
The Master Chief is the embodiment of Earth’s struggle for survival: one super-soldier feared, and even labeled as a demon by the Covenant. The race for control of the Halo becomes a race against time to destroy it, hampered by the Covenant forces, the Flood, and the AI controlled robot caretakers built by the creators of the Halo (the Forerunners). The halo turns out to be a defence against the flood, designed to kill all sentient life in the galaxy, thereby starving the unstoppable Flood. This race is unintelligent, aggressive, and has an insatiable taste for blood. The plot is thickened by the introduction of a second alien race, the ‘Flood’.

The Covenant are keen to do the same, to harness its vast power to use against Earth. The game follows the Master Chief (controlled by the player) as he explores the Halo and discovers its origin and purpose. Captain Keyes of the Pillar of Autumn initiates a crash-landing onto the Halo to prevent the Covenant from capturing information from his ship which would lead them to Earth.Ī ‘SPARTAN II’ super-soldier, the Master Chief, meets Keyes as the ship heads for the ring’s surface, and ejects in a life pod with an AI construct named Cortana. The ship happens across a huge orbiting ring, the titular Halo, and is attacked by Covenant forces. After being all but destroyed in a space battle, the sole remaining ship of a battle group, the Pillar of Autumn, jumps blindly into deep space to lead the alien aggressors away from Earth.

Human forces are engaged in a bitter war against the mysterious alien ‘Covenant’.
