Times where someone teamed up with their enemy in Fan Works.
Crossover
- Initially averted in Avengers: Infinite Wars after Ultron's introduction sees him mount a wide scale attack on the Star Wars galaxy. Even with both the Confederacy and Republic recognizing the threat the genocidal A.I. poses, only a few individuals like Padme and Mina Bontari argue for a ceasefire between the two sides to focus on the common enemy, with Palpatine especially refusing to deviate from the Sith Plan. Only after the Citadel battle, where Ultron shows himself to be capable of assimilating both normal people and Force users, does his existence prove to be such a threat that Palpatine suggests to Dooku that both sides pursue a ceasefire, at least until Ultron has been destroyed.
- The Bridge (MLP): Monster X and the Sirens are forced to team up when Enjin shows up and tries to kill them all.
- Burning Black: Anti-Cosmo, and by proxy every anti-fairy he commands, allies with Team Turner against Remy and the Pixies in Act 3. He even outlaws the use of bad luck on Timothy directly; indirect bad luck is still fair game. The relationship is creeping into Friendly Enemy territory, which makes Cosmo and Wanda very nervous as Timmy's exposure to anti-fairies affects his personality and allows him to use black magic while giving him immunity to anti-magic waves.
- The Chaotic Three:
- After the betrayal of Darth Janus and the mass droid assault, the Republic forces on Naboo join forces with the surviving representatives of the Trade Federation, to the extent that Padme Amidala fights alongside Nute Gunray.
- At the same time, back on Coruscant, Mace Windu and Palpatine are forced to work together to fight back a wave of droids that are trying to kill them both, each recognising that they will both be killed by the droids unless they work together, although they continue their previous duel as soon as the droids have all been destroyed.
- This happens in the Naruto/Justice League crossover Connecting the Dots when Naruto and Sasuke team up against a REALLY big threat.
- A Dark Knight over Sin City features Batman and the anti-heroes from Sin City teaming up together and with other criminals in order to achieve their goals.
- Daily Equestria Life with Monster Girl: Equestria's most virulent unicorn-supremacist, pegasus-supremacist, and earth-pony-supremacist organizations all team up for the attack on the palace, because as much as the leaders and members of the three groups hate each other, they all hate centaurs even more.
- Dungeon Keeper Ami: Ami can't persuade the surface races that she became a Keeper by accident and is still loyal to the forces of Good. But she does manage to present a strong image of Pragmatic Villainy, which leads to working with them several times against greater threats such as Crowned Death's giant underwater temple.
- Earth's Alien History:
- Humanity and the Race first start to move from belligerents coexisting on the same planet to allies as a result of having to fight together against all the other alien invasions of Earth, most prominently against the Harvesters.
- The Mekon War is the first time two major separate power blocs (in this case, TeTO and the Citadel Council) work together against a common foe. The two then also fight alongside the Klingons and Romulans in the Five Galaxies War, and then all four factions work with each other and virtually every other faction in the Alpha Quadrant (even usually vilified races like the Harvesters, Vinn and Space Pirates) during the Reaper War.
- While not enemies, the Arks Sherran and Centus are from rival blocs (the former from TeTO, the latter from the Citadel) but have to work together to survive after the Scourge damages them, separates them from their respective fleets, and strands them in hostile Kett space.
- The Klingon and Romulan Arks left the Milky Way before the Reaper War led to their peoples putting aside their old rivalries, so still don't trust each other. But they work together to prevent Krell technology from falling into the wrong hands. As their definition of "wrong hands" include Ronan and Thanos, this alliance also brings in the Novans, who are desperate for any aid against their enemies.
- In the Mirror Universe, the Ferengi ally with TeTO against the Mekon, as his totalitarian regime is bad for business.
- Also in the Mirror Universe, the remnants of the Conspiracy of Light eventually ally with the Klingon-Andorian Alliance in order to check the growth of the Terran Empire.
- The Master proposes to the Legends that this will eventually be the case between them against Faction Paradox. As he points out, they all want the Faction defeated — the Legends' mission is to stop the Faction from distorting the timeline, and the Master's is to find the Doctor, who is hiding from the Faction — so it's only natural they team up. Time will tell if this happens.
- Following their second civil war, the Klingon Empire is divided into the democratic Klingon Republic and the reactionary Kahless Empire, which despise each other on ideological grounds. Despite this, they agree to work together in order to join TeTO's war against the Goa'uld, as they were the Klingons' original "gods", and the Klingons feel honor-bound to fight them.
- Towa and Mira join forces with the Legends after Lord Drakkon betrays them.
- The Conspiracy (as represented by Ash, Dawn, and Spock) and Torchwood (represented by Jaime Reyes) put aside their rivalry to work together against the Seth-controlled Syrannites on Vulcan, as the cult is a threat to TeTO's stability, and both organizations have the goal of protecting the alliance as a whole.
- At one point during WWII/the Race invasion, Torchwood worked with the Race to defeat HYDRA and retrieve the Tesseract, as it made them a threat to both sides. Of course, they turned on each other as soon as the mission was completed.
- Equestria Girls: Friendship Souls:
- WWI and WWII were some of the few times that the Soul Reapers and Quincy were able to put their own conflicts aside, for the most part at least, and focus on the Hollows born from all the people dying horrific deaths.
- Tirek has repeatedly offered to ally with Sombra and the Quincies against their mutual Soul Reaper enemies, but Sombra has always refused. Most of the Espada think that it's just a courtesy at this point and he doesn't really think that Sombra will take it. Guto is the only other Espada who doesn't want to wipe them out, but that's simply because he wants to conquer and enslave them instead.
- When the Kraken attacks the beach trying to get the magic in Indigo Zap's legs, the Humane 6, Twilight, and the Shadowbolts team up to fend it off.
- When Grogar sets his experimental subjects on Canterlot City as a distraction, Sweet Cider and her forces work together with Filthy Rich and Soarin to defend the citizens.
- Starswirl works together with Twilight, Cadence, Filthy Rich, and Soarin to defeat Sapphire Shores.
- The Equestrian Wind Mage:
- The denizens of Sunnytown — minus Grey Hoof and the Bone Fiends, who are working with Ganondorf — ally with the Mane Six and Vaati in order to retrieve the Element of Honesty.
- The fact that Ganon is oppressing everyone in Equestria leads to alliances with the Diamond Dogs and Changelings against him.
- In Season 3, the above alliances are still in effect, and with the monsters reformed, this will undoubtedly happen as contact between Equestria and Hyrule is made in the wake of Majora's attack.
- In Fractured (SovereignGFC), a Mass Effect/Star Wars/Borderlands crossover and its sequel Origins, this is attempted several times. Whether it works is another matter.
- Unlike canon, Samantha Shepard is not able to pull this off with the whole galaxy when the Reapers arrive, thanks to a Technology Uplift gone wrong that causes existing tensions to get worse rather than fade away in the face of a common foe.
- The Citadel Council attempts to manage this through Aria T'Loak in the Terminus by having her unite the various mercenary factions to fight Flood. It works in that the mercenaries cooperate, but their efforts fall flat.
- Garrus Vakarian tries to accomplish this by causing an arms race in the Corporate Warfare taking place around him, but it fails on two fronts: the corporations distrust each other and there aren't enough resources for this to work even if they did.
- The heroes tend to view Sarah this way initially—she did kill millions of people even if it was for a good reason. Flood invasions are generally bad.
- Guardians, Wizards, and Kung-Fu Fighters:
- After the Sack of Torus Filney exposes the dark side of the Rebellion, Will convinces Caleb and the other disgusted members of the leadership to seek a less violent path to victory by allying with members of Meridian's nobility who are opposed to Phobos' tyranny, in order to ease their campaigns going forward.
- The Tracker and Nimue both have vastly different goals, but are willing to work together to destroy the Oni.
- In Chapter 32, the Rebellion and Guard team up against the transformed Whisperers (and Phobos, by extension, who has decided he doesn't need the Guard anymore).
- Freedom Fighters (Sonic x Freedom Planet): After being sent to Avalice, Eggman proposes to Sonic's team to not start any conflicts until they find a way back home. Reluctantly, the group accepts, and the two sides now begrudgingly work together.
- Political example in Harry and the Shipgirls: With the Abyssal War leaving the Statute of Secrecy on borrowed time, Lucius Malfoy works behind the scenes with Albus Dumbledore, Arthur Weasley, Amelia Bones, and Augusta Longbottom to help minimize damage from the fallout.
- In Honey and Vinegar, years prior to the start of the story, Seras teamed up with the then Belmonts active at the time to defeat all of Godbrand's invading forces because she didn't want them in her territory.
- In The Institute Saga, Juggernaut helps Superman and the X-Men to prevent Magneto's plans from ending Humanity.
- Ladybug in a Half Shell: Donatello and Casey momentarily put their animosity aside when they see April talking with Adrien."That boy that April is talking too is Adrien Agreste. He's a top fashion model in Paris who's father also creates one of the top fashion lines in the world." There was a slight pause while Casey registered what Donnie had just said. To Donetello it seemed to take forever so he decided to stream line it for the boy. "Our April is talking to a famous rich fashion model from the city of Love."
- Metal Gear: Green: To combat Outer Heaven and the MSF, Madam President offers all the weapons, equipment and whatnot to the African Warlords in exchange for slaughtering all of the MSF and Outer Heaven. This often devolves into Enemy Civil War at times as their needs differ from one another, but as Madam President knows, the warlords will have to work together, or they will die.
- In My Huntsman Academia, Izuku and Katsuki use Neo as their source of info on the White Fang to foil one of its robberies. Later on, they work together to fend off the waves of Grimm attracted by Katsuki's Hair-Trigger Temper.
- Happens all the time across all faction and races in The New Age of Monsters
- In a particular notable instance, Gigan's appearance in chapter 10 turns what was about to be a three way brawl between Finè, Jishin-Mushi and the united forces of SONG, Eva-00 and Striker Eureka into a Curb-Stomp Battle with it on the receiving side after every single faction changes priorities and targets him instead.
- On a larger scale, conflicts between different countries have become almost nonexistent since the kaiju present a common threat to all of humanity. Most superpowers have greatly reduced their nuclear arsenal and some even say that the emergence of kaiju prevented World War 3.
- Out of the Corner of the Eye:
- Shendu allies with Jackie and the others against the Outer Gods/Old Ones. As he puts it, he gets revenge for what was done to his son, and eliminates potential competition, while the Chans get to protect their world, so everyone wins.
- The Chans and Section 13 fight alongside Po Kong against the Shoggoth. Po Kong betrays them by trying to steal the Shoggoth's power, but gets exorcised for her troubles.
- Subverted in Risk It All. The Triads seem unusually open to fighting with Ren rather than against him, to the point that one unnamed crook is baffled when Ren pounces on him for shooting another guy dead. Ren knows that allying himself with the Triads would make achieving his vendetta against Black Mask easier, but he refuses to work with criminals who thoughtlessly kill people.
- The Secret Return of Alex Mack: The alien organism in the "Mission" arc is so that dangerous that by Maggie Walsh's order, a captured Collective agent cooperates with the SRI to contain it. After all, if the Earth gets completely depopulated, everyone loses.
- A Shadow of the Titans: Jinx briefly teams up with the Titans after Mumbo captures both Jade and Starfire and forces them to be his "assistants". Jinx describes it as "sharing a mutual problem", and as soon as Mumbo is defeated she grabs Jade and runs off.
- The possible Bad Future glimpsed in the "Destiny" interlude has another apparent example: whatever "Omega" is, it's so bad that the Demon Sorcerers and the Eight Immortals team up with each other and Good!Jade to stop Evil!Jade from releasing it.
- Jade and Raven teaming up against the Master of Games.
- At the end of the first arc, the Titans team up with the HIVE honor roll and Gadjo in order to defeat Tarakudo and his Generals, who have taken over the HIVE and are using it as a staging point for world domination.
- Son of the Seven Kingdoms:
- Serana aids the Dawnguard in fighting other vampires.
- When the Mythic Dawn opens an Oblivion Gate during the Battle of King's Landing, William's Legions and the Lannister-Tyrell alliance quickly call a ceasefire and work together to stop the monsters emerging from it.
- Star Wars vs Warhammer 40K: Invoked and Subverted. After provoking a war with the Invading Refugees from the Imperium's Xek-Tek Sector, Palpatine decides to end the Clone Wars by arranging for the Republic and Confederacy to agree to a ceasefire and mutual alliance in the face of this third, mutually hostile threat. However, despite the Sith's best efforts, neither side is willing to extend a hand. After years of stoking the flames of war, Palpatine has ironically made it so that any talk of "allying with the Separatist animals" gets shut down by the Galactic Senate's warhawks. At the same time, the Separatist Parliament laughed out Count Dooku for proposing a temporary alliance with the Republic, still confident that they can overcome both their old and new enemies. The latter pays for their arrogance with their lives when the Crimson Razors Chapter launches a crusade through Separatist space, wiping out their fleets and even destroying many of their planets, including their capital of Raxus Secundus.
- Superwomen of Eva 2: Lone Heir of Krypton: The first time that Asuka and Rei are on the same battlefield is during the Brainiac crisis. The first time they have to work together is when Parasite kidnaps them both to use as "power chargers". Asuka finds a lot of respect for Wonder Girl on that day-time will tell if they become Fire-Forged Friends.
- Thousand Shinji:
- Discussed. Asuka suggests that she and Rei should team up (because Shinji enjoys annoying Asuka and Rei likes annoying Shinji), citing the "The enemy of my enemy is my friend" sentence. Rei gets surprised because Shinji has a different version: "The enemy of my enemy dies next."
- Nothing less than an overwhelmingly bad situation could possibly force the Warhammer 40,000 gods to work together. We're talking a reluctant agnostic/atheist turned God-Emperor of Man, the Four Ruinous Powers (who are sufficiently powerful that the only reason they haven't taken over the world is because they A) HATE each other, B) like it just the way it is, and C) already have...), Gork & Mork (the deities of a bunch of genetically engineered fungal bio-weapons), and the Eldar Pantheon (and let's not talk about everything they got up to with each other!).
- Violence in the Library: Post-Bespin, Darth Vader saves Luke Skywalker from the Xenomorphs, and the two team up to destroy them.
- Wonderful (Mazinja): L33t went so mad when he realized that Squealer stole his tech and made it work that he and his partner-in-crime Uber fed information to the heroes to help them to beat up Squealer's gang.
- Zero Context: Taking Out the Trash features the respective heads of The Brotherhood and The Forces of Nature joining forces to eliminate a corporate sleazeball that they both hate for their own reasons: Missy Coco because said sleaze's resources are on par with her own, and Viridi because he exemplifies everything that she sees wrong with humanity. The alliance lasts long enough to get things done, though not without plenty of infighting.
- All Assorted Animorphs AUs: In "What if they were in a time loop?", Jake ends up allying with Tom's Yeerk, named Ardek, who's stuck in the time loop with him, because they're both lonely and want to find a way to escape it.
- In What Tomorrow Brings, Marco makes a deal with Visser One to borrow one of her ships and use it to take out Visser Three, their common enemy.
- In Agent Carter: Phantom Pain, Michael and Emily and company convince Dottie to assist them because both parties are invested in shutting down HYDRA in the States, albeit for different reasons - Dottie to get back in the USSR's good graces, the Invaders because it's their job to stop fascism.
- Subverted in Run At The Cup. While Vi and Caitlyn being on the same team seems like this, their actual relationship, while not what anyone would call "friendly" is a lot less hostile (and a lot more steamy), so they don't have much trouble working together.
- In Eternal Life
, after Rampage and the corrupted Dinobot kill most of the other Maximals and Predacons, Tarantulas helps the remaining Maximals- Optimus, Cheetor and Rattrap- find a way to stop Rampage (Waspinator also survives, but obviously he wasn’t much help to their efforts and just chose to stay out of the way).
- In Hogyoku ex Machina, Yoruichi is surprised when she finds out that the Vizards fought alongside Soul Society against Aizen in the original timeline, since they have no reason to like them. Ishida suggests it was because of this trope.
- Dr. Brainstorm tries to defy this twice in Calvin & Hobbes: The Series. Both times, he ends up playing it straight.
- Under the Bridge: Widget has taken several attempts at killing Gadget. Now Chip calls her on her submarine Albacore on the radio, alerting her that Gadget is out to attack and sink Albacore with a self-made, air-dropped torpedo. But the call comes in time: A young squirrel from Widget's crew named Andy injured an ankle on an unprotected chain, and now Widget needs Gadget and her aircraft to take him to a hospital. Meanwhile, when Widget comforts Andy, this also helps trigger her Heel–Face Turn.
- In Carpetbaggers, when the newly-crowned Pevensies need backup to fight a horde of the Witch's creatures, they recruit the rebels who were holed up in the castle bullying and blackmailing local Narnians.
- Danganronpa: Komm Susser Tod: Chapter 3 is outright titled "My Enemy's Enemy", and the Class Trial involves Reiji Suzuki having to team up with Sasuke Akechi, who has been antagonizing him and the others since the beginning, to catch the killer.
- In Angel of the Bat, Stephanie/Spoiler struggles to bring Red Hood to her cause of saving Cassie because it will mean they will be closer to bringing down their mutual enemy The Seraphim. It doesn't work at first. Batman eventually breaks Jason's resistance personally.
- “Crisis of Infinite Batgirls” opens with Stephanie Brown being sent back in time to track a mysterious villain who is trying to destroy the legacy of the Bat-Family, which results in her joining forces with Cassandra Cain (just at the point she was contemplating quitting as Batgirl) and then going back to when Barbara was still active as Batgirl Cass and Steph finding Barbara just as she’s captured the Joker. The Joker soon reveals that he was contacted by the villain they’re seeking to distract the Batgirls, but the three convince the Joker to help them find their enemy by pointing out that the villain’s final goal is to kill Batman in his crib, and Joker would never even exist without the Dark Knight. The clown actually stops smiling at this observation, conceding that there’s no comedy in his own existence if there’s no Batman for him to oppose.
- Almost the entirety of Batman's Rogues Gallery team up with Tim and Barbara in A Little Less Conversation, a Little More Action Please to fight off the Imperium Invasion.
- A later chapter shows Static Shock teaming up with all the Bang Babies in the city to do the same.
- In Hellsister Trilogy, Lex Luthor and Captain Marvel's nemesis Dr. Sivana are so scared of Darkseid they end up cooperating with the heroes.
- In the Crack Fic All You Need Is Love Light seeks help from L and Naomi Misora after "misplacing" a Death Note.
- In A Cure for Love Light/Kira considers L to be his "partner" in destroying the Astraea Organization at first, before he usurps control of their organization.
- In Survival of a Monster the 11th Doctor, Norine and a Rutan form an alliance to stop King Wurzin and the Tufgup learning space travel with a Rutan ship.
- From the same author, Game of Doctors has a lot of this as the 7th Doctor in the 8th chapter is forced to make an alliance with Callidus Dominus and the Malphan Empire to defeat the Virmok Empire. Later with the help of the 11th Doctor he gets the Daleks to attack the Master's Cyberman world in the 16th chapter, which makes the 9th Doctor furious.
- From the same author, Game of Doctors has a lot of this as the 7th Doctor in the 8th chapter
- The plot of Frigid Future is this. Cooler tries to avenge Frieza's death, only to find Goku and the other Z Fighters have been killed by the androids. Thus, Cooler must from an alliance with the forces of Earth to get his revenge.
- In Never Had a Friend Like Me, the
Pixies and the Anti-Fairies have mutually exclusive goals for the world. They have, however, teamed up together temporarily in order to remove an obstacle to both their plans: Timmy Turner.- Later, they join Norm, Timmy, and his fairies in trapping Bob in another dimension.
- In Fire Emblem: Three Houses: Fifth Path Byleth essentially bribes/blackmails Jeritza aka the Death Knight, one of her most dangerous enemies, into protecting Flayn. Seteth is baffled by how this works.
- Enemy of My Enemy: Exactly What It Says on the Tin, and awesome. Take a UNSC colony and add one shipload of Elites being chased by one carrier full of Brutes...
- If There Are Wolves Among The Stars:The starship Long Night of Solace has been cast adrift, partially intact, in slipspace, and the one Spartan and one Sangheili aboard both have reasons to get back to Reach...
- Most stories focusing on Slytherin (particularly Slytherin!Harry) will give the House a simple rule that any problems with housemates stays inside the House. Against the other three Houses, they show a united front regardless of their feelings towards one another.
- Unlike canon, even the Slytherins in Dark Defense hate Umbridge and want her gone. During his OWLs, Harry ponders whether the truce between Slytherins and Gryffindors, especially himself and Draco, will continue once she's gone.
- Harriett Potter doesn't get along with Tom Riddle in The Rigel Black Chronicles, but she's willing to work with him to stop the Diary construct calling itself Voldemort and espousing a campaign of violent terrorism, in contrast to Riddle's political machinations.
- In Sluagh, apparently a Wizard Big Bad is exactly what's needed to get the Real IRA and the Unionist militia to work together.
- A Snake Named Voldemort has this between Voldemort and Harry, initially at least.
- In A Year Too Soon, basically every Slytherin takes Harry's side over Draco's. While several don't like Harry despite him being one of them, but they acknowledge that he does his best to help the house while Draco is a spoiled brat who thinks throwing his father's name around will get him anything he wants.
- Pansy's family announces their willingness to help Hermione press charges after she's injured by the Troll because whoever did it once could do so again, and Pansy's father will do anything to protect his little girl.
- In A Thing of Vikings, despite wanting to wipe each other out, various Eirish and Viking Kings work together in a cooridinated attack on Berk and its territories. They make it clear to each other that once they defeat Berk things amoung them will go back to buisness as usual.
- In The Bonds of Blood from The Victors Project Series, the District 11 victors (all of them closet rebels) are forced to cooperate with the Capitol (using their knowledge of the local tunnels and such) when a third Reaver's not allied with either the Rebellion or the Capitol are attacking the District and trying to enslave it.
- Fall Into The River also from The Victors Project universe has Cecelia and the girl from District 4 having to form one of these in order to kill The Boy from District 2. They actually do become Fire-Forged Friends in the process, but given the nature of the Hunger Games that isn't enough to starve off the Inevitable Mutual Betrayal once he's dead.
- In These Are The Names by fernwithy, we have an interesting case of this where a career Tribute ends up traveling with three non-careers including Johanna Mason, for a while not due to an actual human enemy, but because The Plague is in the arena and they're too sick to fight each other at first.
- Becoming a True Invader: Zim is forced to ask for Dib's help in his campaign to conquer the Irken Empire in revenge, because with his own ship destroyed by the Tallest, he needs to use the Dibship, which only Dib can convince to help. In turn, Dib goes along with Zim's plans because fighting the other Irkens lets him play the hero on a universal level.
- In For the Glory of Irk, the Tallest are forced to work with the Syndicate and Zim's exile group on Earth after they're sent on the run by the Control Brains.
- Invader Zim: A Bad Thing Never Ends:
- In Chapter 15, after MiMi, Minimoose and the Minion Trio are transported to a deserted island in a teleporter accident, Zim and Tak reluctantly team up to find them before Lex does — Tak wants MiMi back, knows how to find her, and doesn't trust Lex to retrieve her (despite their alliance), but needs a ship to travel to the island, while Zim has a ship and wants to retrieve Minimoose (he's ambivalent about his other minions), but doesn't know how to find him. So, the two call a temporary truce until they can get to the island and locate their respective robots.
- At the end of Chapter 18, after Tak's alliance with Lex breaks down, Zim offers that they work together against him, as he's now an enemy to them both. The Membrane faction ends up getting in on this alliance as well in Chapter 19 when they ask for help against Aldrich Coathanger, leading to an arrangement wherein the three teams' resources are divided up to take out both enemies simultaneously.
- My Hostage, Not Yours:
- The New Adventures of Invader Zim has this happen quite a few times:
- Season 1:
- In Episode 3, Dib and Tak team up to fight off Norlock when he shows up to kill her, with Dib deciding Tak is the Lesser of Two Evils. However, Tak makes it clear that they are not Fire-Forged Friends because of it.
- In Episode 11, when Zim's latest experiment (genetically engineered plant monsters) turn on him, he has to ally with Dib's Team Save Earth to destroy them. Tak shows up partway through the fight to aid them, just because she sees the plants as a threat too.
- In Episode 13, Zim and Skoodge team up with Tak to rescue Tenn from CREAM. Lampshaded by Tak quoting the Trope Namer, when Norlock points out that they don't have to like each other to get it done.
- In Episode 15, we see Dib, Zim, and Tak's groups all reluctantly teaming up to fight the sea hydra that attacks them.
- In Episode 21, all three teams ally against Norlock, who has betrayed Zim to take Project Domination for himself.
- Season 2:
- In Episode 7, the three teams call a truce after being sent into a Mirror Universe, so that they can figure out how to get back to their own reality. Later, they outright team up to stop Dib and the twins' evil counterparts from destroying both universes in an attempt to create their own.
- In Episode 11, Tenn and Skoodge briefly put aside the fact that they're on rival teams in order to work together against Invader Larb, who both of them despise.
- Downplayed in Episode 12, where Team Save Earth and the two Irken teams all end up Trapped in TV Land and reluctantly work together to escape back to reality, before eventually fighting together against Dqxagnmklormoc (aka Dave the Scary Monkey) when they stumble on his realm and he tries to kill them all.
- In Episode 13, since the Nightmare Weaver's Mental World can only be escaped if everyone it's trapped is broken free of their nightmares, the three teams reluctantly work together to fight it.
- Season 1:
- Ruby Pair:
- In "Beefus Megabombus", the Irkens are forced to ask Dib and Gaz for help fighting the pirate bees, because with their base incapacitated, the Membranes possess the only other technology on the planet (namely Tak's Ship) which can fight back properly.
- In "Gaols & Ghouls", the Irkens and the Membrane siblings get sucked into the titular game and have to team up to beat its quest so that they can be returned to their own world.
- Top of the Line (Editor-Bug):
- During the climax of The Rematch, Zim and Tak (and by extension Skoodge and Tenn) have to put aside their differences to escape from Space Case.
- Similarly, during the climax of The Remedy, the four team up against Tak's bigoted boss Erbium, when he decides to melt them all down just because he doesn't like Irkens.
- Jackie Chan Adventures: Olympian Journey: At the climax of the Poseidon arc, the J-Team and the Agents of Chaos have to team up to defeat the Six-Eared Macaque after he gains Poseidon's essence and goes on a rampage with it. It's lampshaded by both Jade and Eris, and the two sides immediately turn on each other when the chance to get ahold of the essence comes around.
- Queen of All Oni:
- When Valmont uses the power of Kaito's mask to steal the Ninja tribe away from Jade, she and Jackie briefly (and reluctantly, in her case) team up to defeat him.
- Subverted in one of the scenes set in Jade's mindscape — Hero tries to form an alliance against The Queen with his apparent rival Father, but is rejected.
- In a similar subversion, the J-Team refuses to ally with Karasu against Drago, as they don't see any good coming from working with a Shadowkhan.
- The Ultimate Evil:
- After Jade's trapped in the Netherworld, Valerie goes to bargain the Pan'Ku Box from Shendu, resulting in the J-Team having to travel with the Demon Sorcerer and Hak Foo to the Fire Demon's portal so that Shendu can use the power boost provided by his Other Valerie to keep the portal open long enough for Jade to escape. Shendu's then banished before any of his siblings can escape as well.
- When the damaging of the Book of Ages creates an all-consuming vortex during the climax, Shendu sets aside his animosities with the heroes in order to bring Valerie to the Book so that she can fix it.
- In the sequel, The Stronger Evil, Drago ends up accidentally releasing Tarakudo from his imprisonment and has to team up with the J-Team to put him back down. Eventually Valerie proposes a full team-up with Drago and Shendu. Only Nataline of all the members of the J-Team agrees to it at all.
- When Shendu is released and takes Valerie with him, the J-Team and Drago reluctantly form an uneasy truce to make sure Shendu isn't doing anything bad to Valerie.
- Webwork: The Mexican crime boss known as the Old Colonel convinces the J-Team to protect him from the Oni Essence-empowered Chang and help take him down, by pointing out that it's better than letting Chang kill him, take over his assets, and go to ground with it all. They do help, but set the Colonel to be arrested by the Mexican police.
- In Chapter 4 of Ripples in Venice, Trish runs into Risotto Nero, the leader of the hitman team who fought and died against the heroes in their efforts to capture Trish and use her to get to the Boss of Passione. However, Trish tells Risotto that the Boss is now trying to kill her and Buccaratti's team, and she convinces him to help them against the Boss. Risotto accepts and even fights alongside her against Cioccolata and Secco.
- In The Legend of Zelda: Ocarina of Time, Link pulls one with a Dinolfos to take down an Iron Knuckle that the latter accidentally provoked.
- In Good Old Day, when Peter learns about his deal with Mephisto and the loss of the daughter he and Mary Jane would have had, he goes so far as to call in his old favour from Loki to help undo it. Mephisto attempts to oppose this effort by contacting Norman Osborn for assistance, but after Osborn rallies the forces of the Cabal against the heroes aiding Spider-Man, when Doctor Doom learns that the Cabal is helping Mephisto, he immediately turns on his fellow villains to oppose Mephisto’s efforts due to Doom still being angry at Mephisto’s treatment of his mother’s spirit (also noting that he owes Spider-Man a favour for thwarting a past assassination attempt).
- In Tony Stark is Not a Supervillain, the rogue Avengers try to handle a hostage situation in Israel, despite having no knowledge of the actual situation, only for both the hostage takers and the hostages to team up against them due to a common "objection to Rogers and his brand of stupidity". Loki and Dr. Doom find the idea hilarious.
- One issue of Ultimate Spider-Woman: Change With the Light has petty criminal Blizzard teaming up with Spider-Woman to help her protect the innocent people in danger during an invasion of New York City by an army of Brainwashed and Crazy super villains. Taking inspiration from the Darkwing Duck episode where DW teamed up with Megavolt (see below), Blizzard points out that if New York is destroyed, there'll be nothing left for him to rob.
- In The True Villain, Papillion akumatizes a man with the promise to help get back his "products" in exchange for taking the Ladybug and Black Cat Miraculouses. He soon realizes that his new akuma is actually a human trafficker who kidnaps Marinette and plans to capture Adrien to sell them both. Horrified at the discovery, Papillion reaches out to Chat Noir to work together to defeat the traffickers and rescue Marinette.
- Mortal Kombat Khronicles has Chow (Lui Kang's brother) and Kojin (Earth's fire god) find the Kollector, while infiltrating the Kytinn hive on Shang Tsung's now-abandoned island, hiding out and stranded in the depths of the island. Despite their opposing allegiances, he agrees to help them in their quest, and they part on surprisingly good terms.
- In Fairy Tales and Hokum, the agents who remained behind in Big Bad Hamilton's camp are captured by a team of Medjai, but when Anubis' Army closes in on them, they volunteer to help the Medjai fight the undead army.
- In Fear No Evil, All Might and All for One reluctantly find themselves working together with Eraserhead acting as their mediator as all three work together to rescue Izuku Midoriya from Humarise.
My Little Pony: Friendship Is Magic
- A Brief History of Equestria: When Wind Whistler led a coup against Commander Sullamander, she recruited help from Star-Swirl the Bearded and the few unicorns loyal to him. True, Star-Swirl was open-minded and friendly with the other tribes, but that's still members of one nation asking help from members of a rival nation to overthrow their leader.
- In The Conversion Bureau: Cold War the United States of America and the Soviet Union put aside all differences to fight a xenocidal race of Ponies.
- The Ending of the End - Love and Tolerance Edition: When the rematch between Princess Twilight and friends and the Legion of Doom (then made up of Lord Tirek, Chrysalis, and Cozy Glow, though Mean Twilight and Sombra would join their roster afterwards) is interrupted by Grogar blowing up Canterlot and releasing the Wendigos, the villains realize that he will not leave an Equestria left for them to rule if he wins. And offer a truce to their enemies to fight a common enemy. Which lasts the rest of the story.
- Escape from the Moon: After the peace treaty between the "Pures" and the group rebelling against them was signed, Spliced Genome continued to create the plagues she'd used against the Pures on behalf of the rebels. Both sides promptly teamed up to capture her and lock her up.
- The Immortal Game: In a plan born of desperation to defeat Titan during the Final Battle, the Mane Six end up allying with Discord. As Celestia puts it, they know the latter will probably betray them after they're done with Titan, but they can handle that, and besides, "better the devil you know".
- Loved and Lost: After Jewelius reveals his true colors to her, Twilight ends up inadvertently working with Queen Chrysalis to take him down. The latter reveals that she had one of her Changeling scouts (disguised as Raven Inkwell, help Twilight rescue her parents and escape Canterlot with the Elements of Harmony. Ultimately, this turns out to be a ploy so that Queen Chrysalis can exact revenge on Jewelius for betraying her.
- Luna Aeternal has Twilight, Princess Luna and several others trying to stop a terrorist group composed of humans and ponies who want to eradicate the other species from restarting war between ponies and humans. Ironically, the terrorist group is very effective at working together, partly because both sides think themselves exploiting the other.
- The Powers of Harmony: After she possesses her, Eclipse is able to convince Rarity to help her plot against Cetus, and together they plan to bring Twilight into the fold as well. Or at least, that's what Rarity wants Eclipse to think.
- Played straight when the Changeling Princess Pupa allies with Applejack's group to stop (her sister) Chrysalis' invasion of Gildesdale, with the promise that afterwards she'll also ally her people with the ponies against Cetus.
- At the climax of Rolling in Beaches, Spike convinces the hippocampi and Scaly Back River Clan dragons to put aside their differences in order to stop all the dragons and Mane Six turned into monsters by the Rainbow of Darkness.
- In the Pony POV Series, the backstory for the Dark World has this happening twice between Discord and the various La Résistance groups arrayed against him (primarily the Changelings) — first during the invasion by the Imperium of Man, then centuries later during his war with Grogar (in both cases, Discord was viewed as the Lesser of Two Evils).
- Clover's story in the 7 Dreams/Nightmares collection reveals that eons ago, a group of Eldritch Abominations escaped the loss of their own reality by entering the POV multiverse with the intention of absorbing all beings into their Hive Mind in order to torment them for all eternity. This offended both Fauna Luster and Entropy — the former because She's a strong believer in free will, and the latter because it would potentially prevent the end of all things She embodies and desires — leading to Them, Their Mates, and Their respective children working together to defeat these things and seal them beyond the Gates of Tartarus. It's noted in-universe that this is the only time the two of Them have ever agreed on anything.
- During the Wedding Arc, while they're unaware of it, the heroes' efforts are being aided from the sidelines by Discord and Nightmare Diamond, who are aware that if Chrysalis succeeds in her plans, she'll be powerful enough to be a threat even to them.
- During the Finale Arc, when Discord and his allies begin their endgame plan, it's so horrifying that a group of alternate dimension Nightmares show up to help stop them.
- Boutoku no Naruto has Kyuubi willing to help Naruto out of hatred for the shinigami. When Naruto learned Edo Tensai instead of Kage Bunshin, Kyuubi offered him a deal.Kyuubi: "Because I hate. There are many things I hate. The Sage of the Six Paths. Madara Uchiha. Hashirama Senju. Mito Uzumaki. Minato Namikaze. The toads. Kushina Uzumaki. But more than anything else, I hate the Shinigami. He stole over two thirds of my power, and claimed the Namikize's soul in return, a violation of his own laws and rights. The Shiki Fuin, the contract with the Shinigami, works on a simple basis. A soul for a soul. He did not take my soul, merely my power. When I was sealed, he had nothing to do with it. By the ancient laws, he should have let the Namikaze go, or at least send him to the Pure World, and return my power to me. But he didn't, breaking ancient law. ... You see, he has stolen from me, so I will ensure that he suffers for it! You Naruto, are the key of my vengeance. Through you I will make him suffer. All I ask is that you call back many, many souls, I don't even care for what, and in return, I will give you what all other jinchuuriki can only dream of, my full support."
- In Eroninja, Danzou and Joseki work together to destroy the Suna/Konoha alliance, viewing it as weakening their villages in the long run. Also, if they can instigate a war between the two, they'll have a chance to try and kill each other for their actions in previous wars.
- Several stories, such as Genjutsu Gone Right, explain that the point of D-Rank missions is primarily to unite a genin team... against their teacher for making them do glorified chores.
- Deconstructed in The Pride. While the five major villages did team up to fight against The End of the World as We Know It, all their grievances with one another still exist. Once Naruto's no longer running around trying to make sure everyone stays friends, the relationship between villages, especially between major nations and minor ones, deteriorates until the continent is once again engulfed in war.
- Son of the Sannin has multiple cases of this during the story proper, though two large scale examples play a role in the series' backstory:
- During the Warring States period, the Senju and Uchiha briefly put aside their centuries long fued in order to wipe out the Sutoku clan out of fear of their Plasma Release bloodline limit. It's noted in the narration that they learned exactly nothing from this and went right back to killing each other as soon as the last Sutoku was dead.
- During the Second Ninja War, the leader of Uzushiogakure, Kuniotoko Uzumaki, took advantage of a dispute between Kumo and Kiri, declared himself Uzukage, and tried invading Kiri to replace it as a Great Village, despite Konoha's warnings. The act was so egregious and insulting that Kumo and Kiri buried the hatchet and not only repelled the invasion, but counter-invaded Uzushio and crushed it to the last man.
- True Potential: Upon learning from Itachi of Akatsuki's attack on Kumo during the Chūnin Exams, Jiraiya tries to convince the Raikage that, even if an alliance won't happen, at least they should work together in order to fight this threat.
- Advice and Trust: Shinji's female classmates have a crush on him and team up to keep Asuka away him as each one of them try to ask him out. However Rei does not care for them trying to flirt with Shinji so that Rei teams up with Asuka to keep them away Shinji (and in the process they become good friends).
- HERZ: The US Government and SEELE does not like or trust each other, but they join to destroy secret organization GEIST. On the other hand, GEIST lends its support to NERV's successor HERZ to take down SEELE.
- Once More With Feeling (Crazy-88): Neither Gendo nor SEELE can stand each other, but they're working together until all Angels are defeated.Their investigations had uncovered that there was some kind of friction between SEELE and their point man at Central. As far as Kaji had understood and explained it, the goals of SEELE and Gendo meshed well until some undetermined point in the future, at which point... things would probably happen.
Both sides pretended it wasn't the case, but both sides knew the truth and were constantly maneuvering for position even as they worked together closely on what they needed to cooperate on.
- A Crew for a King:
- After learning of Baroque Works' plans from interrogating the captive Mr. 3, Mr. 5 and Miss Valentine, Smoker and Tashigi reluctantly agree to work with the Straw Hats to stop Crocodile.
- When Baroque Works' conspiracy is exposed, the rebel and royal armies team up to fight them.
- This Bites!:
- In chapter 19, Cross (a pirate) and Tashigi (a marine) both team up to fight Mr. 3 after he uses his wax to kill off numerous marines and civilians in Rainbase.
- In Part 3 of Impel Downfall, it's noted by Bentham and Ivankov that Byrnndi World was considered such a threat that pirates, Marines, and Revolutionaries all contributed to have him locked away—and this was decades before anything like the SBS existed!
- Pokémon Reset Bloodlines features a few examples of this:
- During the Bloodline War in the Bad Future, Ash apparently teamed up with Belladonna against the Bloodline King. Privately, Present!Ash wonders what circumstances would make such an alliance desirable for him, given how terrified of her he is.
- In the Black Rose Tournament Interlude, Marilyn Flame proposes to Ninja Riot a truce should a battle break out, and he reluctantly agrees.
- In the Wicke & Nephew Interlude, Betty Snyder, a trainer, and Zilant, a Ranger, though they aren't exactly working together, manage to stop a Palossand, despite their personal animosity over coming from nations that are at odds with one another.
- In the Steven Interlude, the title character has to convince the Draconids to agree to a truce to stop Team Zenith, after they steal from both of them some artifacts that could potentially destroy Hoenn and the world.
- In Chapter 33 of the main story, Ash's female companions run into Belladonna and company while looking for him. After explaining the situation, Belladonna invites herself to go along to help them find him, despite Misty and Iris not trusting her after their previous encounter, simply because Ash is her brother and she'd do anything to help him.
- Villain example: Although Brox and Co. and the Raleka in With Strings Attached aren't exactly mortal enemies, they dislike each other considerably. Brox and Co. are contemptuous of Ketafans in general, and the Raleka hate that the skahs want to use the sacred Vasyn for stupid purposes. However, they work together against the four because the Raleka cannot do certain things without Brox's help. We find out later that Brox and Co. were planning to betray the Raleka, but Paul and George inadvertently screwed this up for them.
- In Burning Coals, Yang and Neo team up against Cinder, an enemy they have in common.
- In A New World on her Shoulders, the White Fang and the SDC stop fighting against each other when the Leviathan appears, having a common enemy in the Kaiju-sized Grimm.
She-Ra and the Princesses of Power
- Zig-Zagged in Cat-Ra. Shadow Weaver tries to invoke this with The Rebellon when she escapes to Bright Moon at the start of the third season. When she first appears to Catra, the magicat just tries to kill her on the grounds that the woman was the cause of her abusive childhood. She stops when Shadow Weaver is finally able to get a word in and explain why sought out her out... only for Catra to become amused at the thought that she's the sorceress' last resort before redoubling her efforts. Ultimately, she's stopped from carrying out the deed by the others, and once Catra calms down the next day, everyone begins to earnestly accept whatever intel and advice Shadow Weaver has.
- Chasing Dragons: The Golden Company (descendants of the Blackfyre rebellions) and the Dragon Company/Exile Company (primarily composed of The Remnant of the Targaryen loyalists) put aside their historical animosity and work together to survive the political viper's nest that is Volantis.
- "Flaihhsam s'Spahkh": Spock casts the Romulans giving the Federation a cloaking device for the USS Defiant as an alliance against a poorly understood enemy (the Dominion). The alliance had collapsed by the time the Dominion War broke out.
- In "Past Continuous", as in canon the Federation and the Klingons are technically still at war throughout the 2800 incident (though active hostilities have died down), but they're working together to eject Loriss from Deep Space 9. Eleya remarks to Kagran that after the Jem'Hadar are dealt with "we can go back to hating each other, but until then, I want your word you'll keep [[http://sto.gamepedia.com/K'men K'men's]] people in line."
- Peace Forged in Fire: Praetor Velal of the Romulan Star Empire becomes disgusted at the underhanded attempts of the Tal'Shiar to disrupt the peace talks between the Empire and the Romulan Republic, and joins with his opposite numbers to take them down. During the talks they also prepare command protocols for joint military operations against enemies like the Undine and Borg.
- Reality Is Fluid: Eleya is able to convince an Undine commander that the Federation et al. were not responsible for the attacks on Undine spawning pools and hatchlings that sparked the current war, and that faction begins targeting the Undine that have been infiltrating the Alpha and Beta Quadrant powers and agrees to join the fight against the Iconians when the time comes. This pays off in the later story Beat the Drums of War.
- In the fic Safe and Sound, Kirk and Khan pull one of these, similar to the one they pulled in the second film, in order to save the kidnapped Nyota Uhura, Joanna McCoy and Lucille Harewood. This time, Khan doesn't betray him.
- In The Wrong Reflection, Eleya allies with the Klingon-Cardassian Alliance to attack a Terran Empire installation, but Eleya worries that the Alliance may turn on her to get its hands on the USS Bajor's technology.
- Blood and Honor: Sith Lord Sanguis and her team join forces with Republic soldiers on one occasion, Organa troops on anther, and a Jedi Master on a third. The first two team-ups are more or less voluntary - trading a favor for a favor - but the Jedi Master blackmails Sanguis into the alliance and she's not happy about it.
- Darth Vader: Hero of Naboo:
- Despite their instinctive infighting, every Dark Side user in the galaxy lends Vader their strength during his staged attack on the Jedi Temple because, as Plagueis states, it's forcing the Jedi to acknowledge that the Dark Side is still around and will not be ignored.
- Plagueis later aids the Jedi against Sidious, although he emphasizes his reason is solely to defeat Sidious.
- Padme seeks out others who hate the Trade Federation for help in driving them from her planet. One such individual rules what is functionally a planet-wide casino and whom she finds remarkably distasteful.
- According to a beat cop on Coruscant, some of the really nasty stuff in the lower levels is so bad that the gangs and police will work together to take them out. By the time of the sequel, the security forces are openly pardoning every criminal organization that is willing to work with them to fight the lower level monsters that are being drawn to the surface by the lingering effects of Sidious' Force Storm.
- Tarkin's Fist: Prior to the outbreak of hostilities with the Empire, the North American Union and the Union of South American Nations were mutually hostile nations locked in a small Cold War after an inconclusive three year shooting war. In order to beat the Empire Jonathan Harris, President of the NAU, is willing to make Hugo Chavez II, President of the USAN, his Vice President and de facto co-President of the new anti-Imperial global government being put together; the Confederacy of Earth Nations.
- In A Far Green Country, Durus and Surad were enemies of Elden and Nellas, but these four quickly become allies when they are chasing a common enemy.
- In A Child Shall Lead Them (Transformers), the Dinobots end up teaming up with Galvatron and Cyclonus to escape the Quintessons. Galvatron ends this alliance fairly quickly when he literally stabs Pterodactus Prime (aka Swoop) in the back.
- This is the best description of events in "Mistaken Trust" when Jacob allies with Tanya. Neither Jacob or Tanya like each other, but they share the goal of getting Edward and Bella apart so they can be with the relevant one, even after Jacob raped Bella.
- Rise of the Tau has The Remnant of the Imperium, the Forces of Chaos, da Orks, the Eldar and Farsight's Tau rebels teaming up against the Tau Empire. Also, the Chaos Gods, Gork and Mork, Ynnead and the Emperor tearing apart the Deceiver.
- Worldwar: War of Equals: In light of the pending threat of invasion by the Race, various nations around the world put aside their differences to form mutual defense pacts:
- Egypt and Israel set aside differences and set up a military alliance with Turkey before The Race arrives.
- Colombia and Venezuela, who were waging a war just months before the Race's arrival, agree to a cease fire and start preparing for the incoming invasion.
- Every drug cartel in Ciudad Juarez fights alongside the Mexican military in the city against Race forces.
- In Cenotaph Purity and Skitter team up to fight the ABB. On one hand a flying Blaster, ex-Nazi single mother. On the other, a ruthlessly intelligent, highly resourceful teenage highschool student and newly-minted orphan with dreams of being a hero. Together, they fight crime!
- Here Comes The New Boss has several cases of teaming up with someone dangerous to take down someone worse. Notably, even the Butcher voices in Taylor's head, while they don't like her being a hero or trying to avoid killing, are generally willing to reluctantly cooperate with her to take down gangs they have no respect for, like the Merchants.
- In The Return-Remixed, the remaining WWE Divas slowly come together, make peace with each other and unite to fight the bigger threat, the super-stable of returning Divas, DEAR. Michelle McCool even says "the enemy of our enemy is our friend" when burying the hatchet with Natalya.
- Where We Don't Belong: X and Y have formed one with Ontos, who had previously directly opposed them as both A and Alpha, to ensure that Aionios can exist once more. That said, the alliance is Teeth-Clenched Teamwork at best: Ontos makes it clear to them that if it weren't for the extraordinary circumstances, they would have erased the two Moebius immediately, X and Y are only cooperating with their self-proclaimed creator to fulfill their own agenda of bringing Z back, and ultimately they have very different reasons to want Aionios to exist again.
- The example from Wild Mass Guessing for The X-Files, suggesting that as soon as the aliens arrive on Earth, they'll promptly be beaten back by every single Monster of the Week, who tend to favor continuing to live on their planet.
- In Glass (Bellamy Taft), Kaiba plans to work with everyone, even those he personally dislikes, in order to escape. Yami Bakura and Joey feel likewise.
- Shadowchasers: Conspiracy has Italian mobster Fanciullo Cattivo forming a reluctant partnership with the heroes for mutual protection; both sides have emphasized it's temporary nature.
- With This Ring has quite a few of these, which makes sense when the protagonist is fairly utilitarian. The war against the Reach Interstellar Empire is particularly notable for its ability to unite even sociopathic serial killers, murderously violent xenophobes, Omnicidal Maniacs, and megalomaniac arcane entities in their desire to take down the Reach first and sort out their problems with each other later.Paul: Can.. we at least agree to fight the Reach first?
Grayven: If you stay out of my way, I will not seek you out.
Paul: I'll... Take that. Um, thank you. Good luck with your war against the Reach, I hope you don't die until right near the end.
Grayven: I hope that you die to no hand but mine.
