Watch as developer Treyarch breaks down the lunar invasion of the undead in this new video.

Zombies on the moon?! That's right. In addition to re-releasing the four World at War maps that kicked off the Call of Duty zombie craze, the Call of Duty: Black Ops Rezurrection DLC pack includes a new map that takes the zombie invasion into orbit. Check out the brain hungry astronauts in this video:

The Rezurrection DLC pack is coming to the Xbox 360 on August 23 for 1200 Microsoft Points. Expect the PS3 and PC versions about a month or so later.