"Halo: Combat Evolved! Buy one! Heck, buy two! That's an order, soldier!"
Halo Combat Evolved in the video game on the Xbox and the first game in the Halo frenchise. It is a First Person Shooter.
After the destruction of Pillar of Autumn which Captain Jacob Keyes was in command of, Master Chief Petty Officer John 117 goes on to Halo which is a weapon capable of ending both humanity and the Covenant. The Covenant's goal is to activate Halo without realising it's true power so John 117 decides to save humanity by destroying Halo and stopping the Covenant.