Carina: I initially wanted to go with Nina Dobrev here -- shocker -- but I think that even in villainous roles, Dobrev is someone you want to root for. Clove should be a little bit colder. I think Troian Bellisario is the most underrated of the "Pretty Little Liars." She's got a sharp intelligence about her that screams Clove to me, and I can totally see her as a knife-throwing, callous villain. (That doesn't sound like a compliment... but it totally is.) Tierney: A "Harry Potter" and "Gossip Girl" veteran, I think Clemence Poesy is more than capable to play Cato's partner-in-crime.