A desperate cry is heard through the galaxy, and Spartan and his forces answer the call. Spartan and his comrades have been licking their wounds for months. Thousand lie dead, and many more wounded following the apocalyptic battle with the treacherous legions of Horta and House Zaime. But when a signal from the scattered Houses is heard from the depths of the mysterious Nebula, Spartan knows he will be forced back into action. Horta...