Atlanteans are the citizens of the under-water kingdom of Atlantis, with their king being Aquaman, Arthur Curry, a half-human Atlantean hybrid.
The Atlantean Army fight alongside their leader against the Justice League and hold the entire world's ports hostage before retreating on their king's command after Atlantis itself is threatened.
Injustice: Gods Among Us
After Aquaman signs a treaty that effectively gives Superman dominion over Atlantis, the army is now under Superman's control. The Atlanteans invade and attack Metropolis during Superman's insane rampage, but the heroic alternate Superman successfully drives them back with aide from Wonder Woman, who now leads the reformed Amazons.