2112: The Birth of Doraemon
Encyclopedia
is a movie about the life of Doraemon
Doraemon
is a Japanese manga series created by Fujiko F. Fujio which later became an anime series and an Asian franchise...

 from birth, before coming to Nobita.
The movie is sort of a prequel to the entire series, it showed the life of Doraemon before traveling to the 20th century: How he was made, how he was partially broken, how he lost his ears, how he met the Nobi family and decides to return to the past to help Nobita.
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