Download the manual for this game by locating the game on http://marketplace.xbox.com and selecting “See Game Manual". Mass Effect You are Commander Shepard of the SS Normandy, an elite agent in humanity’s Systems Alliance Military. Explore the galaxy with your hand picked squad of combat, tech and biotic specialists as you race against time to stop a madman bent on galactic destruction. Download new systems and worlds to visit! Meet new characters and encounter never before seen alien species! Find new weapons, armor and items as you experience a whole new adventure!