William Joseph "Billy" Batson, also known as Captain Marvel or Shazam (/ʃəˈzæm/), is a fictional superhero alter ego of Billy Batson, a boy who, by speaking the magic word "SHAZAM!" (acronym of six "immortal elders": Solomon, Hercules, Atlas, Zeus, Achilles, and Mercury), can transform himself into a costumed adult with the powers of superhuman strength, speed, flight and other abilities. The character battles an extensive rogues' gallery, primarily archenemies Doctor Sivana, Black Adam, and Mister Mind.