The Flash introduces Supergirl to Green Arrow and the Legends of Tomorrow in the first crossover trailer.
The CW has released the first teaser trailer for the upcoming four night crossover event for Supergirl, The Flash, Arrow, and Legends of Tomorrow. The trailer features Flash introducing Supergirl to the other various heroes. It is short but sweet and I know I am not the only fan that is incredibly excited to see all these heroes team up.
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Source: YouTube - Television Promos