While we thought we were going to be treated to the ‘Big Bad’ reveal of ‘Savitar’s’ true identity on last night’s episode of The Flash, it turns out we are going to have to wait a while. One thing did happen last night that is going to change everything. SPOILER ALERT Caitlin Snow has become Killer Frost, and it looks as if this time there is no coming back from this change. Today we have the new promo for the next new episode of ‘The Flash‘ titled, ‘The Once and Future Flash‘. Check out the promo below and sound off with your thoughts AFTER THE JUMP. The Flash returns with all new episodes Tuesday, April 25th at 7pm Central on the CW.