When Brainiac arrives on Earth to catalog and erase its civilizations, he unknowingly triggers a chain reaction of hidden threats, cosmic warnings, and metahuman crises that force Batman, Superman, Wonder Woman, The Flash, Green Lantern, Aquaman, and Martian Manhunter to unite for the first time—alongside unexpected allies Booster Gold and Supergirl—forming the Justice League to stop an invasion that spans time, space, and memory itself before Earth is reduced to another preserved artifact in Brainiac’s collection.
