Justice League War

A series of strange abductions have occurred in Gotham City. Video footage suggests that Batman, a wanted, costumed vigilante, is behind the incidents. When a mysterious cloaked kidnapper abducts a woman, Green Lantern arrives to confront the kidnapper and saves the woman when she is dropped from above. Green Lantern then attacks the kidnapper, revealing it to be a monstrous Parademon. The creature defeats Green Lantern soundly, and as he is about to be killed, Batman appears and saves him and tries to ask the parademon questions but the Parademon then attacks both heroes. Green Lantern shocked to see Batman, points his light at him in which attracts the police and Batman explains the world is afraid of them. The Parademon attacks and Batman saves Green Lantern. Batman chases after it and tells Green Lantern to go home, but Green Lantern refuses and tells him that the entire space realm is his to protect. They both chase after it, the creature picks up Batman's scent and spits out fire at him, Batman dodges it and Green Lantern blocks it. Batman then attaches his grappling hook together, but the creature uses it's strength and breaks through, Batman is then smashed to a wall, then Green Lantern snaps the creature's wings and the creature explodes, Batman explains that cops caught it trying to plant a strange bomb, when they confronted it, it spat out fire. Green Lantern and Batman begin walking in the sewers to find the creature, Green Lantern starts asking Batman about his superpowers, but Batman replies he uses technology. He comes to a conclusion that Batman, is a guy wearing a halloween costume, too which Batman smiles. Batman take Green Lantern's ring without his concern, too which GL retrieves the ring and threatens Batman to a fight, too which he pushs GL to the wall and tells to keep quiet. They see the creature planting a mother box, to which GL thinks it's a bomb and tries to stop the creature, when he tried to land a blow, the creature said FOR DARKSEID and it blows up but GL uses his ring to protect himself and Batman. GL aks whether Darkseid was a band, but Batman said it was a death cry and it was trying to protect the mother box. Batman and Green Lantern examine the box, deduce that it is of extraterrestial origin, and decide to ask Superman for an answer.Another Mother Box, supplied by The Flash is being studied at S.T.A.R. Labs. Doctor Silas Stone, father of Vic Stone, deliberately misses his son's football game so he can study the box.

Meanwhile, Batman and Green Lantern fight Superman—who has fought a Parademon previously and believes the heroes are working with it. The battle spreads over a portion of the city; it finally stops when Batman calls Superman "Clark". Superman uses his x-ray vision and recognizes Batman as billionaire Bruce Wayne. The three heroes then begin to collaborate. On planet Apokolips, Darkseid orders Desaad to begin an invasion of Earth in response to the superheroes' discovery of his plans. Vic arrives at S.T.A.R. Labs and argues with his father Silas, who believes that football has no importance in a world that is changing with the appearance of metahumans. At the Daily Planet, Superman, Batman, and Green Lantern realize the invasion has begun when the box activates and several Boom Tubes appear throughout the world, including S.T.A.R. Labs. An explosion fatally wounds and embeds the Box's technology into Vic, forcing S.T.A.R. Labs to take Vic to an emergency room to save him. Silas loads Vic into a hi-tech medical bed, connecting his son with various technologies. Countless Parademons appear around the world, attacking everyone on sight.

The box's technology is connected to Vic and the labs' equipment, transforming Vic into Cyborg. Just as the Flash arrives to save the scientists, Cyborg's systems reveal details of Apokolips, Darkseid, and the invasion plan. At his foster home, teenager Billy Batson sees a Parademon outside and mystically turns into the superhero Shazam. Air Force One is attacked in the air, but is saved by the Amazon princess Wonder Woman (Diana Prince) and Superman. After the heroes gather, Cyborg reveals that the invasion is a prelude to the terraforming of Earth. Darkseid arrives and proves to be a powerful opponent who defeats each hero effortlessly.

Superman is captured. Batman stops Green Lantern and persuades him to help the heroes work together after he unmasks himself. Wayne deliberately allows himself to be captured to save Superman. Green Lantern, acting as a leader, assembles everyone and decides that to defeat Darkseid they must destroy his eyes first, stripping him of his power to use his Omega Beams. Batman arrives on Apokolips and stops Desaad from turning Superman into a Parademon, but because of his brainwashing, Superman goes on a rampage, resulting in Desaad's death. Batman reasons with Superman, helping him reassert his own personality. On Earth, after Darkseid's eyes are disabled, Cyborg connects with the Mother Box to reopen the Boom Tubes and send the tyrant and his army back to their home world. Though the Parademons are gone, Darkseid remains. Superman and Batman arrive and together they force the tyrant into the portal. With the world saved, the once-maligned superheroes gain the public's trust and are honored at the White House. The President of the United States asks whether they have a name. Shazam abruptly announces the name "Super Seven", to which the others object.

In a mid-credits scene, an Atlantean ship emerges from the ocean and Ocean Master appears carrying the body of his king, presumably killed during the invasion, calling it an act of war from the surface, for which he vows retribution.