The year is 2552 and faster than light travel is present. Alpha Halo, destroyed and Installation 01 still standing, becoming mummified by a destructive species known as, the Flood. As Alpha Halo is in pieces, the monitor continues to float endless into the nothingness of space, simply wanting the deletion of humanity and is off towards a planet known as Upsilon. This planet, is located in the Omicron system more far from earth, which is a good thing for the marines. Yet, this planet is colonized with civilians and under attack by the Covenant. The marines from Installation 01 was called to help out on this mission. It is a fight of AIs, humans, and Covenant in this massive planetary war filled with heart-pounding action.

This storyline is a supplementary SL, or an off subject storyline. It does not deal with the true Halo story and many things, such as planet Upsilon and the Omicron system are all complete false statements. But, this is how supplementary story-lines are. They always have some sort of 'twist' into them.