The Earth is under destruction and most of it is burning. Somewhere out there, in what we have so far called "Unknown Space", there is an alien race whose purpose is to destroy everything that remains from our world.

You are Commander Shepard and the only way to take back what belongs to the humans is to gather all the races, cooperate, and execute one final mission to destroy the enemy. Whether you will succeed is in your hands. The Earth is burning, will you make it in time?