Reprising your role as the bio-engineered supersoldier, you begin by repelling boarders on a planetary defence frigate but soon find yourself on terra firma, skirmishing with invaders amid the ruined cities then pursuing a key Covenant figure back to their neck of the galaxy. Picking up very soon after the events in its predecessor, the game begins with humanity's worst case scenario: religious fanatic alien alliance The Covenant invades Earth. Halo 2, then, is a sequel with no small amount of hype to live up to.
This now-legendary first-person shooter even converted people who wouldn't normally look at a gamepad, winning them over with accessible gameplay, an involving story and the xenocidal charms of its protagonist, the enigmatic Master Chief.
Every new console launches with at least one killer title, but in Halo Microsoft had found one that would not only ensure the future of its fledgling machine, but raise the bar for games on every platform.