The running dead return in the new Exo Zombies Infection trailer for Call of Duty: Advanced Warfare, which continues the story of this undead, co-op experience.

Sledgehammer Games' zombie-filled adventure continues. At this point, the four heroes from the previous undead DLC have fled Atlus after being overrun and gone to a place more suitable for their zombie-killing skills: the Burger Town franchise. Now, with the delicious smell of char-broiled meat in the air, you can fight the ever-evolving undead with new guns, traps and allies. The challenge also grows with the objective of not only surviving, but also helping your fellow humans get away from the zombified horde. While you may be decked out in all the best gear, you need to make sure you're always on your toes because the zombies won't be taking it easy on you with their exoskeletons equipped. It's great to see that Bill Paxton, John Malkovich, Rose McGowan and Jon Bernthal are returning in this new DLC.

The first DLC pack for Advanced Warfare, 'Havoc,' which contains the first Exo Zombies story, is already out. The second DLC pack, 'Ascendance,' comes out on March 31 for Xbox Live (with PlayStation consoles and PC getting it later). You can either pay a flat fee of $14.99 for it or you can buy the Season Pass for the game, which will get you all four DLC packs, for $49.99.