Mass Effect
part of Mass Effect

The first game in the trilogy centers around a player-created character named Commander Shepard and his/her mission to save the galaxy from a race of mechanical beings known as the Reapers, and its followers, including Saren Arterius. The first game sees Shepard facing Sovereign, a Reaper left as a vanguard, who plans to allow the Reaper fleet currently hibernating in extra-galactic dark space to invade the Milky Way, and destroy all sapient organic life, continuing a mysterious cycle of destruction. The second game takes place two years later, and sees Shepard battling the Collectors, an alien race abducting entire human colonies in a plan to help the Reapers return to the Milky Way. The third and final game centers on the final battle against the Reapers.