Earth is under attack by a monstrous race of gigantic living ships known as the Reapers. Even if Commander Shepard could unite all surviving species in the universe, only a miracle can help. Then again, Shepard did come back from the dead.
Super-soldier John-117, Master Chief of the United Nations Space Command, must battle a genocidal alien race known as the Covenant following his violent crash-landing on Halo, an ancient and mysterious ring-world.
After being revived from death and having to join a pro-human organization without a choice, Commander Shepard must assemble a team, battle a new threat, and make tough choices in order to save the galaxy from total annihilation once more.