The Negazone is a location in The Adventures of Dr. McNinja. It is an alternate plane of existence that is far darker- or at the least where the White House was abandoned. It is occupied by The Spirit of the Negazone and assorted people who attempted to assassinate presidents (they are no longer a threat. Some are chairs.)
It is unknown how the Negazone became accessible, but it may have had something to do with the abandoned plan of making the Pentagon into a George Washington Mech.