Mary Marvel is a fiction character, a comic book superhero, originally published by Fawcett Comics and now owned by DC Comics. Created by Otto Binder and Marc Swayze, she first appeared in Captain Marvel Adventures #18 in (December 1942). The character is a member of the Marvel Family of heroes associated with Captain Marvel.
She is the alter ego of teenager Mary Batson (adopted name Mary Bromfield), twin sister of Captain Marvel's alter-ego, Billy Batson. Like her brother, Mary has been granted the power of the wizard Shazam, and has but to speak the wizard's name to be transformed into the superpowered Mary Marvel.
Mary Marvel was one of the first female spin-offs of a major male superhero, and predates the introduction of Superman's female cousin Supergirl (also created by Otto Binder) by more than a decade.
Mary Marvel was introduced into Fawcett Comics' Marvel Family franchise a year after a young male counterpart, Captain Marvel Jr., made his debut. Artist Marc Swayze based Mary Marvel's design and personality upon American actress Judy Garland. Mary was introduced in Captain Marvel Adventures #18 as Mary Bromfield, a girl who discovers she is the long lost sister of Captain Marvel's alter ego Billy Batson.
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Official Site: DC Comics
Links: Mary Marvel's Wikipedia Entry Mary Marvel: SHAZAM Heroine Marvel Family's Who's Who?