Ten Thousand Ships
Ten Thousand Ships is a series set approximately 1,000 years before Game of Thrones and would chronicle the journey of the warrior princess Nymeria from Essos to Dorne, following her defeat at the hands of the Dragonlords of Valyria. After being shelved, the project saw a glimmer of hope when Martin announced that he had collaborated with 2024 Pulitzer Prize winner Eboni Booth on a new pilot. The playwright expressed her enthusiasm, while wryly noting the enormous production challenges associated with ships, dragons, and gigantic creatures. The spin-off is currently in development.
Bloodmoon
The series, set thousands of years before the events of Game of Thrones, has been permanently canceled. The story would have explored the legendary Age of Heroes, recounting the origins of the Long Night—the terrible winter that ravaged Westeros—and the emergence of the threat of the Others (White Walkers). A dark and untold chapter in the history of the world created by Martin, which unfortunately will never make it to the screen.
Aegon’s Conquest
The spin-off would follow Aegon I Targaryen, his sisters Visenya and Rhaenys, and their respective dragons—Balerion, Vhagar, and Meraxes—during the conquest of the Seven Kingdoms of Westeros. The project would serve as the origin story of the Targaryens’ rule over the continent and would recount the birth of one of the most important symbols of the Game of Thrones saga. Earlier this year, The Hollywood Reporter confirmed the project, which is being considered in two possible formats: as a television series for HBO or as a blockbuster film produced by Warner Bros.
Sea Snake/Nine Voyages
An animated spin-off dedicated to the legendary maritime explorations of Corlys Velaryon—the famous “Sea Snake” and husband of Princess Rhaenys Targaryen—is also reportedly in development. According to rumors reported by Deadline in early 2026, legendary animator Genndy Tartakovsky—creator of acclaimed series such as Primal and Samurai Jack—may be involved in the project. Tartakovsky is no stranger to creating animated prequels set in major narrative universes: among his best-known works is Star Wars: Clone Wars, the Cartoon Network series that foreshadowed the success of the CGI series Star Wars: The Clone Wars.