Mass Effect 2: Overlord

Dispatched to investigate a Cerberus research base that has gone mysteriously quiet, Shepard arrives to find it overrun by geth. The lone survivor, Chief Scientist Archer, lays out a grim situation: an experiment to merge a human volunteer with a virtual intelligence has produced a dangerous hybrid "VI overlord." Now rampaging, the VI has already struck three other Cerberus bases, seizing any technology it can find in a bid to break free — and loosing geth across the planet. Unless Shepard can breach the VI's fortress and shut it down, the murderous intelligence will beam itself off-world to wreak havoc on other systems. The mission plays out across five new level areas and adds two new achievements.