Mass Effect 3: Citadel will be the final single-player DLC for the game and is bringing back all of your squad mates for one final adventure on the Citadel. Shepard is the target of an attack (big shock) and he calls in all of his friends to fight this new threat.
Watch the trailer above and decide for yourself if you want one last chance to send off these characters. I think I do. The DLC releases tomorrow (March 5th) for $14.99/1200 MS Points.
