User blog comment:Magma-Man/Call of the Dead confirmed! Escalation Trailer Out!/@comment-3426464-20110421202214/@comment-2192318-20110422004057

@ Sniperteam82308: Treyarch is to lazy to make actual trailers for the Zombie maps like the epic trailers from World at War. Same goes for multiplayer maps; they just made a montage of battle scenes.