The 'Orange Is the New Black' alum will lead the project as the iconic video game character.

Prepare for battle! Showtime has unveiled castings for its upcoming live-action Halo television series, based on the best-selling Xbox video game franchise. As revealed in November, the show will revolve around Master Chief, the helmeted super-soldier at the center of the game series. Pablo Schreiber (American Gods, Orange Is the New Black) will star as the Spartan commando. There's no word on whether Schreiber's version of the character will remained masked like his video game counterpart.

Joining Schreiber is Australian newcomer Yerin Ha, who will play a newly created character in the Halo universe, Quan Ah. Quan Ah is described as a "shrewd, audacious 16-year-old from the Outer Colonies who meets Master Chief at a fateful time for them both." Ah was discovered during a worldwide casting search and is known for her stage work Down Under. The Showtime series will follow plots set forth in the games, which focused on the 26th century conflict between humanity and the alien race known as the Covenant. The show will "weave deeply drawn personal stories with action, adventure and a richly imagined vision of the future." The project will begin production in Budapest, Hungary, in the fall.