Master Chief (Halo)
MCPON John-117, or "Master Chief", is a fictional character and the protagonist of the "Halo" fictional universe created by Bungie. Master Chief is a playable character in the series of science fiction first-person shooter video games "", "Halo 2", "Halo 3", "Halo 4", and "". Outside video games, the character appears in books and graphic novels—"", "", "", and ""—and has cameos in other "Halo" media, including "", "", "The Halo Graphic Novel", "Halo Legends" and "".
Halo 3
"Halo 3"s protagonist is Master Chief Petty Officer John-117, a surgically enhanced supersoldier known as a "Spartan". The Chief fights alongside the Arbiter, a disgraced Covenant Elite commander. Two other Elite characters, N'tho 'Sraom and Usze 'Taham, appear as the third and fourth players in cooperative play. Supporting characters from previous games return, including human soldiers Avery Johnson and Miranda Keyes. The Forerunner artificial intelligence 343 Guilty Spark, who tries and fails to stop the Master Chief from destroying its ringworld in "Halo: Combat Evolved", also makes an appearance. Also playing a role in the story is the Flood entity known as the "Gravemind". In "Halo 2", this leader of the Flood escapes from confinement on Installation 05, invades the Covenant mobile capital city of "High Charity", and captures Cortana, a human-created artificial intelligence.