Hey, that looks like Master Chief in Halo: Reach

If you’ve dug through the Halo: Reach unlocks, you’ll know that Master Chief’s voice is something you can eventually get. That’s not what this is about. Instead, it’s a video from Achievement Hunter that shows what appears to be a last-minute appearance by the face (or, helmet) of the series.

You’ll definitely want to avoid watching this until you have completed the single-player campaign, as the footage shown is literally the last few moments of Reach.

Master Chief Makes A Cameo In Reach? [Game Informer]