Treyarch is teasing the return of the popular Zombies mode in Call of Duty: Black Ops 4. Treyarch’s Twitter account has tweeted an image stating "Mankind's reckoning will be its salvation" and "So it begins... #Zombies." The tweet also features a number of strange symbols, (which are believed to be alchemy symbols) along with a mysterious decaying figure removing an ominous mask. More details are expected to come on May 17 during the Call of Duty: Black Ops 4 community reveal event.