We hope that you’re enjoying Zombie Army 4. We continue to work hard on Season 3, so while that is still fresh in our minds, it seemed like a good time to give you another “behind the scenes” look at the next round of DLC. Each season features a mix of free and paid content. […]

-- Source: https://news.xbox.com/en-us/2021/06/23/left-4-dead-join-zombie-army-4/