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In this 253mb downloadable content pack, Shepard and his team are inserted onto a new asteroid and tasked with stopping it from colliding with a planet. It provides about 90 minutes of gameplay.
To my knowledge this DLC is available for free through BioWare's social site to all PC gamers so it's definitely worth getting a copy of this installed if you're going to do another Mass Effect playthrough. The mission is not that long, doesn't add any new characters and doesn't really push the Mass Effect story any further forwards, but it will provide you with some additional experience and some powerful items.