User blog comment:Damac1214/Thoughts on the Black Ops 2 Zombies series/@comment-1639863-20130713131717/@comment-1055346-20130714142800

I refuse to believe the "Purgatory" the characters are sent to isn't the Zombies univerese. The prescence of Perks, the Ray Gun, Pack-A-Punch, the Mystery Box, etc. are enough to convince me.

My thought is that MotD is an unrelated prequel story, similar to Five.