The Flash Season 2: 11 Big Questions We're Asking After 'Flash Back'
9. How Will The Supergirl Crossover Play Into The Show?
Batman v Superman wasn't the only big DC character crossover to happen this week, as the much smaller budget, more critically acclaimed Supergirl/Flash crossover event episode also took place.
While that was very much a Supergirl episode, and took place on another Earth, it was slightly disarming that the was no reference of it here - until it becomes clear that actually, it hasn't happened in this chronology yet, given he has the tachyon technology in the crossover.
That means it's setup for the crossover, which has already happened, so how will that play into this show, if they reference it at all (they've got to, surely)?