A new hero known as Shazam, Sean Astin, bursts onto the scene with a polite, almost implausibly calm demeanor that draws media attention. Yet the public story hides a deeper truth: he is Billy Batson, Zach Callison, a young orphan who longs for a real family even as he discovers powers that set him apart from every other kid his age.
Superman, Nolan North, confronts the threat posed by the Monster Society of Evil, a sinister group plotting to steal food for their master, Mister Mind Greg Ellis. In response, the Man of Steel calls in the Justice League—[Troy Baker] Batman, [Grey DeLisle] Wonder Woman, [James Arnold Taylor] The Flash, and [Cristina Milizia] Green Lantern—to confront the looming danger and to assess whether a novice like Shazam could truly stand with them.
Seeing unshakable promise in the boy-turned-hero, the League invites Shazam to join them at the Hall of Justice. Yet he hesitates, fearful that their acceptance will waver once they learn his true age. He travels instead to the Rock of Eternity to seek guidance from The Wizard, [Ralph Garman], who urges him to be more open to the team and then sends him on a mission to investigate a rising disturbance that has the world’s attention.
At the Monster Society’s lair, Mister Mind captures the League and uses a serum crafted by Dr. Sivana [Dee Bradley Baker] to alter them into children, rendering them vulnerable to his mind-control powers. Batman, immune to the trance, escapes to the Batcave with Shazam’s help. The Dark Knight is wary of the newcomer, so Billy Batson reveals his secret identity and shares his origin story: after helping Batman in a duel with Two-Face, Billy continues to do good, aided by a magical subway ride and a train that transports him to the Rock, where he finally meets The Wizard in person. The Wizard explains that he had disguised himself to test Billy’s heart and determine if he was worthy to become his champion after Black Adam, [Imari Williams], fell from grace and was sealed away.
Empathizing with this restless boy, Batman offers trust and friendship, and the two form a tentative alliance.
Around the world, the mind-controlled Leaguers siphon food for Mister Mind. Batman and Shazam locate the others and free them, and the League storms the Society’s lair, fighting their way to Mister Mind. They discover the mastermind has transformed into a colossal moth monster. The group makes a desperate bid to escape to the Rock of Eternity for help from The Wizard, but Mister Mind follows and begins to devour the Rock, a move that inadvertently frees Black Adam to re-enter the fray.
Adam turns the tables by wielding his magic lightning to depower Mister Mind, shrinking the moth-like creature to a caterpillar and sending him into space. Furious, Adam targets The Wizard, forcing the League to flee back to Earth. They brace for the inevitable confrontation, adapting their vehicles to their reduced ages.
Arriving on Earth, Adam overwhelms the League. Remembering The Wizard’s counsel and Mister Mind’s earlier weakness, Shazam uses his lightning to share his powers with the team, boosting their abilities and returning them to their full age. The reveal of Billy’s dual identity to the others is met with calm acceptance—age is no barrier when doing the right thing. The League, now empowered, defeats Adam, who is depowered and captured, while Billy’s sister Mary Batson [Jennifer Hale] and Uncle Dudley are joyfully reunited with him.
In a mid-credits moment, Lobo [Fred Tatasciore] secures Mister Mind for an astonishing bounty, hinting at new adventures and challenges to come.
