Justice League [Superman [Clark Kent; Kal-El]; Batman [Bruce Wayne]; Wonder Woman [Diana of Themyscira]; The Flash [Barry Allen]; Mera; Green Lantern [John Stewart]; Hawkgirl [Kendra Saunders]; Martian Manhunter [J'onn J'onzz]]; Perry White; Starman [Will Payton]; Mr. Mxyzptlk; Legion of Doom [Brainiac; Lex Luthor; Thaal Sinestro; Gorilla Grodd; The Turtle (as a baby, also as an adult in flashback); The Cheetah [Barbara Ann Minerva]]; Perpetua; the Monitor; the Anti-Monitor; the World Forger; Future Superman; Future Green Lantern [John Stewart]; Future Flash; Future Martian Manhunter [J'onn J'onzz]; Future Hawkgirl [Kendra Saunders]; Shayne (future son of Hawkgirl and J'onn J'onzz); Future Batman [Dick Grayson]; Future Wonder Woman
Believing that the key to saving the Multiverse is in the Fifth Dimension, the League summons Mr. Mxyzptlk for help. However, Mxyzptlk advises them that their only real hope lies in the Sixth Dimension. Meanwhile, the Legion of Doom continues their plans to revive Perpetua.
Daily Planet; Hall of Doom; Hall of Justice; Multiverse; Sixth Dimension; Source Wall