User blog comment:Flamesword300/Could Treyarchs 2015 COD be a WW2 game? I think so/@comment-5591504-20140630190751/@comment-1187559-20140630224617

" I think it would be cool if the campaign had the original characters travel back in time to stop the zombies from being created. " - That's a paradox. If you go back in time to prevent the creation of something, said prevention will cancel out the need to perform the time travel in the future meaning time travel would not take place, leading back to it having to take place. It's a paradox to go back in time to willingly go back in time to have an objective on what to change.