Pablo Schreiber is gearing up for “Halo.”

Schreiber has been cast in the lead role of the Master Chief in the Showtime series based on the hit video game franchise. Schreiber’s Master Chief is described as Earth’s most advanced warrior in the 26th century and the only hope of salvation for a civilization pushed to the brink of destruction by the Covenant, an unstoppable alliance of alien worlds committed to the destruction of humanity.

In addition, newcomer Yerin Ha will play a new character within the “Halo” world: Quan Ah, described as a shrewd, audacious 16-year-old from the Outer Colonies who meets Master Chief at a fateful time for them both.

“Halo” will begin production this fall in Budapest.

Schreiber was previously nominated for an Emmy Award for his role in the Netflix series “Orange Is the New Black.” He also appears as Mad Sweeney in the Starz adaptation of “American Gods.” Schreiber’s other TV credits include “The Wire,” “Weeds,” “The Brink,” and “Law & Order: SVU.”

He is repped by WME, Circle of Confusion and Jackoway Tyerman.

Ha was found after a worldwide casting search. She recently earned a degree from Australia’s National Institute of Dramatic Art and is known for her roles in several theatrical productions. She also starred in a short film for the Australian Chamber Orchestra.

She is repped by Australia’s Morrissey Management.

It was announced back in June that Showtime had ordered a 10-episode series based on the megahit video game after it had been in development at the premium cabler for years, though its order has since been trimmed to nine episodes. Kyle Killen and Steve Kane will serve as co-showrunners and executive producers. Darryl Frank and Justin Falvey of Amblin Television will also executive produce along with series director Otto Bathurst and Toby Leslie for One Big Picture, Scott Pennington for Chapter Eleven, and Karen Richards.

The series is produced by Showtime in partnership with 343 Industries and Amblin Television. It will be distributed globally by CBS Studios International.