Olivia Cooke will play the daughter of the Hand of King Otto, whereas Matt Smith will play Prince Daemon Targaryen, King Viserys’ younger brother and heir to the throne. HBO’s prequel to Game of Thrones, House of the Dragon, has added three more key actors to its cast — Olivia Cooke, Emma D’Arcy and Matt Smith. Olivia Cooke, Emma D’Arcy, …
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