Played By: Lena Headey
You Can Also See Her In: "300", "Imagine Me and You," "Terminator: The Sarah Connor Chronicles"
Character Backstory: Cersei is the wife of Robert Baratheon, who dies in the first season of the show, and the mother of King Joffrey. But behind the scenes, she's also been carrying on an incestous relationship with her brother Jaime for several years and produced several children out of that union. She's cold, cunning and manipulative.