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Who are they after?
A super-powerful alien species has landed on Earth-1 and, in the final part of the epic four-part CW Arrow-verse crossover, we're going to learn exactly why the Dominators have returned to planet Earth: They want one of the team's superheroes.
The Dominators originally showed up on the planet to conduct research to figure out if humans are a potential threat to their planet. The humans of Earth in the '50s didn't pose a threat, but now the planet's population includes meta-humans, Kryptonians, and vigilantes with both high-powered suits and assassin training. In other words, the Dominators aren't willing to wait for the fight to come to them.
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