Halo 2 (2004)

Halo 2 takes place after the events of Halo: Combat Evolved. (Obviously) The Chief returns to Earth only to find it under attack. The Covenant has also found the Dreadnaught, an ancient Forerunner battle ship. The Prophet of Truth (the Covenant's leader) launched this attack planning to wipe out the human race. Halo 2 also features a new character, the Arbiter who has a dark and twisted past. he becomes the best soldier in the Covenant empire.

This game also features increased graphics, voice acting, NPCs, and weapons. (Non Player Characters)