Halo is a military science fiction media franchise, originally developed by Bungie and currently managed and developed by 343 Industries, part of Microsoft's Xbox Game Studios. The series launched in 2001 with the first-person shooter video game Halo: Combat Evolved and its tie-in novel, The Fall of Reach. The latest main game, Halo Infinite, was released in 2021. Combat Evolved started life as a real-time strategy game, then became a third-person shooter, and finally a first-person shooter releasing as an exclusive on Microsoft's new Xbox video game console after Bungie was acquired by the company. Bungie regained its independence in 2007, releasing additional Halo games through 2010. Microsoft established 343 Industries to direct the franchise going forward, and has produced games itself and in partnership with other studios. Combat Evolved was a critical and commercial success, serving as the Xbox's "killer app" and cementing Microsoft as a major player in the video game console space. Its sequels expanded the franchise's commercial and critical success, and have sold more than 81 million copies worldwide. With more than $6 billion in franchise grosses, Halo is one of the highest-grossing media franchises of all time, spanning novels, graphic novels, comic books, short films, animated films, feature films, and other licensed products. Plot Hundreds of thousands of years ago, the Mantle of Responsibility belonged to the Precursors, who gave all life to the galaxy. However, the Precursors wanted to give such power, instead of to the Forerunners as originally planned, to the human race. In retaliation, the Forerunners drove the Precursors into extinction. Instead of fighting back, the Precursors let themselves die to their creations, turning into a dust to later become themselves once again. It spread like wildfire due to ancient humans rubbing the powders on their pets, believing it helped their pets to live longer. However, instead of helping their pets, it eventually infected and contorted them into a new parasitic species, connected by a hivemind to the minds of the last Precursors: The Flood. The Forerunners sent the humans to Earth, reverting then to a primitive civilisation based in Africa, and fought the Flood, which spread through an infestation of sentient life and had overrun much of the Milky Way Galaxy. Exhausting all other strategies, the Forerunners conceived the Halo Array — ring-shaped megastructures and weapons of last resort that would destroy all sentient life in the galaxy to stop the