4. Margo Martindale
Let's face it, Margo Martindale can do no wrong. Martindale played the deliciously evil Mags Bennett (for which she won an Emmy) on the second season of "Justified," who stands as one of the best TV villains in recent memory. Now she plays Claudia, Philip and Elizabeth's KGB supervisor, who continues to clash with her younger counterparts. Claudia's scenes are always fun to watch, even when she's getting repeatedly punched in the face. Martindale has established herself as one of the most versatile actresses around, and her presence on screen alone should be enough for people to tune in.