Game of Thrones was a hit for HBO, so the company began to think about spin-offs of the show long before the final season in 2019 was released. Several of them were put into production, one even spent $ 30 million, but then canceled. This is stated in the recently released book Tinderbox: HBO’s Ruthless Pursuit of New Frontiers by Andrew Miller.
Yes, a lot of money was spent filming the pilot of the prequel, which was set in the era of heroes, thousands of years before the events of the original. The show was supposed to tell about the appearance of the White Walkers and the Stark house.
Unfortunately, the pilot turned out to be terrible and Casey Blois and Bob Greenblatt canceled him. The script of the show was already ready and the actors were recruited. Subsequently, Casey and Bob agreed that instead of spending $ 30 million on a pilot, it was better to start filming the entire show right away so as not to lose money.
The Game of Thrones spin-off Blood of Dragons is set to air in 2022 on HBO.