While no cohesive plot is apparent from the vignette style of the trailer, it can be pieced together that Batman has been murdered, and his killer remains at large. Dick Grayson, long since retired from his superhero days and married to Barbara Gordon with a child, decides to resume his crime-fighting days as Robin; Remarkably, Grayson does not take up the Nightwing identity. The filmmakers said they chose this because many people outside the comic book community are unfamiliar with Nightwing and they wanted to appeal to a wider audience.
In 1989, scientist Hank Pym resigns from S.H.I.E.L.D. after discovering their attempt to replicate his Ant-Man shrinking technology. Believing the technology is dangerous, Pym vows to hide it as long as he lives. In the present day, Pym's estranged daughter, Hope van Dyne, and former protégé, Darren Cross, have forced him out of his own company. Cross is close to perfecting a shrinking suit of his own, the Yellowjacket, which horrifies Pym.
LexCorp's CEO, Lex Luthor, has been elected President of United States during a severe nationwide economic depression. Under his leadership, the economy begins to thrive, and he assembles a force of government-employed superheroes consisting of Captain Atom, Katana, Black Lightning, Power Girl, Starfire, and Major Force. Meanwhile, Superman and Batman maintain their distrust toward Luthor.
Since his last encounter against Batman, Mr. Freeze has found a home in the Arctic and started a family (of sorts) with the still cryogenically-encased Nora, an Inuit boy named Kunac, and two pet polar bears, Hotchka and Shaka. Nora's condition begins to rapidly deteriorate due to a submarine accidentally emerging from underwater directly underneath them, shattering her containment vessel. Freeze returns to Gotham City with his companions. He enlists the help of Dr. Gregory Belson to find a cure. Belson determines that Nora needs an organ transplant, but due to her rare blood type there are no suitable donors available.
During an archaeological expedition to Siam's volcanic Valley of the Tombs to find the lost secret of the Scorpion Kingdom, a device of great power, the Golden Scorpion, is discovered hidden inside a sealed crypt. While examining it, the device's quartz lenses are aligned and powerful energy beam erupts, causing an explosion, resealing the crypt. This allows young radio broadcaster and expedition member Billy Batson, who obeyed the warning on the crypt's seal not to enter, to be chosen by the ancient wizard Shazam. The wizard grants Billy the powers of Captain Marvel whenever he repeats the wizard's name. Captain Marvel's powers can only be used to protect those in danger from the curse of the Golden Scorpion. The crypt's entrance is quickly cleared, then Captain Marvel utters "Shazam"! and quickly resumes his Billy Batson alter ego.
La Ligue de justice d'Amérique est contrainte de faire appel aux services spécifiques de John Constantine et de ses camarades spécialistes de l'occultisme pour contrer une importante menace d'invasion.
During an investigation of missing children, Damian Wayne, still fighting crime as Robin, has taken the Batmobile out to an abandoned toy factory without Batman's consent, where he finds Anton Schott, who is responsible for the children's disappearance and has also transformed some of them into grotesque, mutilated "Dolls". Damian's father, Bruce, arrives as Batman to aid Damian in the resulting battle, with Damian chasing after the Schott while Batman knocks out the Dolls with gas and frees the remaining children. Damian chooses to spare Schott, only for an owl-masked assassin to kill him, telling Damian to never doubt his instincts. The assassin leaves Damian and the Schott's body behind, leading Batman to accuse Damian of murdering him when he arrives. Damian insists he spared Schott out of respect for Batman, and after inspecting the body further, Batman discovers an owl feather.
Batman, Batgirl et Robin forment une alliance avec les Tortues Ninja pour affronter Shredder qui s'est apparemment joint à Ra's al Ghul et sa Ligue des Assassins, afin de pouvoir prendre le contrôle de la ville.
Weeks after the events that led to Lex Luthor's arrest, the impeachment of his presidency, and Batman's success in saving the world from the impact of an arriving meteor, a spaceship lands in Gotham City Harbor. While Batman investigates the sunken craft, a young girl with no knowledge of English or any other human languages emerges from the water and accidentally crashes Batman's boat. Three longshoremen find her where she attacks two of them in self-defense while the third one just gives up his coat to her in order for her to cover up. She accidentally causes all sorts of havoc with her Kryptonian-like powers until the Dark Knight exposes her to a piece of Kryptonite while Superman gives the blimp that she unknowingly used her heat vision on a water landing.
Tucker and Esther Cobblepot, an aristocratic couple, throw their deformed infant child in a river, feeling that Gotham City's high society would not approve after witnessing their son kill their pet cat. However, a flock of penguins living in an abandoned zoo's arctic exhibit connected to the sewers rescue and raise him. 33 years later, the child becomes The Penguin (Danny DeVito) and the leader of the Red Triangle Circus Gang, who appear in Gotham City during the annual Christmas tree-lighting ceremony and cause a riot. As the police and Batman (Michael Keaton) deal with the riot, one of the guests at the ceremony, a prominent businessman named Max Shreck (Christopher Walken), is kidnapped and taken to the Penguin, who desires to become a citizen of Gotham and blackmails Shreck into helping him by threatening to expose evidence of his corporate crimes.
Tony Stark recalls a New Years Eve party in 1999 where he meets scientist Maya Hansen, the inventor of Extremis, an experimental regenerative treatment intended to allow recovery from crippling injuries. Disabled scientist Aldrich Killian offers them a place in his company Advanced Idea Mechanics, but Stark rejects the offer, humiliating Killian.
Before any other sentient beings existed in the universe, a race of beings calling themselves the Guardians of the Universe harnessed the power of the green element, the greatest power in the universe, to create the Green Lantern battery. However, the battery was vulnerable to the color yellow, the one part of the light spectrum that could resist green. The Guardians hid the most concentrated source of yellow energy, the yellow element, to prevent others from using it against them.
The planet Krypton faces imminent destruction due to its unstable core; the result of depleting Krypton's natural resources. The ruling council is deposed by the planet's military commander, General Zod, and his followers during a coup d'état. Knowing that artificial population control and isolationism have ruined their civilization, scientist Jor-El and his wife Lara launch their newborn son, Kal-El, the first naturally born Kryptonian child in centuries, on a spacecraft to Earth after infusing his cells with a genetic codex of the entire Kryptonian race. After Zod kills Jor-El, he and his followers are captured and exiled to the Phantom Zone. However, they are indirectly freed after Krypton explodes, rendering the Kryptonian race extinct apart from Zod and his forces.
In an alternate universe, the Justice League is a brutal force that maintains order on Earth. This universe has its own versions of Superman, Batman, and Wonder Woman: