Pablo Schreiber says the removal of Master Chief's famous helmet in the Halo TV series was "an important piece of the puzzle" in telling the show's story.
Canadian star Schreiber plays the genetically-enhanced hero in the adaptation of the video game franchise, which is arriving in the UK as part of the launch offering for new streaming service Paramount+.
The series follows the super soldier as he plays his part in the conflict between human beings and the alien order known as the Covenant.
Halo is now streaming on Paramount+.