Despite this seemingly being a warning to Batman concerning a terrible future phenomenon, the events of Knightmare never came to pass as Superman and Batman teamed up to defeat Doomsday, meaning Superman would never become a tyrant and the Regime would never come into existence.
At some point in a possible future, Lois Lane was killed by Darkseid, with Batman having been unable to prevent it. Superman, unhinged with grief, was left susceptible to Darkseid's Anti-Life Equation and became a malevolent tyrant ruling the planet. He presumably recruited the Regime stormtroopers to aid him in his totalitarian reign of Earth, mercilessly killing anybody who opposed him. Batman promptly founded the Insurgency in order to combat this new threat, thus beginning the long Injustice War.
After years of fighting, an aging Batman, now living in a bunker, heard news of his Insurgents finding a Kryptonite rock, the only remaining hope of defeating Superman. He ordered it be brought to him immediately, but was met with Regime Stormtroopers disguised as Insurgents. It is not clear whether they intercepted the convoy or if it was a hoax all along. Regardless, when Batman asked to see the Kryptonite, they opened their box to reveal only green light bulbs. They apologized to him and held Batman at gunpoint. He followed through with their commands as the undercover Regime soldiers revealed themselves to Batman and the Insurgents. They
executed them as Batman watched helplessly. Angered, he began a killing spree and gunned down multiple stormtroopers, while helping some of his surviving insurgents escape the area. Although he managed to take down most of the Regime soldiers while Parademons invaded the area and abducted many of his allies, Batman was eventually overwhelmed by the remaining soldiers there who could barely restrain him. He snapped one of their necks, but then was brutally (but barely) beaten by the other stormtroopers. Seeing the damage that Batman was inflicting on the stormtroopers and their inability to restrain him, a Parademon knocked Batman unconscious.
With Batman restrained, the Regime quickly informed Superman himself, who immediately flew as fast as he could until he landed in the bunker Batman was held in, just as he regained consciousness. Superman's Regime soldiers reverently knelt before their leader as he approached Batman, swiftly murdering the other Insurgents with his heat vision. Superman then unmasked the visibly horrified vigilante. He expressed his anger at Bruce for letting "her" die, as she was "his world." Superman gave Batman one final sinister sneer, and ruthlessly killed him by tearing Batman's heart from his chest, thereby ending the Injustice War, Darkseid's Regime victorious at last.
- Justice League † - victims