For those who just just can't get enough Mass Effect, the "Bring Down the Sky" content pack has been released today for 400 Microsoft points. This is the first of a series of planned downloadable content that is said to expand the the Mass Effect universe.

"Bring Down the Sky" includes a new uncharted world that introduces the notorious and feared alien race of the Batarians. A Batarian extremist group has 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.

"Bringing Down the Sky" also adds a series of new achievements that'll nab you 50 Gamerscore points.