One of the most exciting things about Team Flash heading to Earth Two is the fact that they all have doppelgängers over there, and you'd imagine that we will get to meet all of them at one point or another. That means alternate versions of Cisco, Barry, Joe, Iris, and perhaps a few others, and it'll be fun to see what they do and what their relationships are over on Earth Two. It could also give us some major clues to Zoom's identity, as there's a strong chance he is the doppelgänger of a character we already know. Then, of course, there's Caitlin Snow. It's on Earth Two that we are finally going to meet her villainous alter-ego, Killer Frost. Teased in the Season 1 finale, it's been another thing fans have had to wait for, but the prospect of this evil Queen Elsa appearing is a great one. Hopefully it won't just be a one-and-done character, and that they could develop a real storyline, because Danielle Panabaker hasn't had an awful lot to do on The Flash this year, and deserves this chance now.