When the Batson twins were babies, they were nursed by a woman named Sarah Primm. However, after their parents died, Mrs. Primm secretly gave Mary to the wealthy Ms. Bromfield, while Billy was sent to an orphanage.

Years later, Billy received an urgent letter from a dying Sarah Primm, revealing the truth and giving him a half a locket, which his sister possessed the other half. Billy told his friend, Freddy Freeman, and, as Captain Marvel and Captain Marvel Jr., the two heroes began looking for a contestant on Billy's radio quiz show that had a broken locket. Finding the girl as she is being kidnapped, they save her and inform her she is really Mary Batson, Billy's sister.

When the kidnappers awaken and gag both of the boys, Mary accidentally says "Shazam!" and transforms, defeating the crooks and saving the boys, being christened "Mary Marvel."

*Mary Marvel gets her powers from:
**Selena (grace)
**Hippolyta (strength)
**Ariadne (skill)
**Zephyrus (speed)
**Aurora (beauty)
**Minerva (wisdom)

* Captain Marvel Adventures #18-19, 37, 43
* The Marvel Family #4, 69, 84
* Whiz Comics #47-48
* Wow Comics #9-35
* Xmas Comics #5

*Marvel Comics owns the trademark for the name "Captain Marvel," with DC Comics owning trademarks for the names "Shazam!" and "Mary Marvel." In order to use Mary Marvel's name, it can only appear in the interior of the story.
*A girl resembling Mary Marvel appears in a puzzle page from Charlton Comics' Mysteries of Unexplored Worlds #1; the author is unknown.

*[http://en.wikipedia.org/wiki/Mary_Marvel Wikipedia]
*[http://www.herogoggles.com/fawcett_heroes.html Hero Goggles]
*[http://www.internationalhero.co.uk/m/marymarv.htm International Hero]
*[http://www.dpccomics.pwp.blueyonder.co.uk/theamericancomicshop/goldenagedatabase/index.php?search=Mary+Marvel&searchnames=on Golden Age Hero Directory]
*[http://www.toonopedia.com/marymarv.htm Toonopedia]
*[https://superheroes.fandom.com/wiki/Mary_Marvel Superheroes Wikia]
*[https://comicvine.gamespot.com/mary-marvel/4005-2356/ Comicvine]
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