 In the final scene, the JLU runs down the stairs in groups. These  groups correspond to different versions of the Justice League in the  comics or different superhero groups. The first group made up of  Hawk and Dove, Question, Creeper, and Captain Atom are all creations  of writer/artist Steve Ditko. The second group made up of Stargirl  and STRIPE, Crimson Avenger, Shining Knight, and Vigilante are all  members of the Seven Soldiers of Victory. The third group which  contains Hourman, Doctor Midnite, Wildcat, and Doctor Fate are all  members of the JSA. The fourth group which had Vixen, Steel, Vibe,  and Gypsy are all members of the League from the "Detroit" era. The  fifth group of Booster Gold, Elongated Man, Fire, and Ice hail from  the Justice League International. The sixth group which contains  Zatanna, Red Tornado, Black Canary, and Green Arrow are all part of  the Leagues "Satellite" Era. The final group is the "Big 7":  Superman, Wonder Woman, Batman, Flash, Green Lantern, Hawkgirl, and  Martian Manhunter.