Mary Marvel is a fictional character and superheroine 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. The character is a member of the Marvel / Shazam Family of heroes associated with the superhero Shazam / Captain Marvel and is one of the first female spin-offs of a major male superhero, and predates the introduction of Supergirl by more than a decade.