As the parasite overruns the city, the Prophet of Mercy is consumed, and the Prophet of Truth orders Tartarus to take Keyes, Johnson, and Guilty Spark to Halo's control room and activate the ring. The Master Chief is teleported into High Charity, where a civil war has broken out among the Covenant The Flood-infested In Amber Clad crashes into the city, and Cortana realizes that Gravemind used them to take over High Charity. The Gravemind reveals to the Arbiter that the Great Journey would destroy the Flood, humans, and Covenant altogether, and sends both the Arbiter and Master Chief to different places to stop Halo's activation. The creature, Gravemind, is the leader of the Flood on Installation 05. The Arbiter is saved by the tentacled creature and meets the Master Chief in the bowels of the installation. The Master Chief and Cortana race back to Earth to warn of an impending invasion by Covenant forces. Instead of activating the ring, however, the Master Chief turns on Guilty Spark and his robots and detonates the Pillar of Autumn 's engines, destroying the installation and preventing the escape of the Flood. The human supersoldier Master Chief Petty Officer John-117 and his AI companion Cortana learn from Halo's AI monitor, 343 Guilty Spark, that activation of the Halos will prevent the spread of the Flood by destroying all sentient life the parasite can subsist on in the galaxy. Leading a guerrilla insurgency on the ring's surface, the humans discover that the rings are actually weapons of last resort built to contain a terrifying parasite called the Flood. The crew discovers a Forerunner ringworld called Halo, which the Covenant wants to activate because of their religious belief that the activation of the ring will bring about a 'Great Journey,' sweeping loyal Covenant to salvation.
After the human bastion at the planet Reach is destroyed, a single ship, The Pillar of Autumn, follows protocol and initiates a random slipspace jump to lead the Covenant away from Earth. Declaring humanity an affront to their gods, the Forerunners, the Covenant begin to systemically obliterate the humans with their superior numbers and technology.
According to the game's backstory, the outer colony world of Harvest was decimated by a collective of alien races known as the Covenant in 2525. Humans, under the auspices of the United Nations Space Command or UNSC, have developed faster-than-light slipspace travel and colonized numerous worlds. Movies that I believe will come true: Wall-E, Idiocracy Halo 1 > all other Halo games.
The player alternately assumes the roles of the human Master Chief and the alien Arbiter in a 26th-century conflict between the human United Nations Space Command, the genocidal Covenant, and the parasitic Flood. The game features a new game engine, as well as using the Havokphysics engine added weapons and vehicles, and new multiplayer maps.
A Microsoft Windows version of the game was released on May 31, 2007, developed by an internal team at Microsoft Game Studios known as Hired Gun. Released for the Xboxvideo game console on November 9, 2004, the game is the second installment in the Halo franchise and the sequel to 2001's critically acclaimed Halo: Combat Evolved. Halo 2 is a 2004 first-person shooter video game developed by Bungie.