A direct-to-video animated film produced by DC Comics
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Essentially we have one Earth that has the Justice League that we know and love as a benevolent organization that is out to protect the citizens of Earth from foul play, and another Earth where the like powered super-powered denizens formed a group called THE CRIME SYNDICATE... which is a super-powered team of mobsters that have divided up the Earth and have been tormenting, extorting and killing all those that would oppose their reign. Meanwhile, on that planet - we have the former leader of the superpowered resistance, LEX LUTHOR - travel to an alternate Earth, with our regular heroes. He manages to convince them to come back to thwart the evildoers.
http://en.wikipedia.org/wiki/Crisis_on_Two_Earths