Mary Marvel

Mary Marvel is a comic book character originally created by Fawcett Comics and eventually bought by DC Comics.

She is part of the Captain Marvel franchise and is a superheroine with similar superpowers as her brother, Billy Batson.

History
Separated as a baby from her twin brother, Billy, Mary was adopted by a rich family and was not aware of her origin.

Years later after attending a radio contest, Mary was kidnapped and saved by Captain Marvel, who later learned thanks to two half of a broken locket they possesed, that they were indeed brother and sister.

Mary then learned that, just like Billy, she could summon divine powers by pronouncing the magical word Shazam. which would turn her into Mary Marvel, a superheroine with abilities bestowed by Selena, Hippolyta, Ariadne, Zephyrus, Aurora and Minerva.

Since she needs to speak a magical word to get her superpowers, Mary Batson was often kidnapped bound and gagged to prevent her from stopping bad guys.

Times in Distress

 * Crisis on Infinite Earths #10