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Not sure how many times CW did these amazing crossovers (3 or 4? I could be wrong) but, great start. I believe the last one was Invasion...So, Supergirl, Arrow, Flash & ends w/ LOT.
Thank god for the reveal at the end. Otherwise I could have never guessed who are they... I mean sure she has the exact hair and powers of Supergirl, but it could be Batman.