Bring Down the Sky will introduce the alien race of the Batarians, an extremist group that has taken over an asteroid station in the Asgard system, sending it hurtling toward the colony world of Terra Nova. Players will be unsurprisingly tasked with averting the disaster, exploring a new world in the process.

BioWare estimates the scenario will last most gamers about 90 minutes, with 50 Gamerscore points hanging in the balance.

The content--the first in a series of such releases--is coming to Xbox Live on March 10, for the price of 400 Microsoft points ($5).