One month after the devastating geth attack on the Citadel, humanity seized political control of the galaxy. Now the human-led Council is forced to respond to evidence that the reapers - enormous machines that eradicate all advanced civilizations every 50,000 years - have returned. To quell the rumours, the Council has sent Commander Shepard and the Normandy to wipe out the last pockets of geth resistance. Officially, they blame the invasion on the geth and their leader, a rogue Spectre. But for those who know the truth, the search for answers is just beginning...