Ben Affleck: Bruce Wayne/Batman Gal Gadot : Diana Prince/Wonder Woman
Ezra Miller : Barry Allen/The Flash Ray Fisher : Vic Stone/Cyborg
Jason Momoa : Aquaman Luke Evans : King Orm
Keith David : Vulko Aaron Paul : Guy Gardner
Amber Heard : Mera Jeremy Irons: Alfred Pennyworth
J.K. Simmons: Commissoner Gordon Patrick Wilson: The American President Willem Dafoe as Captain Nathaniel Adam
-A U.S. submarine is on patrol when it receives an alert to an incoming threat. Opening fire, it destroys the unidentified object, revealed as an Antlantean structure.
-On the surface, Bruce Wayne and Diana are hard at work in the Batcave investigating the files they stole from Luthor in BvS. Bruce’s nightmares have convinced him he needs to build a League of heroes to stand against future threats, especially now with Superman dead. Diana agrees that in the mythological times, this is what was always done to face the threats no one hero could handle alone.
-Little do they know, but the government has also seized the same video files as part of the investigation preparing for Luthor’s trial. The President of the United States has his own plans to unite the heroes to work for the U.S. Along with newly appointed Head of Supernatural Affairs Cpt. Nathaniel Adam, he tasks elite CIA agent Guy Gardner to take his team and bring the metahumans in line.
-Back beneath the sea, the submarine sends out divers to investigate the mysterious structure. Suddenly, they are attacked and killed by a squad of Antlantean soldiers. Only one is taken prisoner. Footage of the attack is immediately relayed to the Adam, who connects it at once to Aquaman and puts the Navy on high alert.
-The human prisoner is brought to Atlantis and placed before King Orm. Though the sailor tries to feign apology, Orm rails against the surface world for polluting their oceans and now outwardly attacking his people. Orm’s brother Arthur tries to talk him down, but Arthur’s lover, General Mera, insists retribution must be made. Both brothers seek advice from their mentor, Vulko, who informs them that he cannot make the decisions of a king. Orm then declares war on the surface world.
-Unaware of the crises brewing, Diana and Bruce break up in their mission to recruit the mysterious heroes. As Batman, Bruce locates the S.T.A.R. labs facility ran by Silas Stone and infiltrates it “Mission Impossible style”. He is confronted inside by Dr. Stone himself, but gives a rousing recruitment speech, prompting Victor to come out of the shadows, eager to help save the world.
-In Central City, Diana is having more trouble locating The Flash. Donning her Wonder Woman attire, she causes a ruckus, resulting in The Flash swopping in to “stop” her. After a brief scuffle, Diana explains the situation and Flash immediately signs up, partly to help protect people, partly because he thinks Wonder Woman is hot. However, this scuffle has also attracted the attention of Guy’s response team, who crash the party, but are quickly disarmed by Flash, before he and Wonder Woman leave together.
-In the Batcave, the first four heroes of a makeshift League meet for the first time. Bruce is bothered by the youthful enthusiasm of the new recruits, as they remind him of the lost past Robins. Diana sees only potential, however. Alfred gives Barry’s homemade suit an upgrade while the speedster and Cyborg rapidly become best friends. Bruce quickly turns the focus to finding Aquaman, but a news report shows they may not have to look far. The Eastern sea board is under attack. By water.
-A badly embarrassed Guy Gardner complains to his bosses that he didn’t have the firepower to fight metahumans. Cpt. Adam reminds him his purpose isn’t to fight them, but to unite them. This is all interrupted by the reports from the seaboard. The President gives Adam authority to utilize their full stockpile of exotic weapons to stop this new threat.
-Commanding the seas, Orm once again turns down his brother’s pleas to stop, declaring that Arthur’s weakness towards his human ancestry is why he can never be king. Vulco, meanwhile, tells Arthur to follow his heart. He bids farewell to Mera and leaves.
-The fledgling League arrives to Gotham and Metropolis, which are bearing the brunt of the attacks. Commissioner Gordon is supervising the evacuation of Gotham. When the League appears to help, he distrusts them, his relationship with Batman no longer what it once was. But when government forces fail to arrive in sufficient force, he begrudgingly accepts their help.
-On a military black site, Guy and his team are like kids in a candy store, suiting up with an array of outlandish and other-worldy weapons. Task Force X is mentioned as having been dispatched to another city. Guy finds a Green Lantern ring, which he commandeers, dubbing himself “Power Ring”. As he leaves, however, he is confronted by Adam, who transforms into Captain Atom, revealing himself as Earth’s first superhero, now retired, but ready to go into the fight one last time.
-In Gotham, the heroic quartet is struggling to work together as a team to stop the onslaught of waves, lightning, and sea beasts, all while getting the civilians to safety (Including ever-risk-taking reporter, Lois Lane, who refuses to leave) However, the government heroes show up, now led by Captain Atom, and order the League to stand down. To his teammates horror, Batman agrees.
-Retreating away from the frontlines, Diana and Bruce bicker about his leadership capabilities. The argument is interrupted when Aquaman crashes the scene. After a quick fight, he explains his purpose: That Orm is simply misguided, and they must bring both sides to peace before all out war breaks loose.
-Little does Arthur know, it is too late to stop the war. Mera puts her army into march towards Gotham, but confides with Orm that she doesn’t want to fight Arthur. Neither does he, Orm assures her. The Antlantean army attacks in full force, overwhelming the government team while struggling to maintain minimum civilian casualties. Vulko saves Lois and Gordon but Captain Atom misunderstands and attacks him. He is critically wounded and flies off before detonating, seemingly killing Vulko and decimating the Antlantean army.
-The loss of his mentor and destruction of his army, however, only pushes Orm over the edge. He unleashes his full power, no longer caring about collateral damage. Guy stands alone, beaten, with a ring he doesn’t understand and is fighting his control. Just in the nick of time, however, the Justice League arrives. They unite and are able to ultimately defeat Orm.
-In the aftermath of the battle, Orm is arrested, against Aquaman’s attempted plea of diplomatic immunity. The press swarm the heroes, and Flash officially debuts their code names and dubs them “The Justice League”, all to Batman’s chagrin. A memorial is held for Captain Atom, Bruce regrets he was unable to join the League. Despite the heroes refusing to work under governmental control and Batman refusing “Power Ring” a place on the team, the President caves to public opinion and endorses them. Now King, Aquaman returns to Atlantis with Mera, only to be confronted by a shockingly alive Vulko, who reveals himself to have been the alien agent Steppenwolf all along. He flees, and Aquaman rushes to warn the rest of the League. They, however, have even worse news. During the battle, Clark Kent’s grave was robbed. The body of Superman is gone!
TO BE CONTINUED…
Mid Credits Scene: Guy’s ring has finally accepted him as a host after his stubborn display of courage in Gotham. However, as he leaves work in the middle of a storm, he is confronted by Green Lanterns Hal Jordan and Jon Stewart, looking for an errant ring.
Post Credits Stinger: Time space is warped and twisted as an energy form passes through a wormhole before crashing out, revealing an utterly disoriented Captain Atom. Not sure where or when he is, he is horrified to witness the full force of Apokolips, as Steppenwolf unveils a resurrected and decidedly unfriendly Man of Steel to an approving Darkseid.