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: Combat Evolved
Defying 343 Guilty Spark, who sends his robotic Sentinels to stop them, Master Chief and Cortana decide to destroy Halo to prevent its activation or the escape of the Flood. Needing Keyes' command codes to destroy the "Autumn" and Halo with it, Master Chief returns to the "Truth and Reconciliation", only to find Keyes assimilated by the Flood. Retrieving the codes from the captain's remains, Master Chief returns to the "Autumn", but the self-destruct sequence is stopped by 343 Guilty Spark. Instead, Master Chief and Cortana manually destabilize the ship's reactors, narrowly escaping the blast in an aircraft. In a brief post-credits scene, 343 Guilty Spark is shown to have survived Halo's destruction.