Mary Oceaneer was first introduced as part of the Society of Explorers and Adventurers through a portrait in the queue of Mystic Manor.
She was further developed for the Disney Cruise Line's Oceaneer Lab with a series of portraits establishing her as a treasure hunter and diver accompanied by her pet parrot Salty. The maiden voyage of her Oceaneer Lab ship took place on July 30, 1898 (a reference to the Disney Magic's maiden voyage) and uncovered buried treasure on Castaway Cay. Treasures from the Castaway Cay expedition and other excursions are on display throughout the Oceaneer Lab's central areas. With treasure hunting being her main occupation, she had a fondness for pirate lore and would establish special "Pirate Nights" aboard her vessel.
The Typhoon Lagoon attraction Miss Adventure Falls is set in the aftermath of one of her adventures aboard the M.S. Salty IV ship. On her way to port, she and her second parrot Duncan were caught in a storm and ended up stranded at Typhoon Lagoon. Recent acquisitions were scattered around the shipwreck site and judging from beach chairs set-up on the site, she was prepared for an extended stay. She can be heard providing the safety spiel for the attraction. Meanwhile, Duncan has chosen to roost in the exposed cabin of the ship, looking for treasure by spyglass.
Items from Mary can be found in the Skipper Canteen including a map charting legendary beasts of the Mediterranean Sea created by her, a library book titled "Parrots as Pets", her Club fez, and assorted certificate awards for Albert Falls featuring her signature. Mary Oceaneer is also one of the members of S.E.A. that left an expedition paddle at The Tropical Hideaway, with her paddle coming from an 1899 expedition on the Orinoco River in South America.
- Mary's name is possibly derived from Disney Legend Mary Blair. Some of Blair's artwork produced for Peter Pan is utilized in murals found in one of the Oceaneer Lab's activity rooms.