Mary is a young girl rescued by Professor Yamatone and his companions after surviving a shipwreck triggered by one of Dr. Nazo's robots. Following her rescue, she integrates into the core group journeying with Professor Yamatone, his son Takeru, and the professor's assistant Dareo. This team accompanies the awakened Atlantean warrior Golden Bat, fighting against the world-conquering schemes of the evil Dr. Nazo and his forces.

In certain narrative versions, notably the 1966 live-action film, a character fulfilling a similar role named Emily possesses a distinctive bat-shaped pin. This pin functions as a summoning device to call upon Golden Bat when needed. While not explicitly named Mary in this film, the character embodies the archetype of a young girl integrated into the heroic team and linked to Golden Bat's appearances. An earlier comic adaptation also featured a comparable young girl character replacing Mary, though her specific name remains unrecorded in available sources.