Joe Otterson TV ReporterThe “Game of Thrones” prequel series “House of the Dragon” at HBO has unveiled its first official images.“House of the Dragon” is set a few hundred years prior to the events of “Game of Thrones” and tells the story of House Targaryen and the Targaryen civil war that became known as the “Dance of the Dragons.” The cast includes Paddy Considine, Olivia Cooke, Emma D’Arcy, Matt Smith, Steve Toussaint, Rhys Ifans, Eve Best, Sonoya Mizuno, and Fabien Frankel.The photos