Beau Willimon – who has worked on shows including House of Cards and Star Wars spin-off Andor – has been tapped to write the script for the film that is in development at Warner Bros.
A recent Hollywood Reporter cover story with Game of Thrones author George RR Martin teased that the picture will be a "Dune-sized feature film" based on King Aegon Targaryen's conquest of Westeros – which united six of the seven kingdoms around 300 years before the events of the Game of Thrones pilot episode.
HBO is also developing a TV series that is inspired by the exact same story.
Numerous spin-off projects have come to fruition since Game of Thrones ended on the small screen in 2019.
The prequel series A Knight of the Seven Kingdoms premiered earlier in 2026, while season three of House of the Dragon is set to arrive on screens in June.
Warner Bros involvement comes at an uncertain time for the studio following its recent $US110 billion ($A156 billion) acquisition deal by Paramount Skydance.
Paramount CEO David Ellison has promised the deal will "honour the legacy of two iconic companies while accelerating our vision of building a next-generation media and entertainment company".
The eighth and final season of Game of Thrones was heavily criticised by viewers, but Kit Harington – who played the prominent character Jon Snow – revealed recently he was left furious at the online petition to remake the episodes.
The concluding season of Game of Thrones was slammed for its reduced length and plot choices and Harington admits he and the cast were "tired" by the end of the show's run.
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