‘House of the Dragon’ Hunk Fabien Frankel on Emilia Clarke’s Birthday Party and Matt Smith’s Rehearsal Injury: ‘I Take No Responsibility’

Ask Fabien Frankel about his favorite “Game of Thrones” character, and the actor drops his head seemingly in agony.“Where to begin?” he says with a groan. “Oberyn Martell. Tormund. Jon Snow. Mance Rayder. Brienne of Tarth. Arya Stark. Oh mate, I love them all.”Soon enough, Frankel could join their ranks, as Ser Criston Cole, the dashing, Dornish hottie who turns multiple heads in HBO’s impending “Thrones” prequel series, “House of the Dragon.” The series — which traces how the Targaryen dynasty rips itself apart roughly two centuries before the events of “Game of Thrones” — boasts a starry ensemble, ...