Since the reveal of Call of Duty: Advanced Warfare’s Exo-Survival co-op mode last month, fans aren’t quite letting Sledgehammer Games off the hook when it comes to the idea of Zombies somehow appearing as a fourth secret mode in the game that the studio isn’t telling us about.

Surprisingly, according to a new batch of images associated with Advanced Warfare’s Achievement and Trophy list, it looks like Zombies may actually play some sort of role in the game after all, but not in its own separate mode.

An administrator at CODForum claims to have discovered this odd image of an Advanced Warfare Achievement/Trophy called “Exo Survivor” which asks players to “Successfully Complete Exo Survival Bonus Wave”. The image in question, however, appears to feature an Exo Suit-wearing Zombie.

As noted in the previously mentioned list, the Achievement/Trophy is only attainable in Advanced Warfare’s Riot map, which happens to be the map showcased in the image above. This leads us to believe that your attackers in a Bonus round of Exo Survival on the map Riot could be a wave of these sinister-looking Zombies.

Zombie survival became a staple of the Call of Duty franchise back when Treyarch introduced them in World at War and made them popular through Black Ops and Black Ops 2. Zombies in Advanced Warfare were heavily rumored about the time Microsoft introduced this Xbox One controller, but excitement for the possibility died down shortly after Exo Survival’s reveal where no mention of Zombies was made.

Only time will tell what sort of role Zombies will play in Advanced Warfare. If not its own separate mode, their possible inclusion in Exo Survival could be a way for Sledgehammer Games to test the water for future DLC.

Stay tuned for updates!

Call of Duty: Advanced Warfare Day Zero Edition launches November 3.