Doom Slayer, Hell Walker, Scourge of the Shadow Realm. He is all this and more. However, after retrieving the crucible from Hayden, the energies of hell throw the devil of the red planet back in time. Back to when vampires walked the earth and organizations were formed to hunt them. How will the men and women handle the man who has torn apart hell several time?

Cortana and The Master Chief float aimlessly through space. What happens when a foe turned friend tells Cortana about the world they left behind. A Human/Covenant unity called the Systems Alliance, the wonders of their technology, and the discovery of a Prothean Archive on Mars. This new ally also speaks of another group of races under the banner of the Citadel Council.