More proof that flashbacks are coming to the next season of Game of Thrones: The show has reportedly cast tween actress Nell Williams to play a younger version of Cersei Lannister. Book fans probably have a good idea of what she’ll be doing, but if Game of Thrones has taught us anything, it’s not to make any guarantees of who will show up and when. IMDb indicates that Williams will appear in the first three episodes of Thrones’ fifth season — here’s hoping she’s been working on her smirk.