Mike Flanagan has tackled haunted houses, Stephen King and apocalyptic horror, but his next major challenge may dwarf them all: finding a way into Warhammer 40,000. The filmmaker says the Amazon series is proving far more difficult to shape than his planned adaptation of The Dark Tower, not because the setting lacks stories, but because it has almost too many.

Speaking on The Process Unlocked, Flanagan described the project as his “adaptation Everest.” His comparison with The Dark Tower gets to the heart of the problem. For Stephen King’s saga, Flanagan believes the path is clear: begin with the books, follow them in sequence, and make the necessary changes for television. King’s opening gradually introduces its world through a small number of characters and a simple pursuit.

Warhammer 40,000 offers no similarly obvious front door. Flanagan pointed to a universe spanning thousands of years, populated by enormous numbers of characters and supported by roughly 700 full-length novels. That scale creates a different kind of adaptation problem: deciding which corner of the setting can introduce newcomers without burying them beneath its mythology.

The series is being developed under Amazon’s broader Warhammer 40,000 screen deal with Games Workshop. Games Workshop says Amazon holds exclusive film and television rights for the universe, with the companies’ creative guidelines finalized in December 2024. It also warned that productions could take years to reach screens. Games Workshop’s announcement and Warhammer Community’s original announcement identify Henry Cavill as a star and executive producer attached to the franchise.

That makes Flanagan’s comments significant even though they reveal no plot details or release timetable. The project is not simply adapting one campaign, novel or video game; it is helping establish the entry point for a potential screen universe. Games Workshop has said the first production will determine what follows, while the company’s own update stressed that scripts and creative development had to come before a larger rollout. Its development update frames the process as the beginning of multiple possible stories.

Flanagan’s other high-profile Amazon project, a new Carrie series, is already streaming on Prime Video, giving the filmmaker a current relationship with the studio as he works through the Warhammer puzzle. Meanwhile, his Dark Tower adaptation remains in development, with recent coverage saying the project is still active but slowed by its sprawling rights and production requirements. As IGN reported , Flanagan’s most revealing update is that the Warhammer challenge is not figuring out what the universe contains—it is deciding where the audience should begin.

Image Credits

In-Article Image Credits

A match of Warhammer 40,000 via Wikimedia Commons by Ken O with usage type - Creative Commons License. Some parts of this file (minis) are not fully free but believed to be de minimis for this work. Derivatives of this file which focus more on the non-free element(s) may not qualify as de minimis and may be copyright violations. As a direct consequence, cropped versions of this file may require a review of their copyright status.