Chances are, if you're even slightly interested in Halo: Combat Evolved Anniversary, you already have the gist of the game's plot. Aliens, ancient super-weapon, Master Chief, et cetera. But if you need a refresher, with a spit-shine of visual polish to boot, the new launch trailer fits the bill.

The trailer cuts together story clips, picking up right where last year's Halo: Reach left off. Check it out below.