Warning! The following contains spoilers for The Flash series finale "A New World: Part 4." Read at your own risk!
The Flash closed out its nine-season run in a most epic fashion, as Eddie Thawne used his new Cobalt Blue persona to bring back almost all of Barry's greatest rivals in an attempt to kill him once and for all. Fortunately, Team Flash was prepared for the just such a cataclysmic situation, and managed to defeat the villains and save Central City yet again. And while this was the swan song for this particular series, The Flash's finale actually set the stage for a potential follow-up somewhere down the line by introducing a batch of new characters who will now be just as capable of protecting the Arrowverse as Barry Allen, but without necessarily using star Grant Gustin.
