Fully optimized for the PC, "Bring Down the Sky" is the first in a series of planned downloadable content that will further expand the Mass Effect story and universe. It includes a new uncharted world that introduces the deadly Batarian alien race, approximately 90 minutes of new gameplay and an original soundtrack.

Batarian extremists have hijacked a mobile asteroid station in the Asgard system, setting it on a collision course with the nearby colony world of Terra Nova. Only Commander Shepard can save the millions of innocent civilians before the asteroid completes its deadly descent.