5. Killer Frost II
Caitlin’s Earth-2 doppelganger Killer Frost was surprisingly killed off at the tail end of season two. Still, something tells us that, in one form or another, the icy evil-doer will be back next season.
For starters, Killer Frost is a fairly prominent villain in DC’s catalogue and The Flash team would surely not be done with her so quickly. No, it is far more likely that season three will deal with Caitlin becoming Killer Frost herself. Everything about her character arc so far suggests she is going in that direction.
Much has been made about how Caitlin has had her friends at STAR Labs to help her through her traumatic experiences (she was engaged to a schizophrenic flaming man and dated a psychopathic speedster – she definitely knows how to pick them!). However, her apparently fake speech to Zoom in the finale, about embracing the darkness within, might have more truth to it than her colleagues know.