Atlantis

One of the twelve Stages found within Injustice 2 is Atlantis. As the rumors tell, this lost city that was once so advanced is now submerged far underneath the ocean. After the events of Gods Among Us, this underwater utopia has now since cut-off all communications with the surface world. This was done in most part by their king, Aquaman, after Superman's regime finally fell (the man he's always been loyal to). But with an ensuing invasion by Brainiac, this city might have no choice but to join in the fight against him. That, or face the possible risk of being destroyed as well.