'Game of Thrones' Spinoff , 'House of the Dragon' , Has HBO's Best Series Premiere Ever.br Associated Press reports that nearly br 10 million people tuned in for the premiere br of 'House of the Dragon' on August 21.br Associated Press reports that nearly br 10 million people tuned in for the premiere br of 'House of the Dragon' on August 21.br The 'Game of Thrones' spinoff br became HBO's most-watched series br premiere in the network's history.br The episode aired four times br on premiere night and it was br also streamed on HBO Max. .br According to AP, the number br of viewers in expected to keep br climbing in the coming weeks.br In May 2019, the 'Game of Thrones' br series finale was seen by br 19.8 million viewers on its first night.br In May 2019, the 'Game of Thrones' br series finale was seen by br 19.8 million viewers on its first night.br At the time, that was more than any other br series episode on HBO, with an estimated br 46 million people tuning in to see it.br At the time, that was more than any other br series episode on HBO, with an estimated br 46 million people tuning in to see it.br According to HBO, the weekly average of streams br of old 'Game of Thrones' episodes in August br was up nearly 90 from June.br The ‘Game of Thrones’ prequel br recaptured the fire of HBO’s original br masterpiece in a big way, Ashwin Navin, Samba TV co-founder and CEO, via Associated Press.br Research firm Samba TV estimated that the premiere of br the spinoff more than doubled the first-day viewership br of Netflix's latest season of 'Stranger Things.'.br Research firm Samba TV estimated that the premiere of br the spinoff more than doubled the first-day viewership br of Netflix's latest season of 'Stranger Things.'.br According to Samba TV's CEO and co-founder, Ashwin Navin, the challenge that HBO now faces is expanding 'House of the Dragon' beyond the series' built-in fan base.