The Ghost Zone

The Ghost Zone is an alternate form of reality, home to all the ghosts, and made entirely of ectoplasm in the Nickelodeon series of Danny Phantom. The Ghost Zone as a dimension in time-space fluidic phase as portals can naturally form--portals between the Earth and the Ghost Zone, portals to other dimensions, and portals through time and space. The Ghost Zone features a wide variety of locations, all of them accessible through unusual doors that's shape, size, and style usually have something to do with what's through them.