Captain Marvel, or sometimes called Shazam, is actualy, 12 year old Billy Batson. Who had met a wizard named Shazam who gave him the power to turn into Captain Marvel. When they bought the character, DC had changed his name to Shazam because of Marvel Comics already having a Captain Marvel...
He, and Wonder Woman, due to their magic nature, are probably the only two DC characters that can go toe to toe with Superman and actually beat him. Well, I know Wonder Woman can...