Undead Labs has revealed a host of details about the second State of Decay expansion pack.
Titled Lifeline, the DLC features a new map and explores the military side of the zombie apocalypse.
Players will take control of a small military unit called Greyhound One, which has been deployed to the fallen city of Danforth to rescue scientists whose research is vital to combating the outbreak.
Undead Labs said in a blog post: "This is at the height of the initial crisis. You still have a chain of command and access to off-map support, but the voices over the radio are making it clear that things are rapidly breaking down.
"So what you end up with is the inverse of the usual progression. Instead of starting with nothing, and slowly building yourself up into a post-apocalyptic powerhouse, you start the game as a well-equipped, well-supported military unit, and then must learn to improvise as one resource after another is depleted...and isn't coming back.
"One of your first imperatives is to secure the Landing Zone where you can receive supply drops and extract civilians. This location becomes your base, which you must defend at all costs against the zombie horde."
While a release window has yet to be announced, Undead Labs intends to launch Lifeline simultaneously on PC and Xbox 360.