Winter Is Coming Again: What We Know About the 'Game of Thrones' Prequel By Eliza Thompson of US Weekly | Dracarys! The After canceling one House of the Dragon, based on Fire & Blood. Following some pandemic-related delays throughout 2020, the show began production in April 2021. “George R.R. Martin’s world is so big, and what’s interesting about it, not only is it big, but he’s got a lot of road maps in terms of history,” Casey Bloys, chief content officer for HBO and HBO Max, said at a Television Critics’ Association event in February. “So one of the great things about