He is the protagonist and main playable character in Halo: Combat Evolved, Halo 2, Halo 3 and the upcoming new trilogy. In the games, John is only ever referred to by name once, by Cortana, in the ending cutscene of Halo 3 before the credits. He is referred to universally by humans simply as the "Master Chief", "Chief" for short and "Sierra-117". The Covenant is aware of the power of the Spartans, and refer to the Master Chief as "the Demon", although, after the Great Schism,Thel 'Vadam and Rtas 'Vadum called him Spartan. John is referred to as "Reclaimer" by both 343 Guilty Spark and 2401 Penitent Tangent, although this seems to be a universal title given to all humans, rather than specifically referring to John-117.