Tuck, Munch, and Alex are a trio of inseparable friends whose lives are about to change. Their neighborhood is being destroyed by a highway construction project that is forcing their families to move away. But just two days before they must part ways, the boys begin receiving a strange series of signals on their phones. They discover something beyond their wildest imaginations: a small alien has become stranded on Earth.

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.