2439 was a year in the 25th century.
- Wednesday, September 21: In an effort to free his family from Nazi spies at the New York World's Fair in 1939, Emmett Brown attempted to use the fact that Jules and Verne thought the spies were from the future to his advantage. He said that they were time travelers from the 25th century who went back in time to rebuild the 20th century into an image of the future. One of the spies, Fritz, thought that they should be speaking German as if they were from 500 years in the future, it would have only been halfway through the thousand-year Reich.
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