That depends on which Call of Duty you are referring to. A zombie mode is present in Call of Duty Black Ops and COD World at War. You don't have to buy anything other than the game, these modes are included.
you need to buy it
It is illegal to download "Nazi Zombies" for free. You can buy the disc for "Call of Duty World At War" and "Nazi Zombies" is on it.
No Zombies are a development of Treyarch for Call of Duty World at War and Call of Duty Black Ops and is not part of Call of Duty Modern Warfare 2 designed by Infinity Ward
Call of Duty : World at War and Call of Duty : Black Ops both have nazi zombies modes.
I believe Treyarch have released a statement saying that there will be Zombies in Call of Duty: Black Ops. Whether they are vietnamese, I don't know..
you need to buy it
Call of Duty world at war Zombies on iPhone
no Call of Duty for PS2 has Zombies
Yes and no. Yes, you do have to buy the map packs for zombies. No, world at war zombies is unlocked when you beat the campaign.
there are no ghosts
no stupid, its a cod exlusive
Call of Duty Modern Warfare 2 does not have zombies.
It's "Call of Duty: Modern Warfare 2" and no, there will not be Nazi zombies in it. That is in "Call of Duty: World at War".
u carn't do nazi zombies on call of duty 2
no, the oldest game in the call of duty series with zombies is World at War.
I think its a dlc.
yes. definitely