Williams appears as Arya Stark in the eighth episode of the second season of Game of Thrones, The Prince of Winterfell. Charles Dance plays Lord Tywin Lannister, and Tom Wlaschiha plays the assassin Jaqen H’ghar. At the castle of Harrenhal, Lord Tywin decides to march his army west to face Robb Stark, Arya’s older brother. Arya realizes that she has missed the chance to have Lord Tywin assassinated by Jaqen H’ghar. With the help of H’ghar, she and her companions are able to escape Harrenhal.