https://www.cnet.com/news/halo-tv-show-will-feature-master-chief-in-lead-role/

How can a TV series have a major character whose face is never seen? It happened with Charlie's Angels (though admittedly, detective agency owner Charlie was never the star), and apparently Showtime thinks it can work with the network's upcoming TV series based on the video game Halo.

Though Halo's Master Chief's face is never seen in the games, he'll be a lead character in the show, Showtime Programming President Gary Levine told IGN.