“House of the Dragon” stars Emma D’Arcy and Olivia Cooke speak to “Extra’s” Jenn Lahmers about the long-awaited “Game of Thrones” prequel. Emma dishes on her character Rhaenyra Targaryen’s desire for the throne and for agency as a woman. Olivia also teases that her character Alicent Hightower becomes a pawn in her father’s political agenda. Plus, Emma reflects on being the first non-binary person cast in the “Game of Thrones” franchise. “House of the Dragon” premieres August 21 on HBO and HBO Max.