"Halo is an epic journey to save humanity from a terrible menace." --Chris Carney on Halo 3: Legendary Edition: 7 steps to the domination.

The Halo Universe is the sprawling fictional universe in which all Halo Media takes place. Many of Halo's central events are set in the 26th century humankind has colonized hundreds of worlds across the Orion Arm of the Milky Way Galaxy, only to stumble upon a hostile alliance of aliens known as the Covenant. Motivated by the Prophets promises of ascension to godhood in the form of the eponymous Halo's, a series of ring-shaped superweapons built by the ancient race of the Forerunners, the Covenant are bent on humanity's destruction. With the apocalyptic Human-Covenant War concluded, members of both sides are faced with an uncertain future in a more politically complex envrioment of numerous diferent factions and affiliations, while ancient Forerunner entities and technologies continue to involve themselves with the galaxy's affairs.

It is this universe where the Halo video game series: Halo: Combat Evolved, Halo 2, Halo 3, Halo Wars, Halo 3: ODST, Halo: Reach, Halo: Combat Evolved Anniversary, Halo 4, Halo: Spartan Assault, Halo 2: Anniversary, Halo: Spartan Strike, Halo 5: Guardians and Halo Wars 2 take place. in addition to the games, a number of Halo novels and other medias including audio dramas, comic books, tabletop games, films, and an anime collection have been released. The media beyond the games series expands into the Halo universe timeline before and after the events of games, as well as running concurrently with the games' timeline.