Last Night’s Flash Advertisement In The Middle Of Arrow (Spoilers?)

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Does this mean we could see The Yellow Blur (Reverse Flash) on Arrow? Or will there be another crossver? And with Atom, Firestorm, and now possibly even OMAC joining the CW Universe, does this mean there are bigger team-ups on the way? (And if you hadn’t caught previous mentions of OMAC, last night the ATOM suit’s original designation was OMAC by Queen Consolidated.) More DC nods like this could lead to one big universe. I could get behind that! I wouldn’t even mind seeing shared villains (like Boomerang). Bring the Rogues to Arrow and Deathstroke and the Suicide Squad to the Flash!