The Void

The Void is the name for the mysterious location in between Realities.

As described in one of Dr. Nero's audio entries, he states "Things that couldn't happen end up in the Void. Things from other dimensions that never existed, or never came to be, or were destroyed, end up there. It makes no sense due to everything that is-- never was."

It affects all Realities, keeping them balanced and housing Void Travelers.

It is also the explanation for supernatural occurrences in most Realities as well as the main issue in Unidentified. Due to its none-existence, Void Travelers constantly have to keep reigning in the effects the Void has on their Reality.