MechWarrior 4: Black Knight Expansion

You're back on Kentares IV, and this time, you don't have to play nice. Enlist in the notorious Black Knight Legion, climb aboard any one of five new 'Mechs, and deliver some payback for all the injustices you've been dealt. Put your mercenary skills to the ultimate test in a world ravaged by civil war. Use the new Black Market feature to get the equipment and weapons you need, when you need it. [Microsoft]