One of the stars of Game of Thrones is reportedly joining the cast of Man of Steel 2 a.k.a. Batman vs. Superman.

Jason Momoa, who played Khal Drogo in season 1 of Game of Thrones, is reportedly signing on to play an unknown role in Man of Steel 2. The casting news, which was posted by The Hollywood Reporter Monday, suggests that the cast of Man of Steel 2 is gradually coming together in the months leading up to filming.

As for what role Momoa will be playing, Warner Bros. and DC are keeping it a secret. However, The Hollywood Reporter suggested that Momoa could be playing Doomsday, the powerful super villain who famously killed Superman in the comics in 1992. A source close to production is also claiming that Warner Bros. is gradually introducing Justice League members, indicating that he could be playing Martian Manhunter, a muscular alien trapped on Earth.

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Momoa has played many muscular brutes in his career, including Khal Drogo in Game of Thrones and Conan in the 2011 reboot of Conan the Barbarian.

Warner Bros. has not confirmed Momoa's casting. Assuming the report is true, Momoa will be joining an all star cast that includes Ben Affleck as Batman, Henry Cavill as Superman, Gal Gadot as Wonder Woman, Amy Adams as Lois Lane, Laurence Fishburne as Perry White and Diane Lane as Martha Kent.

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Man of Steel 2 is scheduled for release in theaters on July 17, 2015.

Watch a highlight of Momoa on Game of Thrones here:

Tags: Man of Steel 2 Batman vs. Superman