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* ''WebAnimation/DSBTInsaniT'': Not so much 'evil' as they just dislike Koden and the others, but Dave and Lisa will help out when the MonsterOfTheWeek rears its ugly head. CharacterizationMarchesOn by episode 5, where helping becomes less of an issue for them.
* ''WebAnimation/{{Haloid}}''. When Samus and MC first meet, Samus attacks MC for no good reason and they start a running battle. When more Covenant troops show up, Samus and MC join forces to fight them, including a BackToBackBadasses moment. {{Justified|Trope}} as neither Samus nor MC recognize the other as human at first, and [[PoorCommunicationKills each presumes the other to be more of the enemy]]. Once Samus is down to her Zero Suit, MC stops attacking her [[spoiler: [[HeadTurningBeauty for more than one reason]]]], and once Samus gets a good look at [[spoiler: Nicole]] through the visor, she stops attacking [[spoiler: her]] as well.
* Invoked twice in ''WebAnimation/IfTheEmperorHadATextToSpeechDevice''. One of the few good things that can be said about the modern-day Imperium of Man is that racism is more or less considered a historical anachronism.... for the most part. In an entire galaxy teaming with hostile aliens and in a government founded on the concept that humanity is the rightful ruler of the stars, nobody is really interested in wasting time hating each other when there are xenos that need killing.
** Also more broadly invoked in the "Slaaneshmas" special. Once again, speciesism prevails over human in-fighting when the chaos-corrupted human armies and traditional Imperial armies agree to a one-day truce every year... so they can team up to murder aliens instead.
* In ''WebAnimation/JurassicSagaSFM'', the alternate take of ''Film/JurassicWorldDominion'' has the ''Tyrannosaurus'' and ''Spinosaurus'' joining forces to battle the ''Giganotosaurus''.
* In the ''VideoGame/LeagueOfLegends'' cinematic [[http://youtu.be/tEnsqpThaFg "A Twist of Fate"]] Garen and Annie fight against Katarina and Tryndamere, until the Baron Nashor shows up. Naturally, they choose to team up against the greater menace.
* In Episode 9 of ''WebAnimation/MegaManDiesAtTheEnd'', [[spoiler: Mega Man and Dr. Wily]] have to work together to escape from the guards.
* ''WebAnimation/TheMostPopularGirlsInSchool'': Shay and Mackenzie, and to a lesser extent, Brittnay and Saison, do this in Season 3 to take down the BigBad, [[spoiler: Jenna Darabond.]]
* ''WebAnimation/RedVsBlue'': Happens quite a lot as the series goes on. The Red and Blue teams first join forces to battle O'Malley, then later the Meta, and later still, threats like the remains of Project Freelancer or Felix. While they still don't like each other very much, they've long since ceased to be true enemies, and now work together more often than not.
* In ''Red vs Blue 3,'' (no relation to the {{Machinima}} series by Rooster Teeth) Red and Blue are about to have their epic showdown when Green comes in and beats them up. The result? Red and Blue perform a FusionDance to create Purple, who swiftly kills Green in the span of less than 10 seconds.
* Webanimation/StupidKids: In ''[=SziaFalva=] Háborúja'' (''War of [=HiVille=]''), when Timmy attacks [=HiVille=] with his MechaMooks, Raccoon helps the titular trio and friends because he does not wanna get killed too by Timmy and knows they are the best bet to defeat him, and [[OnlyOneAllowedToKillYou he wants to kill the titular trio himself]].
* The third episode of WebAnimation/ToonSandwich's "WebAnimation/SuperHeroBowl" series, "Super-Showdown-Bowl!" has both the heroes and the villains of their films team up to take down the Oscar upon realizing from Dr. Manhattan that they were nothing more than puppets to be used for the entertainment of massacring each other for eternity.

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