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This Year's DC/CW Crossover Goes Into 'Crisis' Mode With Evil Versions of Supergirl, Flash, and Green Arrow

We now know the premise of this year’s gigantic, two-night CW crossover between The Flash, Arrow, Supergirl, and Legends of Tomorrow, and it’s a doozy—and a take on the classic comic book storyline of heroes fighting evil, alternate versions of themselves. But there’s a lot more to it than Evil Supergirl’s awesome…

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