Grant Gustin reveals the original cliffhanger ending to The Flash season


TVLINE | And as far as Thawne, who’s ostensibly “crackling around” out there somewhere, should we be afraid about what — or whose — form he next takes?
There was going to be a big Thawne cliffhanger at the end of what this season would have been, but that’s not going to be the cliffhanger we get. Episode 6x19, “Success Is Assured,” is going to end up being our finale, so we’re going to have a different cliffhanger than originally planned. But the cliffhanger at the end of 619 does serve as a pretty good finale.