Warning: Spoilers ahead for the first episode of “House of the Dragon.”Sunday nights in Westeros are back.The “Game of Thrones” spinoff show, “House of the Dragon,” kicked off with a bang on HBO Sunday night, with fans tuning catch up with the dragon riding, incestuous Targaryen family and their questionable platinum wigs.“Game of Thrones” made fantasy TV appointment viewing during its run from 2011 to 2019, and it looks like “House of the Dragon” might bring that back. The show takes place around 200 years before the events of “Game of Thrones” and is based on George R.