Halo 4 will pick up exactly where Halo 3, the last game in the series chronologically, left off—sort of.

You see, it takes place five years after Halo 3's ending, which saw the Master Chief locked in cryogenic sleep as his heavily damaged spaceship floated lazily toward an unknown planet.

"We pick up where that left off. You're going to go down to that world, and there you're going to be introduced to a bunch of new mystery, but also to a new adversary," O'Connor told us. "The new adversary are the Prometheans, and they bring with them a lot of story obviously but also elements that we add to the Halo sandbox."