Game of Thrones: Spin-off Wouldn’t Air Earlier than 2019 July 27, 2017; Game of Thrones: Four New TV Shows in the Works at HBO May 4, 2017; Game of Thrones: Prequel Series Still Possible Says A pilot for an aborted Game of Thrones spin-off cost HBO more than $30m (£22.5m), claims former executive Bob Greenblatt. Greenblatt is the former chairman of WarnerMedia entertainment, which is the parent company of HBO (now HBO Max). A new book by journalist James Andrew Miller, entitled Tinderbox: HBO’s Ruthless Pursuit of New Fronteirs A pilot episode for a scrapped Game Of Thrones prequel spin-off series is believed to have cost HBO over $30million (£22.5million) to make. The untitled spin-off, led by Naomi Watts, was set Which of the Game of Thrones spinoffs have likely been canceled? There were more than half a dozen Game of Thrones offshoot projects under development at HBO at the beginning of 2020. However, two of them, The Sea Snake and 10,000 Ships, the shows about Corlys Velaryon and Princess Nymeria respectively, have reportedly been canceled. According Fresh details have emerged about why HBO scrapped its costly first attempt at a Game of Thrones spin-off so suddenly, when it opted instead to green-light House of the Dragon. Before the upcoming One of the prequels has been cancelled (Picture: HBO) George RR Martin has confirmed that one of the Game of Thrones spin-offs has been scrapped. The epic franchise, which is set to spawn several There’s a huge number of Game Of Thrones spin-offs in development. A Jon Snow sequel series was recently announced, while shows based on Dunk And Egg, The Sea Snake and Ten Thousand Ships, are We Now Know Why Game of Thrones Spinoff Bloodmoon Was Canceled. HBO’s first idea for a Game of Thrones spinoff was ambitious and different. Perhaps too much so. By Alec Bojalad | July Naomi Watts was supposed to star in a Game of Thrones spin-off. HBO decided not to move ahead with the series after a pilot episode was shot. Another spin-off, co-created by series author George HBO's first planned Game of Thrones spinoff was canceled only after the network had already spent $30 million on the pilot. Back in June of 2018, HBO ordered a pilot for a Game of Thrones prequel series, the first of multiple planned spinoffs. Naomi Watts was cast in the lead role by October 2018, with production on the pilot getting underway x8ja.