Initially reluctant to join but forced to assemble after Steppenwolf kills his guards and steals their Mother Box. Fights through Parademons and joins the final assault against Steppenwolf. Later meets with Nuidis Vulko and Mera.
Steppenwolf's attack forces Arthur into direct opposition.
Steppenwolf kills Atlantean guards and steals their Mother Box, after which Arthur joins the final assault against him.
They cooperate as members of the final defense team.
Diana and Arthur fight alongside the assembled heroes against Parademons and Steppenwolf in Pozharnov.
Mera is part of Arthur's Atlantean postwar network.
Arthur meets with Mera after the battle before going to see his father.
Bruce makes an unsuccessful first appeal before Arthur joins independently of persuasion.
Bruce seeks to recruit Arthur, but Arthur initially refuses before later joining after Steppenwolf attacks the Atlantean guards.
Vulko remains connected to Arthur during the post-battle transition.
After the battle, Arthur meets with Vulko to discuss preparations for Darkseid's inevitable return.
Explore the full interactive character relationship map of Zack Snyder's Justice League
Related entry on Wikidata (Q56244641), public domain (CC0).