Call of Duty: WWII Nazi Zombies Mode officially revealed at Comic-Con! Straight from San Diego Comic-Con, Activision and Sledgehammer Games have officially released the trailer for the highly-anticipated Call of Duty: WWII Nazi Zombies mode. Check out the reveal trailer in the player below! Sledgehammer Games delivers an original and terrifying new co-op survival experience in Call of Duty: WWII Nazi Zombies.