Although Master Chief may have taken off his helmet in the first episode of Halo, he has rarely done so in the past, and there is a good reason why his face was never shown in the games. The Halo TV series promised in its teasers that the Master Chief will appear in the programme, and it made good on that promise in the first episode. The character Master Chief has occasionally been able to remove his helmet in the games, but his face has only occasionally been seen, making this the most significant facial revelation in the history of Halo.
The Master Chief, played by Pablo Schrieber, took off his helmet in the first episode of Halo, exposing his entire face. Master Chief and a group of UNSC Spartans are able to seize the potent relic the Covenant were attempting to acquire after battling back against them after they invaded a colony on the world of Madrigal. Some of Master Chief’s lost memories are brought back by contact with the artefact, leading him to break orders and save Kwan Ha, the only survivor of Madrigal.
In response to this change, Master Chief took off his helmet in try to win Kwan’s trust; as a result, his face was shown for a sizable chunk of Halo’s pilot episode. The portrayal of Master Chief in the video games, in which he hardly ever removed his helmet and his face was almost never shown, has slightly changed with the appearance of the character’s face. The tale is nonetheless compelling despite the TV show breaking with precedent because it was decided upon for different reasons than in video games. The Master Chief’s whole face was never seen in the Halo games, but rather to aid in the player’s immersion in the character rather than for story reasons.