Batman Beyond would've been a better reward for completing the "Nightmare Mode".
IIRC you get this skin by getting a platinum trophy. How in the hell did someone get it already?
During the final "Battle" with the Joker, Batman starts to choke him. Then Joker hallucinates Batman in a Demonic way. I just took a picture and compared it with the one leaked. They were identical. --- Official ''Spamstroke'' of Injustice: Gods Among Us board.