12. KATE MARA

Show: American Horror Story
Now inarguably known as one of the scariest TV shows of all time, FX's haunted house drama took karma to another level, literally. As the beautiful but bat-shit crazy Hayden, Kate Mara (one half the lovely and talented Mara sisters) played cheating husband Ben’s desperate and eventually undead and vengeful mistress who relentlessly attempts to foil all of his plans to repair his broken family.