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Super-soldier John-117, Master Chief of the United Nations Space Command, must battle a genocidal alien race known as the Covenant following his violent crash-landing on Halo, an ancient and mysterious ring-world.
Halo: Combat Evolved
As the alien Covenant invade Earth, the Master Chief must defend humanity's homeworld whilst discovering more about the rings called "Halo."
Master Chief and the Arbiter must join together to attack the Covenant and destroy the Flood.
A UNSC Orbital Drop Shock Trooper must locate his missing squad members in New Mombasa following a devastating slip space rupture caused by a Covenant cruiser.
Halo 3: ODST
A highly-trained branch of the UNSC known as the Noble Team must defend the planet of Reach from a massive Covenant invasion.
After being awoken from cryogenic sleep, Master Chief crash lands on a planet infested by aliens known as Prometheans.
Peace is shattered when colony worlds are unexpectedly attacked. And when humanity's greatest hero goes missing, Spartan Jameson Locke is tasked with hunting the Master Chief and solving a mystery that threatens the entire galaxy.
Halo 5: Guardians
Assisted by a squad of Spartans, the UNSC forces fight to defend the colony world of Harvest from the Covenant, and push them off of the planet.
After spending decades in cryogenic sleep, the crew of the Spirit of Fire wake to find themselves on a Forerunner installation known as the Ark. But they are not alone.
Halo Wars 2
The human UNSC and Sangheili signed a ceasefire to end a decades-long war. Gameplay follows through the perspective of the Spartan supersoldiers Sarah Palmer or Spartan Davis. Canonically, the events are played from the perspective of human military cadets, reliving the events inside a battle simulation.
Halo: Spartan Assault
The player character is a Spartan IV supersoldier that leads UNSC forces against the Covenant within a combat simulation. During the Covenant invasion of the Earth city of New Mombasa, they sought an artifact known as the Conduit.