Plus Ultra is a fictional secret society featured in the 2015 Disney film, Tomorrowland
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Gustave Eiffel met Jules Verne along with Nikola Tesla and Thomas Edison at his Tower apartment to start a secret society of optimists. Plus Ultra was founded at the 1889 World's Fair in Paris. The organization's purpose is to create, moderate and expand upon new scientific advancements for humanity. Key members of Plus Ultra included Ray Bradbury, Amelia Earhart, Mark Twain, Nikola Tesla, and other key scientific figures. Walt Disney was a member of Plus Ultra.
In the early 1900s, Nikola Tesla discovered an alternate dimension, an ideal place for Plus Ultra to establish a experimental community of tomorrow. Opening a way into this dimension would be a focus of experimentation afterwards, with the Tunguska Event of 1908, a powerful explosion in the Siberian woodlands of unknown origin, actually being caused by Plus Ultra experimenting with an atomic weapon to open a way into the dimension. When safer methods for entering were developed, they began work on the city. Testing specialized aircraft developed for entering the dimension resulted in the disappearance of Amelia Earhart, who became stranded in the dimension for a brief time and became a secret agent of Plus Ultra upon her return to Earth.
In 1939, Plus Ultra was gearing for a public reveal of their city at the 1939 New York World's Fair. However, a conflict with Nazi spies led by an ex-Plus Ultra scientist, Werner Rotwang, resulted in the city becoming heavily damaged. Between this and the looming threat of World War II, Plus Ultra cancelled their event.