Z-?? is a universe located outside the Z-Multiverse. It was strangely isolated from other universes before the events of The UNIverse.
It seems to take place at least 100 Irken years after a great apocalypse in 2016(Irken Time).
This apocalypse wiped out Earth,Vort,and the Irken empire. It also caused Irkens to become an endangered species,and Vortians and Humans to go extinct.
It is now drifting into the Gakora-9 Multiverse,and is suffering major rifts and anomolies.