DLC

The DLC for Mass Effect 2 is rich. There is quite a bit of free dlc .. the rest is sadly purchasable. There are new levels, new weapons, new armour, and new characters. There is even a new ship for various planet side quests. Some of the new levels explore things mentioned in the game, and Bioware has announced that the continued release of DLC will explain the storyline between Mass Effect 2 and Mass Effect 3.