Cersei Lannister (Lena Headey)
Transformation on a 1 to 10 scale, 10 being the most drastic: 9. Cersei had the looks of a sweet fairy tale princess and the heart of a frozen b*tch; Lena, with her jet black hair, avant-garde hairstyles, and bicep tattoo, looks like one tough lady…but is probably a very nice woman, obviously.