Doraemon: Nobita and the Legend of the Sun King
2021
, also known as Doraemon and the Empire of the Sun, is a 2000 Japanese animated science fantasy adventure film, which premiered on March 7, 2000, in Japan, based on the 20th volume of the same name of the Doraemon Long Stories series. It's story is an alteration of the 1881 novel The Prince and the Pauper by Mark Twain as the two main characters switch places. imdb.com