
Earth is burning and mankind may not survive. A race of terrorizing machines, known only as Reapers, from beyond known space has invaded our home planet and left a trail of destruction in its wake. With civilization on the brink of eradication, an Alliance Marine, Commander Shephard, is the last hope for humanity's survival. He must rally civilizations from around the galaxy to launch one final mission to take back Earth and save the human race from annihilation.