Milly Alcock. Actress: Upright. Milly Alcock is an Australian actress who catapulted to global fame after starring as young Rhaenyra Targaryen in the first season of the HBO television series House of the Dragon (2022), a prequel to HBO's Game of Thrones (2011). For the role, Alcock received a nomination for Critics' Choice Television Award for Best Supporting Actress in a Drama Series. She is also known for Upright (2019),...