The Reapers have come. Commander Shepard's big "I told you so" moment arrives in a terrifying way: Earth has been decimated, and the rest of the galaxy is being overrun. Current technology can only stave off the Reaper advance, and the disparate fleets of the Alliance and Council races cannot survive on their own. It's up to Shepard to not only try and formulate a plan to save everyone, but to unite all of the species in the galaxy under one banner to try and defeat the Reapers once and for all. It's simple: live together, or die alone. Victory at any cost.