Young Billy Batson was granted amazing powers by the wizard Shazam to fight evil in all its forms. Drawing power from ancient beings (Solomon's wisdom, Hercules' strength, Atlas' endurance, Zeus' power, Achilles' invulnerability and Mercury's speed) he has but to call Shazam's name to be transformed from a young teenager, reporter for WHIZ radio, to the mature and mighty Captain Marvel. Recently he discovered his sister, Mary, the two of them having been kept apart for many years, and has shared the power with both her and a friend called Freddy, who was injured at the hands of the evil Captain Nazi.
Captain Marvel is widely regarded as one of the purest, most upstanding heroes there is - his soul was certainly enough to send the demon Neron packing. He was recently a member of the JSA for a short time, where (as Billy), he began a relationship with Stargirl. However, the older heroes did not fully understand this relationship, and he left the group.