In the 1930s, masked vigilantes appeared in the United States to take part in the war against the dictators of the Axis. The JSA had to dissolve in 1951, victim of the "Witch Hunt". Its members helped their successors of the JLA and reformed a new "Society of Justice", the JLA. The JLA included: Captain Marvel, Mr Terrific, Sentinel, Dr Mid-Nite, Sand, Hawkgirl, Atom-Smasher, Dr Fate, Flash, Star-Spangled Kid, Power Girl and Wildcat. The J LA includes: Superman, Batman, Aquaman, Wonder Woman, Flash, Green Lantern, J'onzz, Plastic Man, Atom, Green Arrow, Firestorm and Black Canary. What happens when demons embodying the most powerful sins take possession of seven of the most valiant heroes among the two most powerful teams in the world? Destroyed by internal struggles, the JLA and the JSA stand before a demonic alliance that threatens to overthrow the global balance. The greatest alliance of heroes ever held back in history!