Animated House of the Dragon prequel show, Nine Voyages, is still "ongoing" according to Sea Snake actor Steve Toussaint, who has revealed he spoke to George R.R. Martin only last month.
Speaking to ScreenRant ahead of House of the Dragon season 3, Toussaint explained how the project switched from a planned live-action spin-off to an animated prequel around the release of House of the Dragon's first season, and that he could still voice a 21-year-old Lord Corlys in animated form.