Sovereign has been destroyed and the Citadel has been saved, but the reapers are still a threat. Shepard and his crew onboard the Normandy are tasked with finding all they can about the Reapers and ultimately defeating them.

If you're reading this, then either the combine have been beaten, or im dead. I am the last remaining member of a secret military unit, designed specifically to counter this sort of threat, a threat like the combine. This is my story.

In the wake of the resonance cascade, a small group desperately tries to reach the surface and escape.