After they crash-land on an artificial ring-world called "Halo", a navy captain, his surviving marines, and a chemically-and-surgically-enhanced super soldier named John, Spartan 117 "Master Chief" must find out what the Covenant, the genocidal alien race they are at war with, are looking for on the ring. However, when the Master chief finds out their plan, it was something that they did not expect. The covenant and the human are not alone on halo.

After they crash-land on an artificial ring-world called "Halo", a navy captain, his surviving marines, and a chemically-and-surgically-enhanced supersoldier named John-117 "Master Chief" must find out what the Covenant, the genocidal alien race they are at war with, are looking for on the ring. However, Halo holds more secrets than either side imagined.