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Charles Dance is going from fantasy to sci-fi. The Game of Thrones actor has landed one of the starring roles in Syfy’s ambitious miniseries adaptation of Arthur C. Clarke’s sci-fi classic Childhood’s End, EW has exclusively learned.

The six-hour miniseries follows a breed of aliens called the “Overlords,” who manage to peacefully invade and rule Earth, and create a pseudo-utopia that comes at the price of human identity and culture.

Dance plays Karellen, the ambassador for the Overlords who makes first contact with Earthling Ricky Stormgren (not yet cast). We’re told that “Karellen’s comforting words and amazing technological gifts quickly win humanity’s favor, beginning decades of apparent utopia at the cost of human identity and culture. However, his refusal to reveal his physical appearance and insistence on dealing only through Ricky have some people questioning whether his intentions are truly benevolent.”

Dance recently appeared in the film Dracula Untold, and is best known for his acclaimed work on Thrones as scheming patriarch Tywin Lannister. He’s expected to make a brief appearance in the HBO drama’s upcoming fifth season.

Childhood’s End has some notable auspices behind the camera, executive producers Akiva Goldsman (Lone Survivor) and Mike DeLuca (The Social Network). The project will be directed by Nick Hurran (Sherlock) and adapted by Matthew Graham (BBC’s Life on Mars). The miniseries will premiere on Syfy next year.