It gives a glimpse into what could have happen, in typical Wolfenstein-style, if the German scientists had of developed the atom bomb first and used it. The answer? Nazis on the moon.
Of course that pesky American hero B.J. Blazkowicz comes along and totally spoils the fascist wonderland that those jackbooted authoritarians when and built for us.
Wolfenstein: The New Order releases on Xbox 360, PS3 and PC this December.