Billy Batson and his foster siblings, who transform into superheroes by saying "Shazam!", are forced to get back into action and fight the Daughters of Atlas, who they must stop from using a weapon that could destroy the world.

Superman finds a foe who may be too powerful even for him to defeat in the murderous Black Adam. Fortunately, Black Adam's real target is the Earth's Mightiest Mortal--Captain Marvel.

10-year-old Billy Batson shouts a single word and, with lightning bolts flashing, he transforms into Shazam!, a full-fledged adult Super Hero. It doesn't take long for Superman, Wonder Woman, Batman and the rest of the Justice League to take notice and invite the earnest do-gooder to join the team. But to become a member, Billy must reveal his true identity. While fighting off the evil Mr. Mind and Black Adam, Billy learns that he must trust others - and that nothing creates trust like helping those in need.

In Philadelphia, Billy Batson is an abandoned child who is proving a nuisance to Child Services and the authorities with his stubborn search for his lost mother. However, in his latest foster home, Billy makes a new friend, Freddy, and finds himself selected by the Wizard Shazam to be his new champion. Now endowed with the ability to instantly become an adult superhero by speaking the wizard's name, Billy gleefully explores his new powers with Freddy. However, Billy soon learns that he has a deadly enemy, Dr. Thaddeus Sivana, who was previously rejected by the wizard and has accepted the power of the Seven Deadly Sins instead. Now pursued by this mad scientist for his own power as well, Billy must face up to the responsibilities of his calling while learning the power of a special magic with his true family that Sivana can never understand.