Among the many derived works are several prequel novels, a famous TV series – Game of Thrones – and a comic book adaptation. Martin planned the series as a trilogy at first but has then moved on to envision a 7-volume series. The fifth and latest volume, A Dance with Dragons, was published in 2011 after 6 years of writing and editing. The series, based on author George R.R. Martin’s Dunk and Egg novellas, expands the Thrones kingdom beyond House of the Dragon, which is in production on its second season. With The Hedge Knight news, that means there are nine prequel and sequel series in development or in the works. 5 days ago · "House of the Dragon" was the first "Game of Thrones" spinoff series to air, after an untitled prequel series starring Naomi Watts, co-written by Jane Goldman and directed by S.J. Clarkson, was Game of Thrones was incredibly successful for the cable channel, and this prequel series could be even bigger. I do not doubt that it will be renewed. I do not doubt that it will be renewed. HBO. A new “ Game of Thrones ” project could be in the works at HBO, reports Variety. According to sources, HBO is “keen to move forward” with a series about Aegon I Targaryen, also known According to Entertainment Weekly, three other “Game of Thrones” prequel series are currently in development, including “The Sea Snake,” “Ten Thousand Ships,” and “Tales of Dunk and KgseXL9.