Naomi Watts is about to go from Game of Thrones fan to one of its major players, as it's being reported that the Oscar-nominated actress has now been cast in HBO's upcoming Game of Thrones prequel series. According to Deadline, Watts will be playing a "charismatic socialite hiding a dark secret," though further details are being strictly kept under wraps - along with many of the finer details about the series and it's connections to the current Game of Thrones show. It chronicles the world’s descent from the golden Age of Heroes into its darkest hour.