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
The game opens as the "Pillar of Autumn" exits slipspace and discovers a large alien ringworld of unknown origin. The Covenant pursue the "Autumn" and heavily damage the ship. Following protocol, the "Autumn"s captain Jacob Keyes entrusts the ship's artificial intelligence (AI) Cortana to the Master Chief to prevent the Covenant from discovering the location of Earth. Chief, Cortana, and the ship's crew escape to the ringworld's surface while Keyes crash-lands the ship on the ring. On the ground, Master Chief and Cortana rescue other survivors. Learning Keyes has been captured by the Covenant, Master Chief and a group of marines infiltrate the Covenant cruiser "Truth and Reconciliation" to rescue him. Keyes reveals the ringworld is called "Halo" by the Covenant, and they believe it to be a weapon. Intent on stopping the Covenant from using Halo, Master Chief and Cortana fight their way to the control room, where Cortana enters Halo's computer systems. She sends Master Chief on an urgent mission to find and stop Keyes, who was looking for a weapons cache elsewhere on the ring.