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In , after a long and bloody war between the Sharen and Sarghress clans, who have long considered one another to be their Drow Tales Arch-Enemy, Sabbror agrees to turn over all Sharen holdings in exchange for the Sarghress clan's help in getting revenge against the traitors that condemned the Sharen to a .
Fate Worse than Death Defies this with Maxim 29 from Schlock Mercenary The Seventy Maxims of Maximally Effective Mercenaries: "The enemy of my enemy is my enemy's enemy. No more. No less." but the actual trope does come into play at least once. True to the maxim, both sides will invariably race to put their knife in the others' back first.
During the "Dangerous Days" arc of , the gang's (first) trump card against Hereti Corp is Sluggy Freelance Oasis, who had kidnapped or tried to kill most of them in the past. Only her devotion to Torg and mind control programming kept her somewhat on their side.
Also, due to his Sociopathic Hero nature, almost any time Bun-Bun is persuaded to help the other characters has shades of this.
In , after a Tower of God Mêlée à Trois between Viole, Arkraptor and Kang Horyang seemed to have no end, Arkraptor and Horyang decided to team up against Viole. It didn't work.
The Order of the Stick Elan and Thog temporarily team up to escape from prison and travel back to the Order after Elan "fast-talk" Thog. Being both Cloudcuckoolanders, they get along surprisingly well.
The City-State of Cliffport gives its backing to Gobbotopia's claim to nationhood, since both nations have been attacked by the elves.
While Elan sees his father Tarquin as evil and doesn't want his help at first, later when it comes to defeating Nale they rather Agree to Disagree.
And promptly subverted when Tarquin allies with Nale.
In the prequel, the appropriately-named , Right-Eye attempts (unsuccessfully) to ally with human wizard Eugene Greenhilt, despite hating humans, in order to eliminate the threat Start of Darkness Big Bad Xykon poses to his own goblin minions.
According to the only way to get Iran and Iraq to stop fighting each other is to present them with someone they hate more: Scandinavia and the World, Denmark and his Muhammed cartoon.
The Light Warriors of are in a constant state of this. It's stated that the greatest threat to the team is each other.
8-Bit Theater : Basic Instructions How to Unite Against a Common Foe
In , the Prospitian and Dersite armies briefly Homestuck unite against Jack before being slaughtered en masse; the survivors are pretty chummy from then on.
In , when Blitz' kiwi mecha gets impounded, she decides to steal it back. She enlists the help of an earlier foe, a master thief known as The Raccoon.
Kiwi Blitz In , the far right wing of the Republican Party allies itself with al Qaeda to kill Fafnir The Dragon Barack Obama on the day of his inauguration, which sets off the first arc of the series.
The pirates and the Imperial Guard of Dubious Company are forced into this after Izor's Amazing Plan gets screwed and throws everyone into an alternate dimension.
; during the "Popsicle War" arc, when Penny and Aggie Meg and Karen and their clique (including Charlotte and Cyndi) executed increasingly cruel stunts against both Penny and Aggie and their respective friends, Penny(whom Aggie had previously seen as a friendly enemy) forged a truce with Aggie to stand against Meg and Karen. This led to Penny and Aggie becoming Fire-Forged Friends (and in later arcs something more...). During the final arc, Aggie wrote a sonnet about her history with Penny, summing up the Popsicle War arc with this stanza:
In , Rusty and Co. Mimic points out the wisdom of this to Yuan-Tiffany, since they don't want to kill each other.
In TwoKinds one of the main character's old friends is a bit biased against Keidran. However when the rest of their party is incapacitated by an assassin attack, he has to put aside some old grudges.
In , Snowflame and his Snowflame Hero Antagonists have to work together to bail out Arkham Asylum after it is flooded with fear gas.
In , Golbez agrees to team up with Samus Aran against Eggplant Wizard and the Monkeyspank viral AI, mainly because he knows he doesn't know enough.
Captain SNES : The trope is briefly but eloquently demonstrated by Ménage à 3 Yuki and Sonya in this strip. They can't stand each other, but Angel just made the mistake of challenging Yuki's ego, Sonya's competitiveness, and the woman they both love.