Justice League of America [JLA; Aquaman [Arthur Curry; Orin]; Green Lantern [Hal Jordan]; The Flash [Barry Allen]; Wonder Woman [Diana Prince]; Batman [Bruce Wayne]; Green Arrow [Oliver Queen]; Superman [Clark Kent; Kal-El]; Martian Manhunter [J'onn J'onzz] (flashback only); Snapper Carr] (all cameo); The Atom [Ray Palmer]; Jean Loring; Dr. Light [Arthur Light] (villain)