After-Universe

From TARDIS Index File, the free Doctor Who reference.

The After-Universe is the universe that will exist after the destruction of ours. Like E-Space, this reality has a green tint to it and is filled with green barren planets and green stars. The only known inhabitants of this universe is the Zytragupten. (DWM: The Stockbridge Child)

Saraquazel was also from this universe. (MA: Millennial Rites)