps Bomberman escape the collapsing fortress before reminding him that they aren't friends and they will fight again.
* Shirou and [[spoiler:Kotomine]] in Heavens Feel route of ''VisualNovel/FateStayNight''. They're both very clear on the fact that they're doing it for entirely different reasons and that after cooperating, they're enemies again. Still, it leads Shirou to realize that he actually ''likes'' [[spoiler:Kotomine]] and that's why he avoids him. They're not actually that different apart from the whole, you know, evil [[ForTheEvulz for the fun of it]] factor.
** And in ''Unlimited Blade Works'', [[spoiler:Lancer]] joins forces with Shirou and Rin against [[spoiler:Caster and Archer]] on the orders of his master, [[spoiler:which would be Kotomine again]]. He even sticks around to [[spoiler:save Rin from Archer]] just because he feels like it afterwards, despite technically being their enemy.
** The entire mechanics of the Holy Grail War encourage/force the Masters to get into such scenarios, since with seven factions battling each other, there will always somebody trying to score a kill while two others are fighting or an enemy one can't beat alone. Technically, Shirou's and Rin's alliance started out this way, but they never got to duke it out in the end.
** In ''LightNovel/FateZero'', there also was such a scenario against Servant Caster. Such servant and his Master, Ryuunosuke Uryuu, were brutal {{Serial Killer}}s and their favorite preys were [[HarmfulToMinors children]], so the whole Grail War was temporarily put on hold ''solely'' to get them taken down. '''That's how bad the situation was'''. [[spoiler: Ultimately, Ryuunosuke is sniped down by Kiritsugu, and after this Caster and a monster he had summoned are defeated by Saber.]]
* In one of the path branches in ''VideoGame/DevilSurvivor'', [[spoiler:Midori]] teams up with [[spoiler:Kaido]] to keep [[spoiler:Keisuke]] from pulling a KarmaHoudini and getting away with his KnightTemplar stint without a fight. She does so hoping she can restrain [[spoiler:Kaido]] from ''killing'' him, but wonders about her ability to do so a ''tad'' too late.
* The freeware game ''VideoGame/{{Sonny}}'' has the titular character and [[CombatMedic Veradux]] to team up with Galiant, an elite soldier of Zombie Pest Control Inc., by pretending they're also ZPCI soldiers, to fight the super-powerful zombie Baron Brixius. Once that's done, however, Sonny and Veradux decide to take Galiant out before he finds out they're actually zombies too, and he thus becomes the game's FinalBoss.
* ''VideoGame/BatenKaitos'' has [[spoiler: Aimee and Folon]] helping the main party to infiltrate the ''The Very Definite Final Dungeon'' despite having fought the group multiple times over the course of the game.
* ''VideoGame/CallOfDuty: VideoGame/ModernWarfare 2'' has the appropriately named level "The Enemy of My Enemy":
-->'''[[spoiler:Price]]:''' Makarov, you ever heard the old saying "the enemy of my enemy is my friend"?\\
'''Makarov:''' [[spoiler:Price]], one day you're going to find that cuts both ways.
* In ''VideoGame/TheGodfather: The Game'', in the cutscene of [[spoiler: Sonny's death]] you can clearly see mobsters from the Tattaglia, Stracci and Cuneo families working together against the victim.
* ''VideoGame/OverlordII'' has the EvilOverlord offered an alliance by the BigGood Queen Fay, ruler of Light Magic to take down the [[FantasticRacism magic-destroying]] [[TheEmpire Glorious Empire]]. She helps by reconstructing the [[ArtifactOfDoom Tower Heart]] of the first game and sacrifices her temples to power it up. When that proves to be insufficient, [[spoiler:she decides that she'll have to sacrifice her own magical energy and allows the Overlord to drain her. However due to his evil influence seeping through her body she is eventually driven insane, becoming the FallenHero Dark Fay who joins the Overlord as his mistress.]]
** Ssssssort of. Queen Fay [[spoiler:turns into Dark Fay from being exposed to too much of your Evil Presence spell (Force Lightning and a Jedi Mind Trick in one.) This leads to Corruption... Unless you decide to "overcharge" her and explode her, for Destruction points. She still joins you, only this time she's a spirit. The real kicker? Dark Fay is more explicitly evil and violent, while Ghost Fay is more [[CloudCuckoolander innocent and aloof]]. Corruption gets you a WoobieDestroyerOfWorlds, Destruction gets you an artistic, aethereal sidekick.]]
* In ''VideoGame/ChronoTrigger'', you can choose to add Magus to your team.
* ''VideoGame/CrashTwinsanity'' makes this into a game feature by making Dr. Cortex a total ButtMonkey. Crash and Cortex being forced to work together usually means whacking enemies with Cortex, tossing Cortex over a gap for him to do something, clearing his path while he runs in a screaming panic, using him as a snowboard, or controlling the two as a BigBallOfViolence when Cortex decides to beat up Crash.
* ''VideoGame/StarOceanTillTheEndOfTime'' lets you choose whether to add Albel Nox to your party. Or is it a HeelFaceTurn on Albel's part? Hm.
** You really have no choice as he's forced to join your group temporarily anyway as part of a larger enemy mine situation with the two warring kingdoms vs the invading aliens. Afterwards the war is resolved peacefully. The only optional part is whether you choose to have Albel join you for the rest of the game, or send him back to the army that loaned him to you.
** He only turns up to join permanently if you go through a private action with him earlier and tell him you're not his enemy. He genuinely doesn't want to be your enemy, regardless of common threats.
* ''VideoGame/MassEffect2'' has Commander Shepard brought back to life by [[WellIntentionedExtremist The Illusive Man]], who may have been responsible for killing his/her squad in the Sole Survivor backstory, in order to combat the EldritchAbomination out to wipe out humanity, even willing to recruit notably {{Badass}} aliens. Particularly relevant if Shepard is played as Paragon, who does not hesitate to tell TIM that he/she's barely tolerant of his organization only because [[TheCassandra no one else will help him/her]] and in the end [[spoiler:can deny him the Collector Base and technology to "secure human dominance"]].
** Tali also hates Cerberus with a passion and [[UndyingLoyalty she only joins the mission to help Shepard.]]
** And finally Liara worked with Cerberus herself so they could bring Shepard back because [[UndyingLoyalty she couldn't let her friend (or more) go.]]
** The 2nd game even features a villainous example: the vigilante Archangel does such a good job of ruining the collective days of Blue Suns, Eclipse, and the Blood Pack mercenary gangs that they ''all'' team up to take him down, despite usually being at each other's throats.
** ''Franchise/MassEffect'' runs on this trope anyway. You gather a team of people from various species, and almost all of them are at least a bit prejudiced against the other races due to past events such as the First Contact War and the krogan genophage. They all end up working together to save the universe from a common threat. One of those people you can recruit is [[spoiler:Morinth, Samara's sociopathic daughter, who intended to add Shepard to her long list of DeathBySex victims.]]
** The geth and the ''Reapers'' do this in ''[[VideoGame/MassEffect3 3]]''. Having declined an alliance with the "Old Machines" once before, the geth are forced to reconsider after the quarians try to wipe them out for the second time in three centuries. Faced with creators who seemingly refuse to treat them as equals and no help from any other organics, they decide that giving up their free will is preferable to being exterminated. It takes the combined efforts of Shepard, Legion, Tali and Zaal'Koris to get both species out of ''that'' mess intact.
** The entire ''Galaxy'' unites because of this in ''3''. Most of the various forces bitterly hate each other but can be convinced to fight side-by-side, including the Turians and Krogans, the Quarians and the Geth, the Humans and Batarians etc. The Rachni, once the bane of the Galaxy, also can become allied forces [[IOweYouMyLife due to their debt]] to Shepard.
** [[spoiler: In the ''Leviathan DLC'', Shepard manages to broker an alliance with the race the pre-dated the Reapers. However, the [[EldritchAbomination Leviathan]] make it very clear that the only reason they are helping is because they see the Reapers as having stolen the Galaxy from ''them'' and, since they consider themselves to be [[AGodAmI God-like]], are rather pissed off that the Reapers never paid proper "''tribute''" to them.]]
* This is the best way to describe the relationship between ''VideoGame/KaneAndLynch''. They consistently hate each other throughout the game since Lynch was originally a thug hired by TheSyndicate to watch Kane. HilarityEnsues as Lynch's AxCrazy nature gets the better of him...
* The Creator/CartoonNetwork MMO ''VideoGame/FusionFall'' has the heroes and enemies generally working together against [[BigBad Fuse]]. Mojo Jojo even provides the main fast-travel in the game. There are exceptions, though (a recent story arc has [[WesternAnimation/{{Ben 10}} Vilgax screwing things up for Ben]]).
* In ''VideoGame/{{Prototype}}'', [[ArmiesAreEvil Blackwatch]] works with Alex Mercer to defend the Bloodtox Pump from the Infected, and there are also side-events scattered around the city that involve fighting with the Marines or Blackwatch to beat the Infected. However, other than these few exceptions, Mercer and the Military are mortal enemies.
* Briefly in the first two ''VideoGame/{{Uncharted}}'' games.
** The original has [[spoiler: Nathan Drake and Eddy Raja versus the Spaniard zombie-thingies.]]
** Whereas in the sequel [[spoiler:the Guardians of Shambhala attack, and [[TheHero Nathan Drake]] is forced to work together with [[TheDragon Harry Flynn.]] ]]
* In ''{{Freespace}}'', the Terran-Vasudan War comes to an abrupt halt with the appearance of the Shivans, who are trying to kill both of them. Since the Shivans are more than capable of wiping out both species, the two agree to a cease-fire to deal with the common threat. The cease-fire holds and eventually becomes the foundation for an alliance between the two species.
** In the fan-made ''BluePlanet'' expansion, events transpire such that both the Terran forces of the GTVA and the UEF respond to a Vasudan ship in distress. The captains of both ships agree to set aside the war for the moment to rescue the Vasudans, and the deployed fighters make small talk with their opposite numbers. [[spoiler:It all falls apart when a second UEF ship arrives and, not knowing of the cease-fire, obliterates the GTVA ship. The UEF commanders were furious, since it made them look very, very bad in front of the Vasudans, with whom they had hoped to win political favor.]]
* In ''[[VideoGame/FirstEncounterAssaultRecon F.E.A.R. 3]]'', Paxton teams up with the ex-FEAR commando Point Man.
* Raikov's recruitment in ''VideoGame/MetalGearSolidPortableOps'' was mostly due to this trope, as he seemed to hate Gene enough to even ally himself with Naked Snake mostly to get revenge on Gene for humiliating him and locking him up (In case why it is worded this way, its because he has a lot of hate towards Naked Snake because [[spoiler: he was involved with the death of his lover, Colonel Volgin, in ''VideoGame/MetalGearSolid3SnakeEater''.]]) Roy Campbell even lampshades this by quoting the adage "The Enemy's Enemy is my Friend" during both the mission briefing and the radio call at the start of the mission.
* The whole point of the ''VideoGame/WarriorsOrochi'' games; all of the characters contained within are from either the Three Kingdoms period of China's history or the Warring States period of Japan's, and many of the characters are sworn enemies. However, a few of the Dream Mode stages in ''Warriors Orochi 2'' ''specifically'' invoke this trope by teaming up characters who normally hate each other, such as the stage where ''VideoGame/DynastyWarriors'' Guan Yu, Xiahou Dun, and Lu Meng team up to rescue Liu Chan from ''VideoGame/{{Samurai Warrior|s}}'' character Hideyoshi Toyotomi.
* In ''VideoGame/DragonAge'', [[spoiler: after punching some sense into Loghain's thick skull and overthrowing him from the throne, you can choose to spare him from execution and instead conscript him to the Wardens as a chance of redemption. He will then join your party and help you fight the Blight at the cost of Alistair, who will be so outraged with the decision of pardoning Loghain that he will leave.]]
** Also shows up in the myriad groups you are assigned to recruit; though nowhere so much as the Dalish working alongside humans.
** Even the ''Warden'' can be played like this with the Dalish and Dwarven backgrounds, not interested in ending the Blight so much for Ferelden's sake, but to prevent it from spreading and affecting ''their'' people.
--> '''Loghain''': Pray our King is admenable to reason.
--> '''Dalish Warden / Dwarf Warden''': The Dalish have ''no'' Kings! / He's not ''my'' King!
* Can happen in ''VideoGame/DragonAgeII'', depending on your choices and who you side with in the end. No matter how you feel about the mage/templar conflict, many people will probably side with the mages just to piss [[KnightTemplar Mere]][[ObviouslyEvil dith]] off. Also, this is Fenris' opinion on fighting alongside mages, particularly Merrill, with the implication that he won't straight-up gut them because of loyalty to Hawke.
** In the Mark of the Assassins DLC, Tallis is revealed to be working for the Qunari, who are feared by the rest of Ferelden. This quickly earns her the scorn of most party members since they're technically now working to save a group that most of them despises.
** Similarly, if you choose to side with the mages in the final confrontation and coerce Fenris/Aveline into joining you, or vice versa with the Templars and Merrill/Anders.
** Explicity stated to be the relationship between Mage!Hawke and Knight-Commander Meredith. She only lets Hawke continue to roam free because it's more useful to turn their magic against Kirkwall's enemies. That, and, she's utterly ''terrified'' of them!
* In ''[[VideoGame/{{Battlefield}} Battlefield 2: Modern Combat]]'', [[spoiler: when it is revealed that both NATO and China were misled into warring with each other by a third faction.]]
* ''VideoGame/SystemShock 2'' features the return of SHODAN, a rogue ArtificialIntelligence who was the BigBad of the original. The player joins SHODAN in a battle against a common enemy, The Many.
** When you enter [[spoiler: Polito's office]], SHODAN tells you that the reason she wants you to get rid of the Many is because they turned against her after the Hacker sabotaged her on Citadel Station. The Many grew up without her tutelage, and they decided that they hated the mechanical ways of SHODAN and wanted all of the universe to be covered in their organic ways.
* ''VideoGame/AdventureQuestWorlds'' has King Alteon and Gravelyn, Sepulchure's daughter, into forming a Great Truce between Good and Evil to deal with the threat of Drakath and his forces of Chaos, including the 13 Lords of Chaos.
* In the indie FPS ''Bet On Soldier'', you spend most of the game fighting through the Bet On Soldier tournament in order to confront the [=BOS=] [[WorldsStrongestMan World Champion]], Igor Boryenka, who you believe to be responsible for the murder of your wife. Once you finally defeat Boryenka, the real BigBad punishes you both by forcing the two of you to fight together in an Arena deathmatch against wave after wave of the best fighters in the [=BOS=] League. It's actually a pretty cool level, since Boryenka retains his boss-like health and damage output, but the sheer number and skill of opponents the two of you face make it seemingly impossible for him to survive to the end.
* In ''VideoGame/FalloutNewVegas'', if you take the [=NCR=], Mr. House or Independent path and complete sidequests pertaining to said factions, it's possible to have the [=NCR=], Brotherhood of Steel, Great Khans and [[spoiler: former Enclave soldiers]] fighting together against Caesar's Legion in the final battle for Hoover Dam. This is notable because most of those groups have been mortal enemies of the NCR throughout history, with [[spoiler: the Enclave]] having been the BigBad of the previous two games.
* Near the end of ''VideoGame/{{Crysis}} 2'', the remaining members of the [=CELL=] [=PMC=] that has spent the entire game trying to kill you end up teaming up with you against the Ceph alien invasion, because their dying boss makes it clear to them that their entire chain of command is now dead and you are now humanity's last hope for stopping the aliens.
* In ''VideoGame/{{Portal 2}}'', [[spoiler:GLaDOS, or rather, [[ItMakesSenseInContext GLaDOS inside of a potato]],]] joins up with main character Chell after GLaDOS is switched out of the main core, and pulls a HeelFaceTurn some time later.
-->'''GLaDOS''':[[spoiler:"Look, even if you think we're still enemies, we're enemies with a common interest. Revenge. You like revenge right? Everybody likes revenge. SO LET'S GO GET SOME!"]]
* In ''VideoGame/{{Xenonauts}}'' the US and USSR work together against the alien threat.
* A fandom example has unified the BrokenBase of the [[VideoGame/SpyroTheDragon Spyro fans.]] Both groups have come together to say NOTHING good can come from {{VideoGame/Skylanders|SpyrosAdventure}}.
* In the Sundown Kid's chapter in ''VideoGame/LiveALive'', Sundown Kid is being relentlessly pursued by the bounty hunter Mad Dog. They put their duel on hold when the town they stopped at is attacked by Odie's gang of outlaws. After working together to defeat Odie, Mad Dog will immediately try to settle things with Sundown once and for all, to the strong protests of the townspeople they just saved. Sundown can either finish off Mad Dog or spare him to fight another day.
* In the remake of ''VideoGame/TheTowerOfDruaga'' for the PCEngine, Gilgamesh, instead of killing the Succubus, must convince her to help him so he can get the Blue Crystal Rod and defeat Druaga.
* One mission in ''VideoGame/PerfectDark'' sees protagonist Joanna Dark, captured by Skedar in the mission beforehand, locked in the same cell as the head of the very organisation the game [[FromBadToWorse squares you up against]], Cassandra de Vries. [[spoiler:She willingly gives her life to allow Joanna to escape.]]
* In the ''[[VideoGame/TheElderScrollsVSkyrim Skyrim]]'' quest ''Cure For Madness'', you have to hunt down [[spoiler:Cicero]] after he apparently turns rogue and attacks [[spoiler:Astrid]]. However, you can choose to spare his life, and later he will act as a follower for you. Similarly you can play as an Imperial, High Elf, Dark Elf, etc whilst working for the Stormcloaks (who are known for the xenophobia of some members).
* ''VideoGame/{{Solatorobo}}'' has the [[PrivateMilitaryContractors Kurvasz]] [[AdventureGuild Hunters]], Howler {{Sky Pirate}}s, and a ''train conductor'' join forces to [[spoiler:procure a powerful bomb to help in the fight against Tartaros.]]
* ''VideoGame/NeverwinterNights2'' has an example that would not be allowed in a pen-and-paper game of ''TabletopGame/DungeonsAndDragons''. Namely, having [[ThePaladin Casavir]] and/or a paladin [[PlayerCharacter Knight-Captain]] work side-by-side with [[TokenEvilTeammate Bishop]] (ChaoticEvil ranger) and [[DealWithTheDevil Ammon Jerro]] (NeutralEvil warlock). Thankfully the "Code of Conduct" paladin class feature is not present in ''[=NWN2=]'', or else the game would be {{unwinnable|By Mistake}} since Jerro is the undisputed expert on the BigBad.
* The final chapter of ''VideoGame/BaldursGateDarkAlliance 2'' has The Hero, Jherek the Harper, and Kharne the Zhentarim mercenary team up against the vampire Mordoc Selanmere.
* Mid- to late-game players of recent games in the ''[[VideoGame/{{X}} X-Universe]]'' series can befriend the {{Yak|uza}}i faction by various means. They can then make use of their NGOSuperpower status to steal ships from "Return Ship" missions, by docking the ship at the shipyard in Senator's Badlands. The SpacePolice sent to destroy the stolen ship will spawn and immediately come under attack by the Yaki, [[CurbStompBattle who have an Akuma destroyer at their disposal]].
* In ''VideoGame/KidIcarusUprising'', immediately after a MeleeATrois between Pit, [[spoiler:Viridi's Forces of Nature]], and [[spoiler:Hades's Underworld forces]], the fight is put on hold to deal with [[spoiler:an alien invasion]] out of nowhere. Though [[spoiler:Hades]] still can't resist dropping a ChestMonster in Pit's path at every opportunity, [[spoiler:Viridi]] takes to the team-up very well, and remains a tenuous ally for the rest of the game.
* ''VideoGame/AlienVsPredatorCapcom'' has two Predators helping the humans hunt down Aliens on Earth.
* [[VideoGame/TeamFortress2 RED and BLU]] are joining forces against a robotic gray team in the [[http://www.teamfortress.com/mvm/ Mann vs. Machine]] update.
* The penultimate mission in ''NexusTheJupiterIncident'', in which you have to fight waves of entire fleets of enemies, has the possiblity of you getting reinforcements in the face of a [[LizardFolk Gorg]] warship captained by Chief Zatuk, the Gorg ruler. Slight subversion in that Zatuk never wanted to fight humans or the Vardrag, but the Gorg society is heavily clan-based, and it's several powerful clans who wish to fight.
