The Covenant is attacking earth and Master Chief must come to the rescue before they completely wipe out humanity and take over the planet. Fight alone or with a team to save the planet from a gruesome demise. Halo 2 starts off where the original Halo left off. The primary character is still Master Chief and the aliens are back and stronger than before. Play in single player mode or with a group of friends in multiplayer mode. Take the multiplayer mode to the next level on Xbox Live, playing to defeat the aliens with fellow soldiers from all over the world.