User blog comment:Damac1214/Black Ops II - DLC 5 Rumors surface/@comment-180.252.68.171-20130624094026/@comment-173.58.104.118-20130626161205

In order to explain how the groups time warped to various times and places:

Richtofen and Maxis invented the teleporters, and Richtofen stated explicitly in Kino Der Toten's introduction "Who knew the MDT (Teleporter) was capable of time travel?". This insinuates that the MDT is capable of going in either direction of time travel (insinuating again, that if they went back far enough, we could fight zombies and dinosaurs at the same time.)