M.P.D.

The M.P.D. is a pyramid-shaped device that controls the zombies. It appears to have been built by aliens and is what drove Richtofen insane. It uses souls as a power source, as discovered by Schuster when he killed a rat. Samantha was originally suspended within it by accident and used it to send the zombies after Group 935 members. Richtofen switched bodies with her to take control of the zombies, but soon the earth's atmosphere was destroyed and Richtofen lost control of the zombies there.