When Darkseid and his Parademons invaded Earth, Green Lantern asked Barry to help he and Batman fight Superman. At first he was hesitant, but he eventually arrived and was surprised when Superman was actually able to hit him. Batman stops the fight and explains they were really there to learn about the Parademons. When the Mother Boxes open Boom Tubes and let more Parademons out, they are soon joined by Aquaman, Cyborg, and Wonder Woman. Eventually, they are able to send Darkseid back to his world and win the battle. After defeating Darkseid, the Flash joined the others in forming the Justice League.