- "It's really cool you guys seem ready to do battle and stuff, but I've never done battle. I've just pushed some people and run away!"
"Save one person."
"Then you'll know."
- —Batman and Flash
The Justice League receives intel from Commissioner James Gordon that the Parademons are traveling underground, Which the team goes to find, the team climb up, to find Steppenwolf interrogating the S.T.A.R. Labs employees about the final Mother Box, which The Flash gets nervous and tells the team that he hasn't done battle before, which Batman says just save one person.
Steppenwolf then grabs Silas Stone, which Cyborg shots Steppenwolf and saves his father, which Wonder Woman helps out buy attacking the Parademons and taking Steppenwolf to a different part of the factory, while Batman fights the Parademons, Barry goes and save one of the employees. Steppenwolf tells the Parademons that he will deal with Diana alone, meanwhile Batman is being attacked by one of the Parademons which he tells Alfred that he needs the Knightcrawler which he sent the machine to Bruce.
Flash and Cyborg save all the hostage which Silas Stone tells Victor that Steppenwolf can not get the final Mother Box. Batman then jumps down into the Knightcrawler and saves Wonder Woman after a Parademon manages to briefly knock her out. The Knightcrawler gets attacked by Steppenwolf, and Barry helps Wonder Woman get her Sword so she can help Batman.
Flash and Wonder Woman get attacked by Steppenwolf and the Parademons before Batman helps her by killing one of the Parademons. Cyborg then fall into the Knightcrawler and and hacks it so it in his control, which he uses it against Steppenwolf, but falls when Steppenwolf catches a missile and throw it against the wall, which causes the factory to flood which allows Steppenwolf to escape.
After the fight with Steppenwolf, Batman meets with Gordon before Arthur shows up and says that Steppenwolf took the Mother Box from Atlantis, then Victor reveals that he is possession of the final Mother Box, which he hid from his father. The team returns to the Batcave which Barry runs around the cave and sits in the Batmobile, before Bruce call for a meeting with the team. Bruce conclusions that they should use the Mother Box to bring Superman back to life. He believes that they need Superman to restore hope in humanity. Diana and Arthur are hesitant about the idea, but Bruce forms a secret contingency plan.
- Justice League (First appearance)