Billy Batson Shazam: World's Mightiest Mortal is Back (DC Comics)

Young Billy Batson has a secret: the magic word Shazam! transforms him into the World's Mightiest Mortal!
Evil 14-year-old Theo Adam has returned to Earth from his banishment. But Theo can't remember the magic word that gives him the superpowers and form of Black Adam. So he decides to follow Billy Batson and steal the secret word from him!