History EnemyMine / Videogames

* ''VideoGame/CallOfDuty: VideoGame/ModernWarfare 2'' has the appropriately named level "The Enemy of My Enemy":

* Happens quite often in the ''VideoGame/SlyCooper'' series:

** Zigzagged in ''VideoGame/SonicFrontiers''. [[spoiler:After Eggman finds himself trapped in {{cyberspace}}, his AI Sage suggests teaming up with Sonic to escape, but Eggman refuses, dismissing two of the aforementioned truces which Sage uses to make her case. When [[EldritchAbomination The End]], the game's BigBad, breaks loose and threatens to destroy all of existence, a still-reluctant Eggman agrees to ally with Sonic at Sage's plea. Sage herself acts as Sonic's partner for the rest of the game thereafter.]]

** Halfway through ''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. By the end, they're staunch allies and the decades-long feud between old Rubinelle and Lazuria is finally over.

** A brief one occurs toward the end of ''VideoGame/MetalGearSolid2SonsOfLiberty'', when [[spoiler:[[MagnificentBastard Revolver Ocelot]] is unsurprisingly revealed to have been playing everyone all along as the winner of a GambitPileup. Initially it was Snake and Raiden versus Solidus, Fortune, and Ocelot, then Solidus was revealed to have [[BadBoss betrayed Fortune]], making them enemies as well, until Ocelot revealed that he had betrayed them both anyway and immediately tried to [[KillEmAll destroy them all with Metal Gear Ray’s missiles.]] Despite the three-way conflict going on among all of them, they ultimately all needed to survive Ocelot’s onslaught, so Fortune [[DyingMomentOfAwesome uses the last of her power to divert Ocelot’s missiles and save the lives of the three enemies standing beside her]].]]

* Halfway through ''[[VideoGame/NintendoWars Advance Wars: Days of Ruin]]'' (after [[spoiler:Captain Brenner is killed]]), Tasha, Gage, and the surviving Lazurians [[strike: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/AlienVsPredatorCapcom'' has two Predators helping the humans hunt down Aliens on Earth.

* In ''{{VideoGame/Battlezone|1998}}'', 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/FalloutNewVegas'', if you take the NCR, Mr. House, or Independent path and complete sidequests pertaining to said factions, it's possible to have the New California Republic, Brotherhood of Steel, Great Khans, and [[spoiler:Enclave Remnants]] fighting together against [[TheEmpire Caesar's Legion]] in the final battle for Hoover Dam. All of these groups have been mortal enemies of the NCR throughout history, with [[spoiler:the Enclave]] having been the main villains of the previous two games, the Brotherhood of Steel being at war with the NCR back west, and the Khans having tried to destroy Shady Sands (the Republic's founding settlement) ''twice'' (once prior to NCR's founding, once after). On top of this two of the factions are ''themselves'' old enemies — [[spoiler:the Brotherhood fought the Enclave in the aftermath of ''VideoGame/Fallout2 and'' on the East Coast in ''VideoGame/Fallout3'']].

* The third act of ''VideoGame/{{Geneforge}} 4'' features the Shapers and Rebels putting a temporary stop on the war with eachother to deal with Monarch, a crazed canister junkie trying to seize control of the Fens of Aziraph.

** The immediate post-war state of the human/Elite alliance is explored in the ending of ''VideoGame/Halo3'' and a number of works set right afterwards. [[spoiler:Admiral Hood tells the Arbiter that he can never forgive the Elites for what they did as part of the Covenant, but thanks him for standing by the Chief to the end.]] They're not really enemies anymore, but their alliance at this point is still tenuous and not very "buddy-buddy" at all.

** ''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.]]

** 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 you wonder why it is worded this way, it's 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.

-->'''Pavel''': So...um... you're with the Spartan Order? I'm from the Red Line. Our superiors are not on the best of terms, eh? But I say fuck that- uh, fuck that! The grunts stick together, uh?
-->'''Artyom''': My escape from the Nazi prison could be entitled "The enemy of my Enemy is my friend"... I never liked communists much, but Pavel acted like a real hero.

* 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.]]

* ''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 eventually 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.]]

* Late in ''VideoGame/Persona5'', the Phantom Thieves of Heart are forced to team up with their arch-nemesis, the detective Goro Akechi, in order to take down the true culprit behind the mental shutdown cases. [[spoiler:It turns out that Akechi was planning to backstab them the entire time, and the Thieves were planning to con him in turn. Played more straight in ''[[UpdatedReRelease Royal]]'' where Akechi joins forces with them once more against Maruki and this time he doesn't backstab them although they are still weary of him]]

** 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.]]

-->'''[=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. Well, LET'S GO GET SOME!"]]

* Downplayed in ''VideoGame/ReturnOfTheObraDinn'': [[spoiler:Although Nathan Peters would never forgive Lars Linde for killing his brother Samuel (though Samuel's death was a freak cargo accident) both foes would work together to stop the Crab Riders from rescuing the mermaids from the lazarette. Even then, it still didn't stop Nathan from killing Linde later as he was escaping with Alexander Booth and Duncan [=McKay=]... [[LaserGuidedKarma in a kraken attack that would later destroy them]].]]

** Although Arielle is understandably cross with the party for kidnapping her, she has no choice but to fight alongside them in order to to survive in Cirinthia's sewer dungeon. She becomes comitted to their cause after realizing that they're telling the truth about Arkadya.
** Lilly, Heavy Slim, and Ratface Jim despite Rowan for his transgressions agaisnt Selene, but during the infiltration of Udingrad, they work with the party because they despise Arkadya more, [[spoiler:as it was an Arkadyan assassin who killed Selene. They team up with the party again in order to oppose Phillip, who is responsible for purging their Cirinthia base.]]

** After spending the final mission of Issue #10 in battle with the [[MouthOfSauron Black Signal]], players end up becoming his partners-in-crime after he realizes that you're after [[spoiler: [[HumanoidAbomination Lilith]] ]]; wanting her dead as much as the Big Three by this point, he decides to help open the way so you can eliminate his hated enemy. [[spoiler: The alliance falls to bits when you decide to hear Lilith out instead, resulting in the Black Signal assaulting the two of you with all the bodies under his control.]]

** In ''VideoGame/SonicForces'', Chaos, Shadow, and Zavok re-join Eggman's bid of conquest. [[spoiler: [[YourMindMakesItReal Except it's not really them.]]]]

** In ''VideoGame/StarCraftIIWingsOfLiberty'', [[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.]]
** In ''VideoGame/StarCraftIILegacyOfTheVoid'', [[spoiler: during the Epilogue Campaign, all the three playable races join forces to take down [[GreaterScopeVillain Amon]], deep within the Void.]]
* 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.

** One occurs in the Sith Warrior storyline when you meet a Mirialan Jedi Master named Somminick Timmns on your quest to defeat Darth Ekkage. You find him trapped in a room with computers containing information you need, and you're forced to work together in order to open the door. After doing so you see that he's destroyed them so you need him alive (for the time being) and the two of you begrudgingly join forces in order to defeat Ekkage. Once your shared goal is accomplished, you can part as enemies, acknowledge him as a friend, or attack him.
** Near the end of the Smuggler storyline, [[spoiler:you learn your allies were actually using you as a pawn of the Empire. You’re about to confront Rogun, the crime lord who’s put a massive bounty on your head, but when the two of you learn this, he offers you his help taking said “allies” down.]]

** In ''VideoGame/SuperPaperMario'', Bowser teams up with Mario and Peach ONLY after he [[DelayedOhCrap realizes that, if the world is destroyed, there won't be anything left for him to take over]]. Sometimes, it just takes a good friend... or enemy... explaining something to you...
** 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, after the new villain tells him WeCanRuleTogether. [[spoiler:Turns out Bowser was exploiting Antasma's extra help the whole time; he later throws Antasma under the bus to be dispatched by the Mario Bros. while he takes the Dream Stone for himself.]]
** In ''[[VideoGame/DrMario Dr. Mario World]],'' the game starts with the Toads and Bowser’s minions being affected by viruses. In the cutscene that follows the 10th level, Bowser is horrified on what the viruses are doing to his minions, and as such, Mario, Peach and Bowser once again join forces to put an end to the virus infection, with Bowser becoming Dr. Bowser.

** In ''VideoGame/SuperSmashBrosUltimate'', all fighters have to team up in order to defeat [[spoiler: Galeem and Dharkon]]. This goes further, since you also have all the spirits you free, so you can have things like Mega Man fighting with Dr. Wily's spirit, Ryu fighting alongside M. Bison or any incarnation of Link and Zelda fighting with the assistance of Calamity Ganon. In the GoldenEnding [[spoiler: both Galeem and Dharkon join forces to fight you, but in their case it becomes TeethClenchedTeamwork, as their warriors are more likely to attack each other than attack you and when either of them is incapacitated, the other one will proceed to take a powerful hit against it]].

** [[spoiler:Kratos after his betrayal, when you invade Forcystus' human ranch]]

** ''[[VideoGame/UnchartedDrakesFortune Drake's Fortune]]'' has [[spoiler:Nathan Drake and Eddy Raja versus the Spaniard zombie-thingies.]]
** Whereas in ''[[VideoGame/Uncharted2AmongThieves Among Thieves]]'', [[spoiler:the Guardians of Shambhala attack, and [[TheHero Nathan Drake]] is forced to work together with [[TheDragon Harry Flynn.]]]]

** ''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 millennia-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]]. [[spoiler:When Garrosh released the heart of Y'Shaarj, the Klaxxi [[NeutralNoLonger allied with him in order to serve their god]]]].

* ''VideoGame/WildArms1'' has your party reach the Photosphere where they are guided through by a mysterious man in a blue robe. He warns them that he is not their ally but as long as they have a common foe, there is no reason for them to fight. [[spoiler: After Mother is defeated, he reveals himself to be Zeikfried, the ruthless leader of the Quarter Knights set on [[TakeOverTheWorld conquering the world.]]]]
** ''VideoGame/WildArmsMillionMemories'' re-uses the trope [[spoiler: Only this time Siegfried doesn't even bother with the robe and ends up [[TakingTheBullet Taking the Bullet]] and [[HeroicSscrifice sacrificing himself]] to keep Rudy alive, knowing he's the best chance Filgaia has against Mother.]]

* The ''Videogame/{{Diablo}}'' series:
** Necromancers in ''Videogame/DiabloII'' believe in the BalanceBetweenGoodAndEvil, and are every bit as distrustful towards angels as they are towards demons. However, so long as demons hold the upper hand in the Eternal Conflict, they are content to work alongside the angels until they perceive the balance as being restored.
** In Act III of ''Videogame/DiabloIII'', your hero must assist in the defence of Bastion's Keep after it is besieged by the Demon Azmodan. If you play as a Barbarian, the quest journal will note that the Keep was first built as a means to wage war on the barbarians, but the Barbarian recognises they must fight alongside its defenders regardless.

* In ''Videogame/DragonBallXenoverse'', villains such as Frieza, Cell, or Ginyu will show up in the hub city and become available as trainers on the basis that even they don't want the villains to destroy all of history.

* 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]]).

* ''Franchise/{{Halo}}'' does this ''twice''. First, at the end of ''VideoGame/{{Halo 2}}'', the humans of the UNSC and the Covenant Elites, who were previously mortal enemies, join forces to fight the Prophet of Truth, who betrayed the latter and was responsible for ordering the extermination of the former. In ''VideoGame/{{Halo 3}}'', right before confronting Truth himself, the Master Chief and the Arbiter join forces with [[spoiler:the Flood]] to stop Truth from killing ''everyone'' in the galaxy.

** The immediate post-war state of the human/Elite alliance is explored in the ending of ''VideoGame/{{Halo 3}}'' and a number of works set right afterwards. [[spoiler:Admiral Hood tells the Arbiter that he can never forgive the Elites for what they did as part of the Covenant, but thanks him for standing by the Chief to the end.]] They're not really enemies anymore, but their alliance at this point is still tenuous and not very "buddy-buddy" at all.

* This happens at a few points in ''VideoGame/{{Infamous 2}}'': about midway through the game, a giant monster [[spoiler:(who is really Bertrand, the leader of the Conduit-hating Militia, having gone OneWingedAngel)]] attacks New Marais, and the Militia stop attacking Cole to focus on the monster. Some Good Karma sidequests also have Cole working alongside a defector from Vermakk 88. [[spoiler:In the endgame, if Cole decides to side with the Beast, the Militia and their rivals, the Rebels, will put aside their differences to stop Cole and the Beast.]]
* In the story mode of ''VideoGame/Injustice2'', Franchise/{{Batman}} and his allies have to join forces with {{Superman}} and his Regime remnants to take down the invading ComicBook/{{Brainiac}}. Once Brainiac is taken care of, however, they immediately go back to fighting each other over whether they should kill him or not.
* In ''VideoGame/KaiserreichLegacyOfTheWeltkrieg'', an AlternateHistory VideoGame/HeartsOfIron mod with the point of divergence being a German empire victorious in the Second Battle of Jutland (and consequently World War I):

* ''Franchise/MetalGear'':

* Early on in ''Videogame/MetroLastLight'', Artyom is captured by [[ThoseWackyNazis the Reich]] and sent to a prison facility, where he ends up working with Pavel, an imprisoned soldier of the [[DirtyCommunist Red Line]], to engineer an escape. Pavel and Artyom both lampshade this:

* 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.

* 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 ComicBook/{{Venom}}'s symbiote army... if only because ReedRichardsIsUseless by being absent when he tried to phone him, [[Comicbook/IronMan Tony Stark]] and [[Comicbook/XMen 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]].

** 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.
** In ''[[VideoGame/SuperPaperMario Super Paper Mario]]'', Bowser teams up with Mario and Peach ONLY after he [[DelayedOhCrap realizes that, if the world is destroyed, there won't be anything left for him to take over]]. Sometimes, it just takes a good friend... or enemy... explaining something to you...

** PlayedForLaughs while playing the "Great Bay" stage in ''Melee'' western players have been known to call a brief truce just so they can [[AmericansHateTingle drop Tingle into the ocean.]]

* ''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.

* In ''VideoGame/TalesOfSymphonia'', Lloyd's group joins up with Sheena, their [[HitmanwithaHeart enemy]], in order to save a village from [[NebulousEvilOrganisation the]] [[ANaziByAnyOtherName Desians]].

* In ''VideoGame/ThiefTheDarkProject'', 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 ''VideoGame/ThiefIITheMetalAge'', [[spoiler:the main character teams up with the survivors of the Pagans against a Hammerite splinter group]]. In ''VideoGame/ThiefDeadlyShadows'', 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.]]

* 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 ''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/HalfLife'' — HECU and Black Ops are both there to kill Freeman and fight against each other.

** During the 1st Era war against the [[KnightTemplar Alessian]] [[TheOrder Order]], the Colovian King Rislav formed an alliance between himself, the Direnni Hegemony (an [[WitchSpecies Altmeri (High Elven)]] nation which ruled about 1/3 of Tamriel's landmass out of High Rock, and the [[HornyVikings Nordic Empire]] led by [[TheHighKing High King]] Hoag Merkiller (a nickname) of Skyrim. So hated was the Alessian Order that a bastion of Merrish might bordering Skyrim willingly allied with a king so famous for killing Mer that it became ''part of his name''.

* Bass, an advanced robot made by Dr. Wily in the classic ''VideoGame/{{Mega Man|Classic}}'' series, serves as villain and rival for Mega Man in the [[VideoGame/MegaMan7 seventh]] and [[VideoGame/MegaMan8 eighth]] games. But in ''VideoGame/MegaManAndBass'' ({{Fan Nickname}}d as ''Mega Man 8.5'' and ''VideoGame/MegaMan9'' years before the official release), Bass has to TagTeam Mega Man to fight a common enemy: the rebel robot known as "King". Bass also [[TurnedAgainstTheirMasters goes against Wily]] in the ''Power'' series (''[[VideoGame/MegaManThePowerBattle Battle]]'' and ''[[VideoGame/MegaMan2ThePowerFighters Fighters]]'') as well as in ''VideoGame/MegaMan10'' (as {{DLC}}.)

** ''VideoGame/WildArmsMillionMemories'' re-uses the trope [[spoiler: Only this time Siegfried doesn't even bother with the robe and ends up [[TakingTheBullet Taking the Bullet and [[HeroicSscrifice sacrificing himself]] to keep Rudy alive, knowing he's the best chance Filgaia has against Mother.]]

* ''VideoGame/{{Shantae}} and the Pirate's Curse'' has Shantae and her ArchEnemy Risky Boots teaming up so they could defeat the Pirate Master. In Shantae's case, it's because she has ChronicHeroSyndrome. In Risky's case, it's because [[ItsPersonal she really hates the Pirate Master]].

* ''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/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.]]

* ''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.

** Could happen in ''VideoGame/BaldursGateII'', if you are a righteous character as a paladin, and still ally with the Shadow Thieves (a guild of thieves, murderers and gangsters that normally a character like yours would strive to shut down) in order to [[spoiler:defeat Bodhi and her vampire guild. Twice.]]

* 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.]]

* In ''VideoGame/Bayonetta2'', [[spoiler:there's a ''villainous'' example! The Jetfighter Assault level has angels and demons cooperating to gang up on the heroine and Balder to stop them from reaching Fimbulventr.]]

* In ''[[VideoGame/{{Blinx}} Blinx 2]]'', [[spoiler: after the Tom Toms realize stealing the Big Crystal is going to destroy time itself, your Time Sweeper team and your Tom Tom team work together to fight the [[FinalBoss Scissor Demon]].]]
* At the end of ''VideoGame/{{Bomberman}} 64'', halfway through the final battle against [[spoiler:Sirius]] -- the scumbag 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.
* ''Videogame/BreathOfFireIV'' finds Ursula and Scias teaming up with your party, despite being (separately) employed by different enemies of yours (Ursula is from the Fou Empire; Scias was employed by Ludia, whose relations with the heroes are... shaky at best).

*** 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.

** Happens again in ''VideoGame/CrashBandicoot4ItsAboutTime'' where Cortex is forced to team up with Crash to defeat [[spoiler: Dr. Nefarious Tropy after he [[TheMutiny betrays him]] with the goal of recreating the timeline in his own image. However, after he's defeated, [[FalselyReformedVillain it isn't long before he's back to his evil ways.]]]]

** In ''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 at 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.]]

* In ''Videogame/DragonAgeInquisition'', [[spoiler: provided they perform a series of religious rites to prove their sincerity, during the battle for the Temple of Mythal, Abelas, commander of the Sentinels who defend the temple, offers the Inquisitor and their party an alliance against the Red Templars/Venatori storming the Temple, since performing those rites proves they're not out to loot the knowledge the BigBad wants to cause TheEndOfTheWorldAsWeKnowIt that the temple protects. It's up to the Inquistor whether or not to accept]].

** ''VideoGame/DragonQuestII'': A minor example. In the castle of the Dragonlord -''VideoGame/DragonQuestI'''s BigBad-, you'll find his descendant, who gives you a hint toward defeating Hargon rather than fighting you.
** ''VideoGame/DragonQuestHeroesRocketSlime'': Slival joins up with you at the end of the game to confront Don Clawleone who's possessed by Flucifier, knowing that it's better to put a rivalry on hold to save the world.

** On the continent of [[{{Wutai}} Akavir]], the "monkey folk" Tang Mo have been attacked by all of their neighboring enemies at one time or another. Recently (relative to when ''[[InGameNovel Mysterious Akavir]]'' was written at least), they've allied with one of those nations -- the "[[CatFolk tiger folk]]" of Ka Po' Tun.
** Another Akaviri race, the Kamal "[[EvilIsDeathlyCold Snow Demons]]", invaded Tamriel during the 2nd Era. Their initial successes forced three ancient enemies -- the [[HornyVikings Nords]], [[OurElvesAreDifferent Dunmer (Dark Elves)]], and [[LizardFolk Argonians]] -- to form an alliance to defeat them. The end result was a massive CurbStompBattle which saw the Kamal invaders die by the thousands.

* In ''VideoGame/FairyFencerF: Advent Dark Force'', the [[spoiler:Evil Goddess timeline, the Septerion Club is imprisoning or executing former Dorfa employees. Fang feels the new order that Sherman has created is twisted and evil and immediately travels to the HellholePrison that is the Justice Society Camp to liberate imprison Dorfa members and try to [[InvokedTrope invoke this]]. It fails with Hanagata and Paiga, but works with Marianna, who initially joins only for this reason but later genuinely warms to the party.]]
* 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 New California Republic, Brotherhood of Steel, Great Khans, and [[spoiler:Enclave Remnants]] fighting together against [[TheEmpire Caesar's Legion]] in the final battle for Hoover Dam. All of these groups have been mortal enemies of the NCR throughout history, with [[spoiler:the Enclave]] having been the main villains of the previous two games, the Brotherhood of Steel being at war with the NCR back west, and the Khans having tried to destroy Shady Sands (the Republic's founding settlement) ''twice'' (once prior to NCR's founding, once after). On top of this two of the factions are ''themselves'' old enemies -- [[spoiler:the Brotherhood fought the Enclave in the aftermath of ''VideoGame/Fallout2 and'' on the East Coast in ''VideoGame/Fallout3'']].

** The ''Revelation'' route in ''VideoGame/FireEmblemFates'' pretty much has this trope as its focus. The kingdoms of Hoshido and Nohr are bitter arch-enemies at war. However, the player character, who decided to stay neutral, will gradually recruit members of both the Hoshidan and Nohrian army, until they have the entire army of both kingdoms under their command to crash against the real threat: [[spoiler:the kingdom of Valla, whose king masterminded the entire war.]]

* ''VideoGame/HalfLife'' -- HECU and Black Ops are both there to kill Freeman and fight against each other.

* In the story mode of ''VideoGame/Injustice2'', Franchise/{{Batman}} and his allies have to join forces with {{Superman}} and his Regime remnants to take down the invading ComicBook/{{Brainiac}}. Once Brainiac is taken care of however, they immediately go back to fighting each other over whether they should kill him or not.

* 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...

** Later, [[spoiler:Medusa appears during the final battle to sock Hades in the face before he can finish Pit off, having been revived by the lord of the underworld, but pledging that she would no longer be his puppet. She's killed for her trouble, but it gives Pit, Viridi, and Palutena the opportunity they need to finish Hades.]]

** 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 [[RedshirtArmy Dusks]] with a DangerousForbiddenTechnique, then uses the last of his power]] to open the gate to [[SupervillainLair The World That Never Was.]]

** [[spoiler:Sharon is Legion IX of Ouroboros. She teams up with the faculty to fight off the Panzersoldats sent by the Noble Faction, even though her organization is behind the Nobles and their ultimate goals coincide right now... because even if she is a Legion, she's also Alisa's [[{{Meido}} maid]] and wants to keep her safe. Whether this cooperation will last once all the stops are pulled out on the Phantasmal Blaze plan is another matter...]]
** In ''Cold Steel II'', the party learns that [[spoiler:the Noble Alliance teamed up with the Calvard Republic to take over the watchtower in the Nord Highlands, even though Erebonia and the Republic are notorious for being mortal enemies.]]

** Tali also hates Cerberus with a passion and [[UndyingLoyalty she only joins the mission to help Shepard.]]