The Justice League reunites when Vandal Savage emerges with his Legion of Doom.
Batman works with Martian Manhunter, investigating the theft of Amazo's parts, when they are attacked by Giganta and Shadow. While Superman works with Green Lantern to investigate Intergang, they are surprised by the presence of Solomon Grundy, Atomic Skull, and Ultra Humanoid. Diana is attacked by Doctor Polaris and Poison Ivy while overseeing the construction of the embassy. Flash and Hawkgirl receive the others' calls for help and rescue them. With the seven heroes gathered at the Hall of Justice, they try to understand who is behind the attacks. Batman presumes it's related to the theft of Amazo.
However, even their escape to the Hall of Justice was a trap, when Shadow uses his powers to surround the place, prohibiting any entry or exit without his authorization. Soon the headquarters is invaded by Vandal Savage, who presents his Legion of Doom: Human Flame, Solomon Grundy, Atomic Skull, Ultra Humanoid, Giganta, Poison Ivy, Doctor Polaris, Poison Cobra, and Mirror Master. Initiating an attack against the Justice League. But what are Vandal Savage's true intentions with this siege? Does he have ulterior motives? And what is his secret weapon?
