The Hall of Doom was the secret headquarters of the modern incarnation of the Injustice League. Nestled somewhere in a hidden location in the middle of Slaughter Swamp, the Hall of Doom stood as the counterpart to the Justice League's Washington-based headquarters, the Hall of Justice. The League used this base for only a brief period of time. During the "Lightning Saga", it became a temporary haven for the time-displaced Triplicate Girl who encountered the Justice Society of America and the Justice League of America while on a mission for her own team, the Legion of Super-Heroes.