HBO has picked up a second season of fantasy series “Game of Thrones” on the heels of solid numbers for Sunday’s premiere. Genre shows have been popular with young adults over the past year, with HBO’s “True Blood” and AMC’s “The Walking Dead” often beating their broadcast competition in adults 18-49.

On its opening night, “Thrones” drew 2.2 million viewers in its regular 9 o’clock slot, and then added another 1.2 million for its quickie repeat at 10:05 p.m. (where it likely picked up viewers following the completion of the Boston-New York NBA playoff game on TNT). Throw in the 11:15 p.m. airing (800,000) and “Thrones” drew 4.2 million viewers, according to HBO. More..