A Crisis is coming to the Arrowverse — and it’s going to take quite a few superheroes (including familiar faces from past series) to stop it.

And it’s not just those from ArrowThe FlashDC’s Legends of TomorrowSupergirlBatwoman, and Black Lightning who will be stopping by to help. Among the special guests appearing are Smallville‘s Tom Welling (Clark Kent) and Erica Durance (Lois Lane).

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