SDCC 2019: The Arrowverse prepares for a Crisis in these new trailers for Arrow, The Flash and Supergirl

A massive event that was first hinted at back in 2014's first season of The Flash, last year's Elseworlds event finally pulled the trigger on the gun that fires off the Crisis on Infinite Earths gun, as the Monitor began rallying troops for the fight against the universe-ending machinations of the Anti-Monitor. That larger story will play out in the background of The Flash, Arrow and Supergirl, but until then those shows have some unfinished business of their own to attend to.