In a note posted on Treyarch Studios' Twitter account, co-studio head and zombie mode director Jason Blundell announced his departure. He wrote: "After 13 wonderful and action-packed years, I am leaving Treyarch. During my time at the studio, I was able to work on a variety of projects and wear many hats in the process.

Brandel was a producer on "Call of Duty 3" and became involved with Zombie Mode when he directed two maps in "Black Ops 2."

In "Black Ops 3," he was the director of both Zombie Mode and Campaign Mode, and in " Black Ops 4 (which did not have a campaign mode), where he directed the zombie mode. he has been the studio's co-head since late 2016.

According to reports, Treyarch is working on Black Ops 5 for a 2020 release, following issues with a Call of Duty game developed by Raven that was scheduled for this year.