Mass Effect 3 (Xbox 360)

Mass Effect 3 details the adventures of Systems Alliance Commander Shepard as they try to defeat a human-survivalist paramilitary group called Cerberus and a synthetic-organic race of machines known as the Reapers. The Reapers are immensely powerful and purge the galaxy of all advanced sapient life in 50,000 year cycles. In the Mass Effect 2 DLC Arrival, Shepard travels into Batarian space to rescue an Alliance deep cover agent named Dr. Amanda Kenson and learns that the Reaper invasion is imminent. To delay them, Shepard is forced to destroy a mass relay, obliterating the system and killing 300,000 Batarian colonists as collateral damage. Consequently, Shepard is ordered back to Earth with the Normandy impounded