https://www.cnet.com/news/shazam-dc-comics-movie-zachary-levi-release-date-cast-plot/

Pretending to be a superhero is half the fun of childhood. But what if you could go from being a kid to an adult with god-worthy powers just by uttering a single word?

That's exactly what happens in the upcoming movie Shazam. Young character Billy Batson can instantly change into an adult superhero just by yelling the word "Shazam!"