HELP: Name an example from literature, film or history where two traditional enemies team up?

Or otherwise put aside their differences to fight a common enemy or problem.

Any response is appreciated. Thanks.

Cause usually the whole thing turns out to be just an elaborate rouse set up by the Joker to kill Batman. You'd think he'd've learned by now. What schlemiel.

Their beef goes back centuries, and the usual state of affairs had the UK siding with Prussia and the other northern German states against France.

to ill-fated results.

The Federation, Klingon, Romulan alliance against the Dominion.

Peter Lorre plays a child murderer who terrorizes the town. The police focus all their resources on finding him, including raiding all the establishments of the criminal underworld.

The criminals, upset with the intrusion, team up with the police to track down Lorre and try him in a banana court.

Flash gets all the races of Mongo, fierce rivals, to team up and defeat Ming. I don't remember the original serials all that well, but I seem to recall that was the basic strategy back then, too.

I am pretty sure there's something in the Old Testament to this effect as well. Post pentateuch, I think; not sure. I'll have to put it on the back burner of my brain; nice thing about that back burner is that sooner or later, I remember.

South Park episode. That one might be a little too highbrow, though.

Blade teams up with vampires to fight another group of vampires..that are dangerous to humans and other vamps.

Of course, that was the last thing Stalin wanted - he was a big fan of Hitler, and wanted to rule the world with him. He was shocked, absolutely SHOCKED that Hitler would violate the non aggression treaty!

Hell, the Soviet Union had only existed for 19 years at the time, and while relations were difficult given the extreme level of upheaval that had taken place, they at least seemed to be progressing in a positive manner. FDR was a believer in engagement, which is what was taking place between the two nations. The US as a whole was generally distrustful of the USSR (some of FDR's advisors thought it was nuts), more specifically of Stalin personally and communism generally, and vice versa, but the relationship from the establishment of diplomatic relations in the 30s had not at all progressed to the "traditional enemy" status that would emerge later.

As stated up-thread, France and England against Germany is a far better example, for both WWI and WWII.

Further, Stalin did not "love" Hitler. Stalin was one of the people who had read Mein Kampf and understood it, particularly the bits about the supposed needs of the German state to expand its borders into the Ukraine. Even had it not, German rhetoric openly directed in a way to ramp up hatred of the Soviet Union. Throughout the 30's, Stalin's foreign policy was centered around the idea of a collectivist defense strategy developed upon a buffer zone between the USSR and "the West." The goal with regard to Hitler was to use him as a tool against European hegemony, but this policy failed, and the Nazi-Soviet pact was an expression of that failure, a last-ditch attempt to prevent a debilitating war by tying the German war effort so closely to Russian exports that the Germans could not afford to attack them. Their relationship was, in other words, a defensive strategy on the part of the Soviets, one which Stalin appeared to have grossly miscalculated.

Fighting Deadites will unify any warring enemy troupes.

Plot summary (from Wikipedia)

In the late 21st century, an interstellar war between humans (associated as the Bilateral Terran Alliance, or BTA) and Dracs (a reptilian humanoid race) is being fought. Human pilot Willis E. Davidge (Dennis Quaid) and Drac pilot Jeriba Shigan (Louis Gossett, Jr.) engage in a spacecraft battle which results in both crashlanding on Fyrine V, a strange, dark alien world with a breathable atmosphere, water, and bizarre animal life.

After initial hostilities, the two eventually learn to cooperate in order to survive. They work together to build a shelter for protection against intermittent bombardment by meteorites, and to satisfy their needs for food, water, and warmth. Over a period of years, they learn to overcome their differences, become friends, and learn each other's languages and cultures. Each saves the other's life on at least one occasion.

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...I never get tired of watching it.
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Dennis Quaid (when he realizes that Louis Gossett, Jr. is pregnant): Well, don't look at ME!!
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It won the Hugo, Nebula and Locus awards: the trifecta of science fiction. Great story, great movie.

Professor Xavier and Magneto team up to fight Stryker.

Kirk and crew team up with Klingons to defeat a manipulating energy creature. Written by Jerome Bixby, one of the best episodes.

mutual interests

my cat and my dog teamed up to kill a bird together.
Normally they hated each other.

The TV series. Robin and Gisbourne join together against Prince John.

The detective allows Evie to start the train which blows up Parliment. He even stands on the roof watching the explosion with her.

They fought in Godzilla Raids Again and then teamed up in Destroy All Monsters.

Well, what did you think I was going to answer with? :)

you know...for "the cause", or when Melanie was in labor, or many other times during GWTW.

(sorry, that's the main example that comes to mind right now)

Goldmember.