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* In ''Fanfic/TransformersMHA'', Swindle and Skullcruncher team up with MECH so that Silas can trap and dissect the Autobots in exchange for getting revenge on the UA students and the Autobots for stranding them on Earth and destroying all of their produce.
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** Upon learning that the Collector's mirror has resurfaced, Demona and Macbeth reluctantly agree to team up in order to free him, in exchange for him breaking the bond between the two of them.
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** Upon learning that the Collector's mirror has resurfaced, Demona and Macbeth reluctantly agree to team up in order to free him, in exchange for him breaking the bond between the two of them. Later, they recruit [[spoiler: Madame Mim]] to help them as well, since as the Masters' adoptive mother, she'd want him free just for its own sake.
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* ''Fanfic/InvaderZimABadThingNeverEnds'': After being introduced in Chapter 8, Lex seeks out Tak for an alliance against Zim -- Tak already despises Zim and wants to steal his mission, and Lex is now at odds with Zim due to his own mission requiring [[spoiler: stealing Minimoose]], so it's mutually beneficial for them to work together against him. [[spoiler: This alliance ends up breaking apart in Chapter 18 when Lex's condescension towards Tak's obsessive rivalry with Zim causes her to finally snap and turn on him. Afterwards, Zim offers Tak an EnemyMine alliance against Lex, while Lex approaches Aldrich for an alliance against Zim.]]
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* ''Fanfic/InvaderZimABadThingNeverEnds'': After being introduced in Chapter 8, Lex seeks out Tak for an alliance against Zim -- Tak already despises Zim and wants to steal his mission, and Lex is now at odds with Zim due to his own mission requiring [[spoiler: stealing Minimoose]], so it's mutually beneficial for them to work together against him. [[spoiler: This alliance ends up breaking apart in Chapter 18 when Lex's condescension towards Tak's obsessive rivalry with Zim causes her to finally snap and turn on him. Afterwards, Zim offers Tak an EnemyMine alliance against Lex, while Lex approaches [[CorruptCorporateExecutive Aldrich Coathanger]] for an alliance against Zim.Zim (whom Aldrich has had his own clashes with throughout the story).]]
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* ''Fanfic/InvaderZimABadThingNeverEnds'': After being introduced in Chapter 8, Lex seeks out Tak for an alliance against Zim -- Tak already despises Zim and wants to steal his mission, and Lex is now at odds with Zim due to his own mission requiring [[spoiler: stealing Minimoose]], so it's mutually beneficial for them to work together against him.
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* ''Fanfic/InvaderZimABadThingNeverEnds'': After being introduced in Chapter 8, Lex seeks out Tak for an alliance against Zim -- Tak already despises Zim and wants to steal his mission, and Lex is now at odds with Zim due to his own mission requiring [[spoiler: stealing Minimoose]], so it's mutually beneficial for them to work together against him. [[spoiler: This alliance ends up breaking apart in Chapter 18 when Lex's condescension towards Tak's obsessive rivalry with Zim causes her to finally snap and turn on him. Afterwards, Zim offers Tak an EnemyMine alliance against Lex, while Lex approaches Aldrich for an alliance against Zim.]]
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* ''Fanfic/IgnitedSpark'' The Villain Consortium (run by Nine) is comprised of many villain groups such as the Shie Hissaski, The Wild Villains, the Volcano Thieves and elements of the Meta Liberation Army.
* ''Fanfic/MyHeroAcademiaUnchainedPredator'': Curator and the Volcano Thieves are part of the League of Villains (the former having been busted out by All for One, the latter group probably joining after [[PersonOfMassDestruction Volcano destroyed Eusha City]]), with Bearhead and Zookeeper's positions being largely unspecified. Unfortunately for them, they are now on the Slayer's radar, and unlike the heroes who would rather bring them to justice, the Slayer wants their heads on a pike.
* ''Fanfic/MyHeroAcademiaUnchainedPredator'': Curator and the Volcano Thieves are part of the League of Villains (the former having been busted out by All for One, the latter group probably joining after [[PersonOfMassDestruction Volcano destroyed Eusha City]]), with Bearhead and Zookeeper's positions being largely unspecified. Unfortunately for them, they are now on the Slayer's radar, and unlike the heroes who would rather bring them to justice, the Slayer wants their heads on a pike.
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**Upon learning that the Collector's mirror has resurfaced, Demona and Macbeth reluctantly agree to team up in order to free him, in exchange for him breaking the bond between the two of them.
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* ''[[Fanfic/StarWarsVsWarhammer40K Star Wars vs Warhammer 40K]]'':
** Roughly around the midway point of Season 2, Jabba the Hutt and his criminal empire are forcibly enlisted by [[spoiler:Commissar Ciaphas Cain]] to aid the Imperium of Man's colonization efforts on Tatooine.
** Episodes 32–33 have a subplot featuring a team-up between Boba Fett and the Space Wolves as they come [[EvilVersusEvil into conflict]] with Tusken Raiders attempting to hijack one of Jabba's spice trains.
** The end credits of the Season 4 premiere show a series of {{Wham Shot}}s revealing that [[spoiler:Tzeentch and Slaanesh are somehow involved in the story's events and have been working together the whole time behind the scenes.]]
** Roughly around the midway point of Season 2, Jabba the Hutt and his criminal empire are forcibly enlisted by [[spoiler:Commissar Ciaphas Cain]] to aid the Imperium of Man's colonization efforts on Tatooine.
** Episodes 32–33 have a subplot featuring a team-up between Boba Fett and the Space Wolves as they come [[EvilVersusEvil into conflict]] with Tusken Raiders attempting to hijack one of Jabba's spice trains.
** The end credits of the Season 4 premiere show a series of {{Wham Shot}}s revealing that [[spoiler:Tzeentch and Slaanesh are somehow involved in the story's events and have been working together the whole time behind the scenes.]]
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* ''Fanfic/TheChaoticMasters'': Upon sensing the Chaotic Masters' return, Monkey Fist reluctantly teams up with Drakken to escape prison and go after the Miraculous, intending to use them to earn his way into Monkey King's service and study under him as his disciple.
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* ''Fanfic/TheChaoticMasters'': Upon ''Fanfic/TheChaoticMasters'':
**Upon sensing the Chaotic Masters' return, Monkey Fist reluctantly teams up with Drakken to escape prison and go after the Miraculous, intending to use them to earn his way into Monkey King's service and study under him as hisdisciple.disciple.
**Since an open conflict between them would catch the attention of all the heroes, which neither side wants, [[spoiler:Tirek]] and the Dazzlings instead cut a deal — they'll find the magic gems he needs to restore himself to full power, and in exchange he'll give them everything they need to free [[UnholyMatrimony their husbands]].
**Upon sensing the Chaotic Masters' return, Monkey Fist reluctantly teams up with Drakken to escape prison and go after the Miraculous, intending to use them to earn his way into Monkey King's service and study under him as his
**Since an open conflict between them would catch the attention of all the heroes, which neither side wants, [[spoiler:Tirek]] and the Dazzlings instead cut a deal — they'll find the magic gems he needs to restore himself to full power, and in exchange he'll give them everything they need to free [[UnholyMatrimony their husbands]].
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* ''Fanfic/TheChaoticMasters'': Upon sensing the Chaotic Masters' return, Monkey Fist reluctantly teams up with Drakken to escape prison and go after the Miraculous, intending to use them to earn his way into Monkey King's service and study under him as his disciple.
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dewicking For Want Of A Nail
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* ''Fanfic/{{Empathy}}'': One of the ForWantOfANail-inspired differences in this universe is that [[WesternAnimation/BigHero6 Yokai]] is eventually revealed to be in a team-up with [[spoiler: [[WesternAnimation/Home2015 Captain Smek]]]].
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* ''Fanfic/{{Empathy}}'': One of the ForWantOfANail-inspired {{Crossover}}-inspired differences in this universe is that [[WesternAnimation/BigHero6 Yokai]] is eventually revealed to be in a team-up with [[spoiler: [[WesternAnimation/Home2015 Captain Smek]]]].
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* ''Fanfic/InvaderZimABadThingNeverEnds'': After being introduced in Chapter 8, Lex seeks out Tak for an alliance against Zim -- Tak already despises Zim and wants to steal his mission, and Lex is now at odds with Zim due to his own mission requiring [[spoiler: stealing Minimoose]], so it's mutually beneficial for them to work together against him.
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** After being hinted at throughout Season 1, the end of ''Dawn of the Dragons'' confirms that the Avengers' respective [[ArchEnemy archenemies]] have formed an [[BigBadDuumvirate alliance]] called the Cabal. [[spoiler: ''Clash of Titans'' then expands on this by revealing they've managed to also recruited all of their respective [[RoguesGallery Rogues Galleries]] to act as an army under their command.
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** After being hinted at throughout Season 1, the end of ''Dawn of the Dragons'' confirms that the Avengers' respective [[ArchEnemy archenemies]] have formed an [[BigBadDuumvirate alliance]] called the Cabal. [[spoiler: ''Clash of Titans'' then expands on this by revealing they've managed to also recruited all of their respective [[RoguesGallery Rogues Galleries]] to act as an army under their command.]]
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* ''Fanfic/AvengersOfTheMultiverse'':
** After being hinted at throughout Season 1, the end of ''Dawn of the Dragons'' confirms that the Avengers' respective [[ArchEnemy archenemies]] have formed an [[BigBadDuumvirate alliance]] called the Cabal. [[spoiler: ''Clash of Titans'' then expands on this by revealing they've managed to also recruited all of their respective [[RoguesGallery Rogues Galleries]] to act as an army under their command.
** ''Forces of Nature'' features a team-up between Vortex and Undergrowth, who both refused to join the Cabal because of their shared [[FantasticRacism hatred of humanity]].
** After being hinted at throughout Season 1, the end of ''Dawn of the Dragons'' confirms that the Avengers' respective [[ArchEnemy archenemies]] have formed an [[BigBadDuumvirate alliance]] called the Cabal. [[spoiler: ''Clash of Titans'' then expands on this by revealing they've managed to also recruited all of their respective [[RoguesGallery Rogues Galleries]] to act as an army under their command.
** ''Forces of Nature'' features a team-up between Vortex and Undergrowth, who both refused to join the Cabal because of their shared [[FantasticRacism hatred of humanity]].
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** The Knights of Vengeance, as per canon, are an alliance of antagonists that the J-WITCH team have fought before and are now working together under Nerissa's guidance, with Drago and Hak Foo also being members.
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** The Knights of Vengeance, as per canon, are an alliance of antagonists that the J-WITCH team have fought before and are now working together under Nerissa's guidance, with Drago and Hak Foo also being members. The Ice Crew later join them as well.
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* ''Fanfic/DarthVaderHeroOfNaboo'': During the first epilogue, Vader and Plagueis come to a working arrangement, wherein Vader will give Plagueis the locations of lost Sith artifacts he and Sidious found in Vader's old timeline, in exchange for Plagueis providing him with the resources needed to [[spoiler: keep the time-displaced Death Squadron maintained and hidden]] until such time as Vader is ready to make his move.
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* ''Fanfic/InkopolisChaos'': In the third story, Lieutenant Obsidian and Scarlet Spiker team up, though it is a sharky alliance and Scarlet plans to betray Obsidian, and Obsidian plans to throw Scarlet in a camp once she is done with her.
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** The Knights of Vengeance, as per canon, are an alliance of antagonists that the J-WITCH team have fought before and are now working together under Nerissa's guidance, with Drago and Hak Foo also being members.
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* ''Fanfic/JWITCHSeason1'':
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* ''Fanfic/JWITCHSeason1'':The ''Fanfic/JWITCHSeries'':
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** The [[VideoGame/FinalFantasyVII Shinra Electric Power Company]], the [[Franchise/TeenageMutantNinjaTurtles Foot Clan]], and the [[WesternAnimation/InvasionAmerica Tyrusians]] are working together to take over Gaea. Each faction is planning to double-cross the others [[YouHaveOutlivedYourUsefulness once they're no longer needed]], and is aware that the others are planning to do the same, but are willing to work together until then out of necessity.
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* ''Fanfic/ACrewForAKing'': When the Baroque Works agents arrive on Drum Island looking for the Straw Hats, they encounter Wapol, and quickly strike a deal where they'll help him reclaim his castle in exchange for his help capturing Vivi.
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* ''Fanfic/ThereWasOnceAnAvengerFromKrypton'': Chapter 32 of ''The Girl Who Could Knock Out the Hulk'' reveals that [[spoiler: Hercules and Hekate]] are working with Doctor Doom, the former as a means of revenge against the Olympians and the latter to learn more about how Doom got his vast magical powers (which are outside the norm for human mages).
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* ''Fanfic/ThereWasOnceAnAvengerFromKrypton'': ''Fanfic/ThereWasOnceAnAvengerFromKrypton'':
** Chapter 32 of ''The Girl Who Could Knock Out the Hulk'' reveals that [[spoiler: Hercules andHekate]] Hecate]] are working with Doctor Doom, the former as [[RageAgainstTheHeavens a means of revenge against the Olympians Olympians]] and the latter to learn more about how Doom got his vast magical powers (which are outside the norm for human mages).mages); this is later clarified in Chapter 35 to have only been the initial motivation, and now she's aiding him in return for [[spoiler: [[{{Retconjuration}} creating a timeline]] where none of her children die in the Titan and Giant wars]].
** Doom is also working with the Faceless, a cult of Egyptian magicians who want to "free" humanity by wiping out the gods, regardless of the resulting damage to reality.
** Chapter 32 of ''The Girl Who Could Knock Out the Hulk'' reveals that [[spoiler: Hercules and
** Doom is also working with the Faceless, a cult of Egyptian magicians who want to "free" humanity by wiping out the gods, regardless of the resulting damage to reality.
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* ''Fanfic/{{Empathy}}'': One of the ForWantOfANail-inspired differences in this universe is that [[WesternAnimation/BigHero6 Yokai]] is eventually revealed to be in a team-up with [[spoiler: [[WesternAnimation/{{Home}} Captain Smek]]]].
to:
* ''Fanfic/{{Empathy}}'': One of the ForWantOfANail-inspired differences in this universe is that [[WesternAnimation/BigHero6 Yokai]] is eventually revealed to be in a team-up with [[spoiler: [[WesternAnimation/{{Home}} [[WesternAnimation/Home2015 Captain Smek]]]].
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* ''Fanfic/ThereWasOnceAnAvengerFromKrypton'': Chapter 32 of ''The Girl Who Could Knock Out the Hulk'' reveals that [[spoiler: Hercules and Hekate]] are working with Doctor Doom, the former as a means of revenge against the Olympians and the latter to learn more about how Doom got his vast magical powers (which are outside the norm for human mages).
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** The actual [[SufficientlyAdvancedAliens Olympian god]] Ares allied with the [[Series/StargateSG1 Goa'uld]] in ancient times, which has worked so well to the point that the symbiote inside him has ''melded'' with his mind rather than taken him over.
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** The ending of ''Distant Cousins'' reveals a version of this trope regarding [[AllianceOfAlternates multiple versions of the same person]], namely the [[spoiler: Lex Luthors]] of several Earths working together for their shared goal of [[spoiler: killing all the Supermen of TheMultiverse]].
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* In ''Fanfic/RobbReturns'', Chapter 158 reveals that [[spoiler:Euron Greyjoy has allied with the Others (White Walkers and Night King), leading them south of the Wall so they can kill everyone and raise them as wights.]]
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* ''Fanfic/JWITCHSeason1'': In "Enter the Oni", [[WesternAnimation/JackieChanAdventures Tarakudo]] strikes up an alliance with [[WesternAnimation/{{WITCH}} Prince Phobos]], the deal being that in exchange for Phobos providing information on the Chans and the Guardians as well as lending out his minions to search for the Oni masks, Tarakudo will use his Shadowkhan armies to crush the Rebellion for Phobos and ensure his rule over Meridian.
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* ''Fanfic/JWITCHSeason1'': ''Fanfic/JWITCHSeason1'':
** In "Enter the Oni", [[WesternAnimation/JackieChanAdventures Tarakudo]] strikes up an alliance with [[WesternAnimation/{{WITCH}} Prince Phobos]], the deal being that in exchange for Phobos providing information on the Chans and the Guardians as well as lending out his minions to search for the Oni masks, Tarakudo will use his Shadowkhan armies to crush the Rebellion for Phobos and ensure his rule overMeridian.Meridian.
** In "A Challenge of Leadership", [[spoiler: Tarakudo convinces Daolon Wong and Cedric to team up to [[TheStarscream usurp Phobos]] (with both plotting to betray the other)... and then it turns out [[TheChessmaster he was manipulating them into this so that he could expose their plot to Phobos]], thereby strengthening their own alliance.]]
** In "The Shadow Eaters", [[spoiler: Wong cuts a deal with Shendu, offering to alter the ritual to drain Elyon's powers to instead resurrect him, in exchange for Shendu teaching Wong how to control the Shadowkhan without the Oni masks.]]
** In "Enter the Oni", [[WesternAnimation/JackieChanAdventures Tarakudo]] strikes up an alliance with [[WesternAnimation/{{WITCH}} Prince Phobos]], the deal being that in exchange for Phobos providing information on the Chans and the Guardians as well as lending out his minions to search for the Oni masks, Tarakudo will use his Shadowkhan armies to crush the Rebellion for Phobos and ensure his rule over
** In "A Challenge of Leadership", [[spoiler: Tarakudo convinces Daolon Wong and Cedric to team up to [[TheStarscream usurp Phobos]] (with both plotting to betray the other)... and then it turns out [[TheChessmaster he was manipulating them into this so that he could expose their plot to Phobos]], thereby strengthening their own alliance.]]
** In "The Shadow Eaters", [[spoiler: Wong cuts a deal with Shendu, offering to alter the ritual to drain Elyon's powers to instead resurrect him, in exchange for Shendu teaching Wong how to control the Shadowkhan without the Oni masks.]]
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** We later learn that [[VideoGame/TheLegendOfZeldaOracleOfAges Veran]], [[VideoGame/TheLegendOfZeldaOracleOfSeasons Onox]], and [[VideoGame/TheLegendOfZeldaALinkBetweenWorlds Yuga]] are also affiliated with Majora, and that Majora wishes to recruit [[WesternAnimation/MyLittlePonyAndFriends Grogar]] as an ally.
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** We later learn that [[VideoGame/TheLegendOfZeldaOracleOfAges Veran]], [[VideoGame/TheLegendOfZeldaOracleOfSeasons [[VideoGame/TheLegendOfZeldaOracleGames Veran, Onox]], and [[VideoGame/TheLegendOfZeldaALinkBetweenWorlds Yuga]] are also affiliated with Majora, and that Majora wishes to recruit [[WesternAnimation/MyLittlePonyAndFriends Grogar]] as an ally.
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'''Ibac:''' (grinning) "Count me in."
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'''Ibac:''' (grinning) "Count me in.""
* Every story in ''Fanfic/TheStepbrotherSitch'' series involves two or more villains (usually from different shows) teaming up with each other and the heroes having to stop them. ''Hotel Gravity Falls'' sees Kim and Ron hanging a lampshade on how often team-ups happen while fighting one of these -- the rather odd combination of Duff Killigan and Motor Ed.
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* Every story in ''Fanfic/TheStepbrotherSitch'' series involves two or more villains (usually from different shows) teaming up with each other and the heroes having to stop them. ''Hotel Gravity Falls'' sees Kim and Ron hanging a lampshade on how often team-ups happen while fighting one of these -- the rather odd combination of Duff Killigan and Motor Ed.
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* In ''ComicBook/PowerGirl'' fanfic ''Fanfic/AForceOfFour'', Franchise/WonderWoman's enemy Badra and three Kryptonian criminals – Mala, Kizo and U-Ban — join forces to destroy the Amazons, Power Girl and then Earth.
-->"My name is Badra," she said to them, through Mars's alien gases. "I believe you are Mala, Kizo, and U-Ban, of Krypton. We have enemies in common. Let us talk."
* The Franchise/DisneyAnimatedCanon fanfic ''[[http://www.fanfiction.net/s/6048380/1/The_Hellbound_Hearts The Hellbound Hearts]]'' consists of several Disney villains forming a loose companionship to get revenge on their enemies, and eventually take over the world. Then there's another group that wants to take advantage of the war to take over the world. And Frollo... he's just... there.
* In the first story arc of ''ComicBook/{{Supergirl}}'' fanfic ''Fanfic/HellsisterTrilogy'', Mordru bullies Satan Girl, the Legion of Super-Villains and more into serving him. And at the beginning of the second arc, Brainiac and Lex Luthor are putting together an army of villains:
-->"Our foe, the Anti-Monitor, has fled or has died. Not even I can detect his presence, either in our universe, or in his. My calculations must be true. The Crisis he created is over. But great unsettlement remains. We all crave power, for various reasons. Now is the time to strike. Not even the heroes of the five remaining Earths can withstand our combined power."\\
Not all of those who listened to Brainiac nodded, but most knew the truth of that. Super-villains outnumbered super-heroes by a factor no one had yet calculated. If they all struck at once, in coordinated effort, little could be beyond their grasp. Better yet, within their grasp might be the lives of those heroes who had opposed them, defeated them, imprisoned them.
* ''FanFic/UltimateSleepwalker: The New Dreams'' plays this trope with an unusual spin. Instead of any of Sleepwalker's enemies teaming up, it's ComicBook/SpiderMan's enemies that reunite as the Sinister Six to carry out Doctor Octopus's latest diabolical scheme. Sleepwalker and several other heroes are hastily recruited by the web-slinger into an impromptu team to even the odds.
** A very similar story happened in the ''Revenge of the Sinister Six" storyarc in which Spidey enlists the aid of Sleepwalker and other heroes in order to fight Doc Ock and the SS.
* ''FanFic/ADarkKnightOverSinCity'' has various Franchise/{{Batman}} villains teaming up with ''ComicBook/SinCity'' villains.
* ''Fanfic/FalloutEquestria'':
** Red Eye and the Goddess, though both are plotting behind each other's back.
** Subverted example: the Enclave tries to form one with [[spoiler:the Goddess. Since she has just a few minutes before been killed by a megaspell when they make the offer, the Enclave has incredibly bad timing]].
* ''FanFic/GettingBackOnYourHooves'': the story's definite BigBad, [[TheChessmaster Checker]] [[TheSociopath Monarch]], employs the Diamond Dogs to help her ruin [[spoiler: her sister]] Trixie's life. It's worth noting that the Dogs don't care about this goal, and they have no real agenda of their own either -- they're [[OnlyInItForTheMoney Only In It For The Gems]]. [[spoiler: Which is what allows Rarity to buy them off during the climax. Well, that, and the fact they find out that Checker was planning on double crossing them anyway.]]
* PlayedWith in the ''FanFic/CalvinAtCamp'' episode "A Stalkers Life"--multiple villains appear to attack the kids, yet they do nothing but trip each other up.
* ''FanFic/FacingTheFutureSeries'':
** In ''Strength in Numbers'', Desiree recruits several of Danny's other ghostly enemies in order to finally beat him.
** In ''Bad Breakup'', an even larger number of ghosts team up to break up Danny and Sam, due to the latter's new powers making them [[BattleCouple too tough to take on together]].
** In ''Paired Together'', after Skulker and Technus accidentally get fused together, they decide to make the situation work to their advantage [[spoiler: until Technus double crosses Skulker]].
** In ''What She Wants'', Sydney Pointdexter decides to help Desiree overcome her AchillesHeel of needing to grant ''all'' wishes she hears [[spoiler: because he's fallen in love with her]].
** In ''Ancient History'', Hotep-Ra manipulates [[EnemyWithout Ghost Tucker]] into an alliance against the heroes.
* ''FanFic/EarthAndSky'': After Chrysalis [[spoiler: replaces Diamond Tiara, her husband]] Prince Blueblood discovers it, and takes advantage of the situation to strike a deal -- he'll stay quiet about what he knows, in exchange for Chrysalis using her new position to [[spoiler: help him gain power of attorney over his wife's fortune]]. However, the deal ends up falling through when [[spoiler: Chrysalis exposes herself to avoid getting arrested for the real Diamond Tiara's crimes only to get arrested anyway, at which point Blueblood throws her under the bus to protect his own hide]].
* ''FanFic/BurningBlack'': Remy has coerced both Crocker and Dr. Bender into working for him, and at the same time is in a secret alliance with [[spoiler: the Pixies]], which even the other villains are unaware of.
* ''Fanfic/OliviaGoesWest'': After Cat R. Waul from ''WesternAnimation/AnAmericanTail: Fievel Goes West'' rescues Ratigan from ''WesternAnimation/TheGreatMouseDetective'' from falling to his death from Big Ben, Waul takes Professor Ratigan to America in a scheme to run him for president and take over the country.
* ''Fanfic/{{XSGCOM}}'': Near the end of the first story, [[OmnicidalManiac Anubis]] and [[EvilutionaryBiologist Loki]] strike a resource-sharing alliance against Earth and the System Lords.
* The Pooh's Adventures series pulls this off tons of times. The villain of the movie Pooh is going through will almost always have back up from another villain. And then there are times when an entire LegionOfDoom teams up with a villain, or have them join their ranks.
* ''FanFic/MyBravePonyStarfleetMagic'':
** Nightmare Moon and Titan's henchmen team up in order to take over Equestria.
** A smaller-scale example occurs in Episode 16 of ''My Brave Pony: Starfleet Magic III'', where Raven and Harkin team up.
* ''FanFic/JusticeLeagueOfEquestria'':
** During the second arc of ''Mare of Steel'', [[ComicBook/LexLuthor Alexander Silversmith]] and ComicBook/{{Brainiac}} ally against Supermare. This alliance technically includes [[GeneralRipper Steel Wing]] as well, but it's clear from the beginning that he's just Brainiac's UnwittingPawn [[spoiler: and he gets [[YouHaveOutlivedYourUsefulness thrown under the bus once he's no longer needed.]]]]
** While ''The Princess of Themyscria'' does not itself have villains teaming up, one of its {{Sequel Hook}}s suggests a future alliance between [[GodOfEvil Ares]] and [[WickedWitch Circe]], when the two meet after [[spoiler: Diana defeats Ares and traps him in Tartarus, where Circe is already a prisoner]].
* ''FanFic/ThePowersOfHarmony'': Chrysalis frees Sombra from his [[SealedEvilInACan imprisonment]] in order to help her take over the Crystal Empire (and by extension, all of Tarandus) as part of her larger plan for a full-scale invasion of Equestria. She keeps him on a short leash, however, which makes him plot against her even more than he probably already would be anyway.
* ''FanFic/ShadowsAwakening'':
** [[EvilSorcerer Daolon Wong]] and [[OurGhostsAreDifferent The Phantom/Kyosuke]] ally fairly early on in the story, with The Phantom making it perfectly clear that he's only using Wong to further his own agenda. And then it turns out that [[EnemyWithin The Queen]] and [[SealedEvilInACan Tarakudo]] are operating under a similar setup.
** Near the end of the story, [[spoiler:it turns out that the Queen and Kyosuke cut a deal behind their partners' backs; on condition of Wong's failure and the Queen proving herself a more worthy ruler of the Shadowkhan, Kyosuke will pledge loyalty to her. This is exactly what comes to pass.]]
* ''FanFic/DaveStdiderPokemonTraner'': [[GoldFishPoopGang Team Bad]] and [[DeadpanSnarker Elite Four Boss]] have teamed up on several occasions in order to accomplish absolutely nothing, because they all really suck.
* In ''FanFic/MegaManReawakened'', Dr. Wily is allied with Glyde and his Birdbots.
* ''Fanfic/TheLionKingAdventures'':
** [[EvilSorcerer Hago]] and [[EvilUncle Scar]], the two main villains of Series One, team up in ''King's Ransom'' to eliminate Simba and Nala and take over the Pride Lands. However, when this plan fails, they blame each other and go their separate ways... until ''Army of Evil'', where Hago convinces Scar to team up again, leading to the successful conquest of the Pride Lands. This lasts until the following story, ''Friends to the End'', where [[spoiler: Scar goes [[AxCrazy insane]], causing Hago to [[BadGuysDoTheDirtyWork kill him]]]].
** ''Rebirth'' sees [[WhoWantsToLiveForever Shocker]], [[PsychoForHire the Interceptor]], and [[BigBadWannabe Froggy]] team up to resurrect [[spoiler: Scar]] and use him to destroy Simba and his friends. Even after this plan falls through and Froggy runs away, Shocker and the Interceptor stay in an increasingly-strained alliance for the rest of Series Four, which ends with [[spoiler: the Interceptor throwing Shocker into the lava destroying the Pride Lands in a ([[CompleteImmortality failed]]) attempt to kill him]].
** ''One Bad Night'' sees Froggy return and ally with Simba's EnemyWithin, the King of Dreams, in an attempt to trap Simba in the dream world and kill him. [[spoiler: As soon as he's [[YouHaveOutlivedYourUsefulness no longer needed]], the King kills Froggy]].
* ''FanFic/WhenWorldsCollideMarioSonicAndMegaManCrossover'' has Bowser, Dr. Eggman, and Dr. Wily teaming up to take on their respective enemies.
* ''Fanfic/MortalKombatVsTheOwlHouse'': [[spoiler:Shang Tsung and Quan Chi team up in Chapter 12 which also includes Noob Saibot working for Quan Chi and Kano recently pledging his loyalty to Shang Tsung as well as Sektor doing the same two chapters earlier to Quan Chi.]]
* ''FanFic/TheEquestrianWindMage'':
** [[TheDragon Dethl]] and [[EvilOverlord Sombra]] ally at the end of Season One, with the former promising the latter [[HellHound aid]] in reclaiming the Crystal Empire, in exchange for agreeing to serve as the [[ReligionOfEvil Church of Majora's]] representative in Equestria.
** It is mentioned that [[VideoGame/TheLegendOfZeldaSkywardSword Ghirahim]] and [[VideoGame/TheLegendOfZeldaSpiritTracks Chancellor Cole]] are working with Dethl.
** When Ganondorf arrives in Season 2, [[VideoGame/StoryOfTheBlanks Grey Hoof]] is one of the beings he recruits to help enforce his rule.
** Majora intends to recruit Ahuizotl and his followers, in order to form a base core for the Church's presence in Equestria... and then to kill Ahuizotl himself [[YouHaveOutlivedYourUsefulness when he's no longer necessary]]. [[spoiler: Ghirahim lets this slip, causing Ahuizotl to [[EnemyMine team up with Daring Do]] and flee.]]
** We later learn that [[VideoGame/TheLegendOfZeldaOracleOfAges Veran]], [[VideoGame/TheLegendOfZeldaOracleOfSeasons Onox]], and [[VideoGame/TheLegendOfZeldaALinkBetweenWorlds Yuga]] are also affiliated with Majora, and that Majora wishes to recruit [[WesternAnimation/MyLittlePonyAndFriends Grogar]] as an ally.
** Sombra recruits [[WesternAnimation/MyLittlePonyEquestriaGirls Sunset Shimmer]] and [[Recap/MyLittlePonyFriendshipIsMagicS5E1TheCutieMapPart1 Starlight]] [[Recap/MyLittlePonyFriendshipIsMagicS5E2TheCutieMapPart2 Glimmer]] to the Church of Majora; the former with promises of finally [[AGodAmI becoming an alicorn]], the latter in order to spread her [[TheEvilsOfFreeWill twisted views on harmony]].
** After Grogar is recruited, he is used to recruit [[ManaDrain Tirek]] as well.
* In ''Fanfic/ShadowsOfGiants'', King Ghidorah gathers Gigan, Monster X, Destoroyah, [=SpaceGodzilla=], and Hedorah and convinces them to team up and get revenge against Godzilla.
* ''Fanfic/FriendshipIsMagicalGirls'':
** For most of the Magic Arc, there's a tenuous alliance between Sunset Shimmer and Chrysalis, who are each using the other to achieve their individual goals; this later expands to include Trixie, whom Sunset hires to aid in eliminating the Element Bearers. However, this alliance ultimately falls apart when [[spoiler: Sunset backstabs Chrysalis for her own ends; Trixie realizes that she'll be betrayed too, so betrays Sunset first.]]
** Halfway through the Loyalty Arc, [[spoiler: [[AdaptationalVillainy Flash Sentry]]]] sets out to recruit Trixie to aid his people in their own plans against the mahoushoujo.
* ''Fanfic/{{Webwork}}'': It's eventually revealed that [[EvilSorcerer Daolon Wong]] and [[DiabolicalMastermind Bartholomew Chang]] forged an alliance offscreen at some point between their respective [[VillainExitStageLeft escapes]] from the J-Team. And then they pretty much press-gang [[PaperMaster Kasahara/Origami]] into the alliance as well [[spoiler: after he's {{depower}}ed by the heroes]].
* In the Fanfic/ElementalChessTrilogy, it's [[TheReveal revealed]] in the third installment that [[spoiler:the villains of the first and second stories are working together.]]
* Happens a few times in the [[Fanfic/{{Cinderjuice}} Contractually Obligated Chaos]] series. In the first story, a handful of canon characters from [[WesternAnimation/{{Beetlejuice}} the show]] come together to make things difficult for the heroes. In the third story, the OriginalCharacter ArcVillain gets some support from an extremely minor character who appeared in one episode.
* ''Fanfic/ChildOfTheStorm'':
** A major plot point of the first book is [[MagnificentBastard Lucius Malfoy]] forging an alliance with [[NebulousEvilOrganization HYDRA]] and [[EvilSorcerer Gravemoss]].
** The first book's epilogue reveals that the resurrected Voldemort has allied with [[ComicBook/XMen Selene]].
** And in the sequel, [[spoiler: Sinister]] is revealed to be working with the Red Room.
** Also in the sequel, Voldemort concludes an additional alliance with [[VampireMonarch Dracula]]... who promptly pulls an EvilerThanThou on him.
* ''Fanfic/{{Empathy}}'': One of the ForWantOfANail-inspired differences in this universe is that [[WesternAnimation/BigHero6 Yokai]] is eventually revealed to be in a team-up with [[spoiler: [[WesternAnimation/{{Home}} Captain Smek]]]].
* One of the main plot points of ''Fanfic/TheNewAdventuresOfInvaderZim'' is that Zim meets and allies with the [[OurVampiresAreDifferent vampire]] Norlock, who offers aid in his conquest of Earth ([[ItAmusedMe mostly for his own amusement]]).
* The main antagonists of ''FanFic/IWarrior'' are a renegade faction of [[ScaryDogmaticAliens Yuuzhan Vong]] who have allied with the enigmatic Sith Lord known as TheMaster [[spoiler: who's actually a clone of Anakin Solo]].
* ''FanFic/SonOfTheSevenKingdoms'':
** [[EvilPrince Viserys]] eventually allies with the [[ReligionOfEvil Mythic Dawn]].
** [[OurVampiresAreDifferent Clan Volkihar]] is revealed to be working with the [[ZombieApocalypse White Walkers]] [[spoiler: who are [[TheManBehindTheMan serving]] [[TheDreaded Alduin]]]].
* ''Fanfic/GuardiansWizardsAndKungFuFighters'': When Daolon Wong becomes TheStarscream to Phobos, not only does his [[VillainousFriendship buddy]] the Tracker join him in his plotting, but [[DragonWithAnAgenda Cedric]] strikes up an alliance as well. [[spoiler: When his plans fall apart due to Cedric betraying him, a desperate Wong allies with a Jiangshi in order to regain his power.]]
* The ''Franchise/{{Batman}}'' and ''WesternAnimation/MiraculousLadybug'' fanfic, ''Fanfic/MiraculousKnight'', features the Joker, the Riddler, and Hawk Moth teaming up [[spoiler:with the Joker ending up as the last of the villains to deal with as the Riddler gets captured, and the Joker kills Hawk Moth to get Ladybug and Cat Noir's powers for himself.]]
* ''Fanfic/EarthsAlienHistory'' has a few examples:
** The [[ComicStrip/DanDare Mekon]] allies with the [[Franchise/StarTrek Romulans]] and [[Anime/SpaceBattleshipYamato Gamilans]] in order to invade [[Franchise/MassEffect Citadel]] space.
** The [[ComicBook/TheFlash Reverse-Flash]] joins up with Franchise/FactionParadox in order to manipulate the timeline for their own ends. They also make temporary alliances with [[VideoGame/{{Turok}} the Primagen]] and the Reapers at various points for specific plans.
** The [[Franchise/{{Transformers}} Decepticons]] and [[Series/MightyMorphinPowerRangers Rita Repulsa]] team up, mostly due to both taking up residence on Earth's moon and not viewing each other as a threat because of their exclusive goals (the Decepticons want resources from Earth to help conquer Cybertron, Rita wants the Earth itself).
** Scorponok's [[RenegadeSplinterFaction rogue faction]] of Decepticons end up allying with the [[Literature/TheSagaOfSevenSuns Klikiss robots]] to make war against all organic life. [[spoiler: After Scorponok and the other main Decepticons are all killed, the remnants of the group are then taken over by [[Series/DoctorWho the Master]].]]
* ''Fanfic/RainbowDoubleDashsLunaverse:'' By the end of the first series, four corrupt politicians have teamed up to try and get the Element Bearers under their hooves - [[BigBad Greengrass]], Archduke Fisher, Puissance, and [[BigBadWannabe Blueblood]]. And by the time we see them working together, Puissance has inadervtantly removed herself from the team-up being distracted by shiny new technology. Meanwhile, Greengrass and Fisher are already trying to get Blueblood out of the way.
* ''Fanfic/AnEmpireOfIceAndFire'': After Daenerys only mutilates him instead of having him killed, an even more crazed Viserys makes his way to Westeros, where he happens to encounter Ramsay Bolton. The two quickly strike an alliance, with Ramsay supporting Viserys' attempts to claim the Iron Throne in exchange for Daenerys eventually being given to him as a forced bride; Walder Frey later gets in on this, offering his support in exchange for even more power in Viserys' regime. And true to this trope, Ramsay is quickly shown to be plotting to remove Viserys once he has Daenerys.
* In [[https://www.fimfiction.net/stories?q=luna+aeternal Luna Aeternal]] we have two genocidal terrorist groups representing humans and ponies trying to stop a pony/ human peace treaty. Despite the fact they fully intend to wipe out each others species they come very close to winning. The reason they get along so well is that both sides fully believe they will be in an advantageous position over the other when their alliance is over.
* Happens a lot in ''Fanfic/InfinityCrisis'':
** The first story has Thanos forming a "Masters of Evil" with [[spoiler: the Red Skull, Hela and Malektih.]]
** ''Of Kryptonians and Queens'' has Morgana recruit Etrigan to aid in her plans [[spoiler: and after being banished from Earth-38 she allies with Doctor Doom]].
** ''Powers and Marvels'' has Lord Zedd and Rita Repulsa joining with the Mandarian. The story's end has [[spoiler: a maimed Mandarian rescued by the High Evolutionary.]]
** ''Gamma Relations'' sees the Leader, Mr. Sinister and Otto Octavius joining in a scientific collective [[spoiler: bankrolled by Norman Osborn]].
** ''Sins, Sirens & Strife'' first has the Enchantress enslaving Bane to aid her. She then frees Circe from prison, and then the duo recruit Dr. Sivana, Mister Mind, Ibac and Black Adam to their cause.
** ''Counterpart Conferences'':
*** Chapter 2 has Hordak and Skeletor agree to bury the hatchet and renew their old partnership to conquer Third Earth, Eternia and Etheria.
*** The Ra's al Ghul of the DCAU Earth offers an alliance to his Earth-51 counterpart.
*** Chapter 5 has Cobra and the Decepticons entering into an alliance to conquer Earth for Cobra who will then give the Decepticons the Allspark to take over Cybertron.
*** The end of Chapter 8 sees [[spoiler: Fiona the Black Fairy making an offer of alliance to Morgana]].
** Subverted in ''Of Hand and Foot'' as the Foot, the Hand and the Kingpin are ready to go to war with each other.
** ''Justice Like Thunder'' reveals that the Thunderbolts' whole BoxedCrook setup is actually a con engineered by [[spoiler: Osborn and Mysterio, who are planning to also form the series' version of the Sinister Six.]]
** ''Brothers of Thunder'' has the Earth-8092 versions of Red Skull, Baron Von Strucker, and Baron Zemo putting aside their differences to reunite, and also ally with Loki, Malekith, and a Surtur-possessed Enchantress to [[spoiler:invade Asgard]]. It also turns out that Loki has a side deal with Dormammu that the others don't know about, to give the latter control of Earth.
** ''Tales of the Beyond'' has Gasket and Archerina teaming up with Vexus to build a New Machine Empire in Jimmy Neutron's universe. It's quickly made clear that both sides are plotting to betray each other as soon as they [[YouHaveOutlivedYourUsefulness outlive their usefulness]].
** ''Tomorrow's Guardians'' has Ultron taking over leadership of the Kaylon to wipe out all organics in the ''Orville'' universe.
* In ''Fanfic/JackieChanAdventuresOlympianJourney'', Vanessa Barone, Zhixin and Origami team up in the first chapter in order to get revenge on Jackie. And after [[BigBad Eris]] is released from her [[SealedEvilInACan imprisonment]], they're recruited to serve as [[QuirkyMinibossSquad her muscle]].
* In ''Fanfic/WithThisRingGreenLantern'', Star Sapphire -- possessed by her split personality the Predator -- and Hector Hammond join forces to destroy Hal Jordan. It isn't a cordial partnership, though.
* ''Fanfic/JWITCHSeason1'': In "Enter the Oni", [[WesternAnimation/JackieChanAdventures Tarakudo]] strikes up an alliance with [[WesternAnimation/{{WITCH}} Prince Phobos]], the deal being that in exchange for Phobos providing information on the Chans and the Guardians as well as lending out his minions to search for the Oni masks, Tarakudo will use his Shadowkhan armies to crush the Rebellion for Phobos and ensure his rule over Meridian.
* In ''ComicBook/{{Shazam}}'' fanfiction ''Fanfic/HereThereBeMonsters'', Dr. Sivana tracks down every villain fought by the Marvel Family to recruit them into his new super-villain team.
-->'''Dr. Sivana:''' "We've got a big job for you, Ibac. I'm putting the Monster Society back together again. This time, we're going to take those three little costumed trolls that have caused us so much grief over the years, and kill them. That's just for starters."\\
'''Ibac:''' (grinning) "Count me in."
-->"My name is Badra," she said to them, through Mars's alien gases. "I believe you are Mala, Kizo, and U-Ban, of Krypton. We have enemies in common. Let us talk."
* The Franchise/DisneyAnimatedCanon fanfic ''[[http://www.fanfiction.net/s/6048380/1/The_Hellbound_Hearts The Hellbound Hearts]]'' consists of several Disney villains forming a loose companionship to get revenge on their enemies, and eventually take over the world. Then there's another group that wants to take advantage of the war to take over the world. And Frollo... he's just... there.
* In the first story arc of ''ComicBook/{{Supergirl}}'' fanfic ''Fanfic/HellsisterTrilogy'', Mordru bullies Satan Girl, the Legion of Super-Villains and more into serving him. And at the beginning of the second arc, Brainiac and Lex Luthor are putting together an army of villains:
-->"Our foe, the Anti-Monitor, has fled or has died. Not even I can detect his presence, either in our universe, or in his. My calculations must be true. The Crisis he created is over. But great unsettlement remains. We all crave power, for various reasons. Now is the time to strike. Not even the heroes of the five remaining Earths can withstand our combined power."\\
Not all of those who listened to Brainiac nodded, but most knew the truth of that. Super-villains outnumbered super-heroes by a factor no one had yet calculated. If they all struck at once, in coordinated effort, little could be beyond their grasp. Better yet, within their grasp might be the lives of those heroes who had opposed them, defeated them, imprisoned them.
* ''FanFic/UltimateSleepwalker: The New Dreams'' plays this trope with an unusual spin. Instead of any of Sleepwalker's enemies teaming up, it's ComicBook/SpiderMan's enemies that reunite as the Sinister Six to carry out Doctor Octopus's latest diabolical scheme. Sleepwalker and several other heroes are hastily recruited by the web-slinger into an impromptu team to even the odds.
** A very similar story happened in the ''Revenge of the Sinister Six" storyarc in which Spidey enlists the aid of Sleepwalker and other heroes in order to fight Doc Ock and the SS.
* ''FanFic/ADarkKnightOverSinCity'' has various Franchise/{{Batman}} villains teaming up with ''ComicBook/SinCity'' villains.
* ''Fanfic/FalloutEquestria'':
** Red Eye and the Goddess, though both are plotting behind each other's back.
** Subverted example: the Enclave tries to form one with [[spoiler:the Goddess. Since she has just a few minutes before been killed by a megaspell when they make the offer, the Enclave has incredibly bad timing]].
* ''FanFic/GettingBackOnYourHooves'': the story's definite BigBad, [[TheChessmaster Checker]] [[TheSociopath Monarch]], employs the Diamond Dogs to help her ruin [[spoiler: her sister]] Trixie's life. It's worth noting that the Dogs don't care about this goal, and they have no real agenda of their own either -- they're [[OnlyInItForTheMoney Only In It For The Gems]]. [[spoiler: Which is what allows Rarity to buy them off during the climax. Well, that, and the fact they find out that Checker was planning on double crossing them anyway.]]
* PlayedWith in the ''FanFic/CalvinAtCamp'' episode "A Stalkers Life"--multiple villains appear to attack the kids, yet they do nothing but trip each other up.
* ''FanFic/FacingTheFutureSeries'':
** In ''Strength in Numbers'', Desiree recruits several of Danny's other ghostly enemies in order to finally beat him.
** In ''Bad Breakup'', an even larger number of ghosts team up to break up Danny and Sam, due to the latter's new powers making them [[BattleCouple too tough to take on together]].
** In ''Paired Together'', after Skulker and Technus accidentally get fused together, they decide to make the situation work to their advantage [[spoiler: until Technus double crosses Skulker]].
** In ''What She Wants'', Sydney Pointdexter decides to help Desiree overcome her AchillesHeel of needing to grant ''all'' wishes she hears [[spoiler: because he's fallen in love with her]].
** In ''Ancient History'', Hotep-Ra manipulates [[EnemyWithout Ghost Tucker]] into an alliance against the heroes.
* ''FanFic/EarthAndSky'': After Chrysalis [[spoiler: replaces Diamond Tiara, her husband]] Prince Blueblood discovers it, and takes advantage of the situation to strike a deal -- he'll stay quiet about what he knows, in exchange for Chrysalis using her new position to [[spoiler: help him gain power of attorney over his wife's fortune]]. However, the deal ends up falling through when [[spoiler: Chrysalis exposes herself to avoid getting arrested for the real Diamond Tiara's crimes only to get arrested anyway, at which point Blueblood throws her under the bus to protect his own hide]].
* ''FanFic/BurningBlack'': Remy has coerced both Crocker and Dr. Bender into working for him, and at the same time is in a secret alliance with [[spoiler: the Pixies]], which even the other villains are unaware of.
* ''Fanfic/OliviaGoesWest'': After Cat R. Waul from ''WesternAnimation/AnAmericanTail: Fievel Goes West'' rescues Ratigan from ''WesternAnimation/TheGreatMouseDetective'' from falling to his death from Big Ben, Waul takes Professor Ratigan to America in a scheme to run him for president and take over the country.
* ''Fanfic/{{XSGCOM}}'': Near the end of the first story, [[OmnicidalManiac Anubis]] and [[EvilutionaryBiologist Loki]] strike a resource-sharing alliance against Earth and the System Lords.
* The Pooh's Adventures series pulls this off tons of times. The villain of the movie Pooh is going through will almost always have back up from another villain. And then there are times when an entire LegionOfDoom teams up with a villain, or have them join their ranks.
* ''FanFic/MyBravePonyStarfleetMagic'':
** Nightmare Moon and Titan's henchmen team up in order to take over Equestria.
** A smaller-scale example occurs in Episode 16 of ''My Brave Pony: Starfleet Magic III'', where Raven and Harkin team up.
* ''FanFic/JusticeLeagueOfEquestria'':
** During the second arc of ''Mare of Steel'', [[ComicBook/LexLuthor Alexander Silversmith]] and ComicBook/{{Brainiac}} ally against Supermare. This alliance technically includes [[GeneralRipper Steel Wing]] as well, but it's clear from the beginning that he's just Brainiac's UnwittingPawn [[spoiler: and he gets [[YouHaveOutlivedYourUsefulness thrown under the bus once he's no longer needed.]]]]
** While ''The Princess of Themyscria'' does not itself have villains teaming up, one of its {{Sequel Hook}}s suggests a future alliance between [[GodOfEvil Ares]] and [[WickedWitch Circe]], when the two meet after [[spoiler: Diana defeats Ares and traps him in Tartarus, where Circe is already a prisoner]].
* ''FanFic/ThePowersOfHarmony'': Chrysalis frees Sombra from his [[SealedEvilInACan imprisonment]] in order to help her take over the Crystal Empire (and by extension, all of Tarandus) as part of her larger plan for a full-scale invasion of Equestria. She keeps him on a short leash, however, which makes him plot against her even more than he probably already would be anyway.
* ''FanFic/ShadowsAwakening'':
** [[EvilSorcerer Daolon Wong]] and [[OurGhostsAreDifferent The Phantom/Kyosuke]] ally fairly early on in the story, with The Phantom making it perfectly clear that he's only using Wong to further his own agenda. And then it turns out that [[EnemyWithin The Queen]] and [[SealedEvilInACan Tarakudo]] are operating under a similar setup.
** Near the end of the story, [[spoiler:it turns out that the Queen and Kyosuke cut a deal behind their partners' backs; on condition of Wong's failure and the Queen proving herself a more worthy ruler of the Shadowkhan, Kyosuke will pledge loyalty to her. This is exactly what comes to pass.]]
* ''FanFic/DaveStdiderPokemonTraner'': [[GoldFishPoopGang Team Bad]] and [[DeadpanSnarker Elite Four Boss]] have teamed up on several occasions in order to accomplish absolutely nothing, because they all really suck.
* In ''FanFic/MegaManReawakened'', Dr. Wily is allied with Glyde and his Birdbots.
* ''Fanfic/TheLionKingAdventures'':
** [[EvilSorcerer Hago]] and [[EvilUncle Scar]], the two main villains of Series One, team up in ''King's Ransom'' to eliminate Simba and Nala and take over the Pride Lands. However, when this plan fails, they blame each other and go their separate ways... until ''Army of Evil'', where Hago convinces Scar to team up again, leading to the successful conquest of the Pride Lands. This lasts until the following story, ''Friends to the End'', where [[spoiler: Scar goes [[AxCrazy insane]], causing Hago to [[BadGuysDoTheDirtyWork kill him]]]].
** ''Rebirth'' sees [[WhoWantsToLiveForever Shocker]], [[PsychoForHire the Interceptor]], and [[BigBadWannabe Froggy]] team up to resurrect [[spoiler: Scar]] and use him to destroy Simba and his friends. Even after this plan falls through and Froggy runs away, Shocker and the Interceptor stay in an increasingly-strained alliance for the rest of Series Four, which ends with [[spoiler: the Interceptor throwing Shocker into the lava destroying the Pride Lands in a ([[CompleteImmortality failed]]) attempt to kill him]].
** ''One Bad Night'' sees Froggy return and ally with Simba's EnemyWithin, the King of Dreams, in an attempt to trap Simba in the dream world and kill him. [[spoiler: As soon as he's [[YouHaveOutlivedYourUsefulness no longer needed]], the King kills Froggy]].
* ''FanFic/WhenWorldsCollideMarioSonicAndMegaManCrossover'' has Bowser, Dr. Eggman, and Dr. Wily teaming up to take on their respective enemies.
* ''Fanfic/MortalKombatVsTheOwlHouse'': [[spoiler:Shang Tsung and Quan Chi team up in Chapter 12 which also includes Noob Saibot working for Quan Chi and Kano recently pledging his loyalty to Shang Tsung as well as Sektor doing the same two chapters earlier to Quan Chi.]]
* ''FanFic/TheEquestrianWindMage'':
** [[TheDragon Dethl]] and [[EvilOverlord Sombra]] ally at the end of Season One, with the former promising the latter [[HellHound aid]] in reclaiming the Crystal Empire, in exchange for agreeing to serve as the [[ReligionOfEvil Church of Majora's]] representative in Equestria.
** It is mentioned that [[VideoGame/TheLegendOfZeldaSkywardSword Ghirahim]] and [[VideoGame/TheLegendOfZeldaSpiritTracks Chancellor Cole]] are working with Dethl.
** When Ganondorf arrives in Season 2, [[VideoGame/StoryOfTheBlanks Grey Hoof]] is one of the beings he recruits to help enforce his rule.
** Majora intends to recruit Ahuizotl and his followers, in order to form a base core for the Church's presence in Equestria... and then to kill Ahuizotl himself [[YouHaveOutlivedYourUsefulness when he's no longer necessary]]. [[spoiler: Ghirahim lets this slip, causing Ahuizotl to [[EnemyMine team up with Daring Do]] and flee.]]
** We later learn that [[VideoGame/TheLegendOfZeldaOracleOfAges Veran]], [[VideoGame/TheLegendOfZeldaOracleOfSeasons Onox]], and [[VideoGame/TheLegendOfZeldaALinkBetweenWorlds Yuga]] are also affiliated with Majora, and that Majora wishes to recruit [[WesternAnimation/MyLittlePonyAndFriends Grogar]] as an ally.
** Sombra recruits [[WesternAnimation/MyLittlePonyEquestriaGirls Sunset Shimmer]] and [[Recap/MyLittlePonyFriendshipIsMagicS5E1TheCutieMapPart1 Starlight]] [[Recap/MyLittlePonyFriendshipIsMagicS5E2TheCutieMapPart2 Glimmer]] to the Church of Majora; the former with promises of finally [[AGodAmI becoming an alicorn]], the latter in order to spread her [[TheEvilsOfFreeWill twisted views on harmony]].
** After Grogar is recruited, he is used to recruit [[ManaDrain Tirek]] as well.
* In ''Fanfic/ShadowsOfGiants'', King Ghidorah gathers Gigan, Monster X, Destoroyah, [=SpaceGodzilla=], and Hedorah and convinces them to team up and get revenge against Godzilla.
* ''Fanfic/FriendshipIsMagicalGirls'':
** For most of the Magic Arc, there's a tenuous alliance between Sunset Shimmer and Chrysalis, who are each using the other to achieve their individual goals; this later expands to include Trixie, whom Sunset hires to aid in eliminating the Element Bearers. However, this alliance ultimately falls apart when [[spoiler: Sunset backstabs Chrysalis for her own ends; Trixie realizes that she'll be betrayed too, so betrays Sunset first.]]
** Halfway through the Loyalty Arc, [[spoiler: [[AdaptationalVillainy Flash Sentry]]]] sets out to recruit Trixie to aid his people in their own plans against the mahoushoujo.
* ''Fanfic/{{Webwork}}'': It's eventually revealed that [[EvilSorcerer Daolon Wong]] and [[DiabolicalMastermind Bartholomew Chang]] forged an alliance offscreen at some point between their respective [[VillainExitStageLeft escapes]] from the J-Team. And then they pretty much press-gang [[PaperMaster Kasahara/Origami]] into the alliance as well [[spoiler: after he's {{depower}}ed by the heroes]].
* In the Fanfic/ElementalChessTrilogy, it's [[TheReveal revealed]] in the third installment that [[spoiler:the villains of the first and second stories are working together.]]
* Happens a few times in the [[Fanfic/{{Cinderjuice}} Contractually Obligated Chaos]] series. In the first story, a handful of canon characters from [[WesternAnimation/{{Beetlejuice}} the show]] come together to make things difficult for the heroes. In the third story, the OriginalCharacter ArcVillain gets some support from an extremely minor character who appeared in one episode.
* ''Fanfic/ChildOfTheStorm'':
** A major plot point of the first book is [[MagnificentBastard Lucius Malfoy]] forging an alliance with [[NebulousEvilOrganization HYDRA]] and [[EvilSorcerer Gravemoss]].
** The first book's epilogue reveals that the resurrected Voldemort has allied with [[ComicBook/XMen Selene]].
** And in the sequel, [[spoiler: Sinister]] is revealed to be working with the Red Room.
** Also in the sequel, Voldemort concludes an additional alliance with [[VampireMonarch Dracula]]... who promptly pulls an EvilerThanThou on him.
* ''Fanfic/{{Empathy}}'': One of the ForWantOfANail-inspired differences in this universe is that [[WesternAnimation/BigHero6 Yokai]] is eventually revealed to be in a team-up with [[spoiler: [[WesternAnimation/{{Home}} Captain Smek]]]].
* One of the main plot points of ''Fanfic/TheNewAdventuresOfInvaderZim'' is that Zim meets and allies with the [[OurVampiresAreDifferent vampire]] Norlock, who offers aid in his conquest of Earth ([[ItAmusedMe mostly for his own amusement]]).
* The main antagonists of ''FanFic/IWarrior'' are a renegade faction of [[ScaryDogmaticAliens Yuuzhan Vong]] who have allied with the enigmatic Sith Lord known as TheMaster [[spoiler: who's actually a clone of Anakin Solo]].
* ''FanFic/SonOfTheSevenKingdoms'':
** [[EvilPrince Viserys]] eventually allies with the [[ReligionOfEvil Mythic Dawn]].
** [[OurVampiresAreDifferent Clan Volkihar]] is revealed to be working with the [[ZombieApocalypse White Walkers]] [[spoiler: who are [[TheManBehindTheMan serving]] [[TheDreaded Alduin]]]].
* ''Fanfic/GuardiansWizardsAndKungFuFighters'': When Daolon Wong becomes TheStarscream to Phobos, not only does his [[VillainousFriendship buddy]] the Tracker join him in his plotting, but [[DragonWithAnAgenda Cedric]] strikes up an alliance as well. [[spoiler: When his plans fall apart due to Cedric betraying him, a desperate Wong allies with a Jiangshi in order to regain his power.]]
* The ''Franchise/{{Batman}}'' and ''WesternAnimation/MiraculousLadybug'' fanfic, ''Fanfic/MiraculousKnight'', features the Joker, the Riddler, and Hawk Moth teaming up [[spoiler:with the Joker ending up as the last of the villains to deal with as the Riddler gets captured, and the Joker kills Hawk Moth to get Ladybug and Cat Noir's powers for himself.]]
* ''Fanfic/EarthsAlienHistory'' has a few examples:
** The [[ComicStrip/DanDare Mekon]] allies with the [[Franchise/StarTrek Romulans]] and [[Anime/SpaceBattleshipYamato Gamilans]] in order to invade [[Franchise/MassEffect Citadel]] space.
** The [[ComicBook/TheFlash Reverse-Flash]] joins up with Franchise/FactionParadox in order to manipulate the timeline for their own ends. They also make temporary alliances with [[VideoGame/{{Turok}} the Primagen]] and the Reapers at various points for specific plans.
** The [[Franchise/{{Transformers}} Decepticons]] and [[Series/MightyMorphinPowerRangers Rita Repulsa]] team up, mostly due to both taking up residence on Earth's moon and not viewing each other as a threat because of their exclusive goals (the Decepticons want resources from Earth to help conquer Cybertron, Rita wants the Earth itself).
** Scorponok's [[RenegadeSplinterFaction rogue faction]] of Decepticons end up allying with the [[Literature/TheSagaOfSevenSuns Klikiss robots]] to make war against all organic life. [[spoiler: After Scorponok and the other main Decepticons are all killed, the remnants of the group are then taken over by [[Series/DoctorWho the Master]].]]
* ''Fanfic/RainbowDoubleDashsLunaverse:'' By the end of the first series, four corrupt politicians have teamed up to try and get the Element Bearers under their hooves - [[BigBad Greengrass]], Archduke Fisher, Puissance, and [[BigBadWannabe Blueblood]]. And by the time we see them working together, Puissance has inadervtantly removed herself from the team-up being distracted by shiny new technology. Meanwhile, Greengrass and Fisher are already trying to get Blueblood out of the way.
* ''Fanfic/AnEmpireOfIceAndFire'': After Daenerys only mutilates him instead of having him killed, an even more crazed Viserys makes his way to Westeros, where he happens to encounter Ramsay Bolton. The two quickly strike an alliance, with Ramsay supporting Viserys' attempts to claim the Iron Throne in exchange for Daenerys eventually being given to him as a forced bride; Walder Frey later gets in on this, offering his support in exchange for even more power in Viserys' regime. And true to this trope, Ramsay is quickly shown to be plotting to remove Viserys once he has Daenerys.
* In [[https://www.fimfiction.net/stories?q=luna+aeternal Luna Aeternal]] we have two genocidal terrorist groups representing humans and ponies trying to stop a pony/ human peace treaty. Despite the fact they fully intend to wipe out each others species they come very close to winning. The reason they get along so well is that both sides fully believe they will be in an advantageous position over the other when their alliance is over.
* Happens a lot in ''Fanfic/InfinityCrisis'':
** The first story has Thanos forming a "Masters of Evil" with [[spoiler: the Red Skull, Hela and Malektih.]]
** ''Of Kryptonians and Queens'' has Morgana recruit Etrigan to aid in her plans [[spoiler: and after being banished from Earth-38 she allies with Doctor Doom]].
** ''Powers and Marvels'' has Lord Zedd and Rita Repulsa joining with the Mandarian. The story's end has [[spoiler: a maimed Mandarian rescued by the High Evolutionary.]]
** ''Gamma Relations'' sees the Leader, Mr. Sinister and Otto Octavius joining in a scientific collective [[spoiler: bankrolled by Norman Osborn]].
** ''Sins, Sirens & Strife'' first has the Enchantress enslaving Bane to aid her. She then frees Circe from prison, and then the duo recruit Dr. Sivana, Mister Mind, Ibac and Black Adam to their cause.
** ''Counterpart Conferences'':
*** Chapter 2 has Hordak and Skeletor agree to bury the hatchet and renew their old partnership to conquer Third Earth, Eternia and Etheria.
*** The Ra's al Ghul of the DCAU Earth offers an alliance to his Earth-51 counterpart.
*** Chapter 5 has Cobra and the Decepticons entering into an alliance to conquer Earth for Cobra who will then give the Decepticons the Allspark to take over Cybertron.
*** The end of Chapter 8 sees [[spoiler: Fiona the Black Fairy making an offer of alliance to Morgana]].
** Subverted in ''Of Hand and Foot'' as the Foot, the Hand and the Kingpin are ready to go to war with each other.
** ''Justice Like Thunder'' reveals that the Thunderbolts' whole BoxedCrook setup is actually a con engineered by [[spoiler: Osborn and Mysterio, who are planning to also form the series' version of the Sinister Six.]]
** ''Brothers of Thunder'' has the Earth-8092 versions of Red Skull, Baron Von Strucker, and Baron Zemo putting aside their differences to reunite, and also ally with Loki, Malekith, and a Surtur-possessed Enchantress to [[spoiler:invade Asgard]]. It also turns out that Loki has a side deal with Dormammu that the others don't know about, to give the latter control of Earth.
** ''Tales of the Beyond'' has Gasket and Archerina teaming up with Vexus to build a New Machine Empire in Jimmy Neutron's universe. It's quickly made clear that both sides are plotting to betray each other as soon as they [[YouHaveOutlivedYourUsefulness outlive their usefulness]].
** ''Tomorrow's Guardians'' has Ultron taking over leadership of the Kaylon to wipe out all organics in the ''Orville'' universe.
* In ''Fanfic/JackieChanAdventuresOlympianJourney'', Vanessa Barone, Zhixin and Origami team up in the first chapter in order to get revenge on Jackie. And after [[BigBad Eris]] is released from her [[SealedEvilInACan imprisonment]], they're recruited to serve as [[QuirkyMinibossSquad her muscle]].
* In ''Fanfic/WithThisRingGreenLantern'', Star Sapphire -- possessed by her split personality the Predator -- and Hector Hammond join forces to destroy Hal Jordan. It isn't a cordial partnership, though.
* ''Fanfic/JWITCHSeason1'': In "Enter the Oni", [[WesternAnimation/JackieChanAdventures Tarakudo]] strikes up an alliance with [[WesternAnimation/{{WITCH}} Prince Phobos]], the deal being that in exchange for Phobos providing information on the Chans and the Guardians as well as lending out his minions to search for the Oni masks, Tarakudo will use his Shadowkhan armies to crush the Rebellion for Phobos and ensure his rule over Meridian.
* In ''ComicBook/{{Shazam}}'' fanfiction ''Fanfic/HereThereBeMonsters'', Dr. Sivana tracks down every villain fought by the Marvel Family to recruit them into his new super-villain team.
-->'''Dr. Sivana:''' "We've got a big job for you, Ibac. I'm putting the Monster Society back together again. This time, we're going to take those three little costumed trolls that have caused us so much grief over the years, and kill them. That's just for starters."\\
'''Ibac:''' (grinning) "Count me in."
