Miranda Richardson Joins HBO’s Untitled ‘Game of Thrones’ Prequel

A few weeks before “Game of Thrones” begins its final season, HBO has added another resident of Westeros to its prequel pilot: British actress Miranda Richardson. No character details are currently available for any of these parts on the prequel pilot, which is currently untitled (unless you are going by Martin’s recent blog post) and set to go into production this summer. But we do know lead Naomi Watts has been cast as a charismatic socialite hiding a dark secret.