During the battle of Slade's Titans against the Justice League in Khandaq, the battle was stopped by Isis, who forces them to choose between leaving or continuing the fight and starting "World War III". The Justice League chose to retreat and Slade retrieves a sample of Supergirl's Kryptonian blood. Upon returning to the labyrinth, with his workers, Doctor Sivana and Doctor Impossible, Slade reveals to the Titans that their efforts support creation of a diabolical invention called the "Methuselah Device" for his dying son Jericho.