A funny thing happened while I was still digesting the copious amounts of gravy covered turkey and stuffing from Thanksgiving late last week: Sledgehammer Games made its Exo Zombies mode officially known.

The post on the game’s official site comes alongside a genuine upload for the video that leaked a few weeks ago. You can see that video at the head of this post. Apparently, it’s an easter egg for the end of the already included co-op mode.

Sledgehammer has decided to take its Exo suits and slap them on zombies. Here’s the rub.

As things were wrapping up around launch, we started playing around with the idea of what happens when zombies were thrown into the mix with exoskeleton gameplay. What we came up with is Exo Zombies — an entirely new breed of zombies and an entirely new co-op experience that is truly unique to Advanced Warfare.

Sounds absurd enough to work.

This mode will be available as a DLC early next year. It’s coming in the Havoc pack, one that you can pre-buy if you snag the Season Pass. You’ll be able to get the “first chapter” of Exo Zombies with or without the Season Pass, so don’t sweat that fact.