Halo 3

Sergeant Major Avery J. Johnson, voiced by David Scully, is a Marine who leads human forces against Covenant and Flood assaults throughout the Halo... series. Johnson and a few other Marines survive the destruction of Installation 04 and are rescued by Cortana and the Master Chief during the novel Halo: First Strike. Johnson plays a much larger role in Halo 2, by joining forces with Covenant Arbiter to stop Tartarus from activating Installation 05. Johnson is also the only human seen to survive a Flood infestation, due to a pre-existing medical condition, known as Boren's Syndrome, a condition that grants immunity to the Flood at the cost of mental instability. Boren's syndrome is caused from high exposure to radiation from plasma grenades. In Halo 2, he is awarded the Colonial Cross for his heroic actions, and leads UNSC forces to drive the Covenant from New Mombasa, Kenya after the Covenant take the city during the events of the game. Johnson is the sole character featured in the Halo Graphic Novel story, "Breaking Quarantine", which details Johnson's escape from the Flood in Halo: Combat Evolved, and a main character in Halo: Contact Harvest. In Halo 3, he is killed by 343 Guilty Spark when trying to activate the uncompleted Halo at the Ark.
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Master Chief Petty Officer John-117 is a fictional character and protagonist of the Halo fictional universe, created by Bungie. Master Chief is a... player character in the trilogy of science fiction first-person shooter video games Halo: Combat Evolved, Halo 2, and Halo 3 and will appear in the upcoming Halo 4. Outside of video games, the character appears in novels – Halo: The Fall of Reach, Halo: The Flood, Halo: First Strike, and Halo: Uprising – and has cameos in other Halo media, including Halo: Reach, Halo: Ghosts of Onyx, The Halo Graphic Novel and Halo Legends. He is voiced by Chicago disc jockey Steve Downes in the video games in which he appears. The Master Chief is one of the most visible symbols of the Halo series. Originally designed by Bungie artists including Marcus Lehto, Rob McLees, and Shi Kai Wang, the character is a towering and faceless cybernetically-enhanced supersoldier; he is never seen without his green-colored armor or helmet. Downes built his personification of the Chief off a character description which called for a Clint Eastwood-type character of few words.
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