Dee Baker as the voice of Gravemind
Ken Boynton as the voice of a Brute
Tim Dadabo as the voice of 343 Guilty Spark and a Marine
Robert Davi as the voice of SpecOps Leader/ Shipmaster
Keith David as the voice of The Arbiter
Steve Downes as the voice of Master Chief
Robin Atkin Downes as the voice of the Prophet of Regret
Chris Edgerly as the voice of a Brute and a Grunt
Miguel Ferrer as the voice of the Heretic Leader
John Michael Higgins as the voice of 2401 Penitent Tangent
Orlando Jones as the voice of Sergeant Banks
John Kassir as the voice of a Marine
Nolan North as the voice of a Marine
Ron Perlman as the voice of Lord Hood
Brian Posehn as the voice of a Grunt
Kevin Michael Richardson as the voice of Tartarus
Terence Stamp as the voice of the Prophet of Truth
Jen Taylor as the voice of Cortana