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As players finish rounds, they can hear Richtofen's progress throughout the events of Richtofen's Grand Scheme, or the Big Bang Theory from Call of Duty: Black Ops. This map also occurs simultaneously with the events of Moon, as zombies have yellow eyes to begin with, but eventually change to blue to signify Richtofen's control of them additionally, Samantha's voice can be heard at first when collecting power-ups, but over time, Richtofen's is heard instead. The map's events are set following the nuclear explosion after a multiplayer game ends on the multiplayer map from Call of Duty: Black Ops, Nuketown, with buildings and other environments demolished as well as the nuclear fireball of a "mushroom" cloud seen outside the map. The map's main playable factions are the CIA and CDC. It is based on Nuketown, a multiplayer map from Call of Duty: Black Ops and Call of Duty: Black Ops II. Nuketown Zombies, also known as Nuketown in-game, and Nuke'dTown Zombies! in concept art, is a Zombies map that is featured in Call of Duty: Black Ops II, and the thirteenth Zombies map overall. Upon arrival in Nuketown the agents lose communication with Hangar 18 and become stranded…setting the stage for Nuketown Zombies." - Season Pass map description The zombie soldiers attack the radiation scientists and turn them, and after receiving a distress signal, the base in Nevada sends in CIA and CDC agents to investigate. A group of radiation scientists are investigating the Nuketown remains and discover soldiers that have been revived by Element 115 from a nearby Nevada base. " Nuketown Zombies is set during the events of Moon, and after the end of the multiplayer level from the original Black Ops game.