Whatever the reasoning, The Flash will give the S.T.A.R. Labs team a completely new obstacle to deal with, which could literally be anything in any number of universes. Let's not forget that this new threat is coming the week immediately after Barry brings Supergirl to Earth-1 for this week's mega-crossover where all The CW's DC heroes take on the alien Dominators. And it was just two weeks ago when the show brought in its entirely new big bad, the god of speed Savitar. So if whatever comes after all that is remarkable enough to still defy everyone's expectations, it's bound to be a doozy, right?