The film continues the story of teenage Billy Batson who, upon reciting the magic word "SHAZAM!" is transformed into his adult Super Hero alter ego, Shazam.

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.

When the boy hero Shazam is offered to join the Justice League he is reluctant about it, but when his rivals the Monster Society put the League in peril he's the only one who can save them.

A newly fostered young boy in search of his mother instead finds unexpected super powers and soon gains a powerful enemy.