The MDT, or Teleporter, is an interactive object found in Der Riese, Kino der Toten, "Five", Dead Ops Arcade, Call of the Dead, Shangri-La, Moon, The Giant, Der Eisendrache, and Revelations. They were being built by Ludvig Maxis and Edward Richtofen along with their secret weapon, the Wunderwaffe DG-2. However, they were having many problems with the teleporters even at the point when Maxis and his daughter were sent to Griffin Station. Somehow these problems were fixed by the time Richtofen and the others returned.