Shazam (formerly known as Captain Marvel) is a superhero in the DC Comics Universe and the protector of Fawcett City. In his secret identity, he is William Joseph "Billy" Batson, a young boy who was chosen to be a champion of good by the wizard Shazam. Whenever Billy speaks the wizard's name, he is struck by a magic thunderbolt that transforms him into an adult superhero empowered with the abilities of six legendary figures.