Doraemon: Nobita and the Legend of the Sun King[2] (ドラえもん のび太の太陽王伝説, Doraemon Nobita no Taiyōō Densetsu), also known as Doraemon and the Empire of the Sun,[3] is a feature-length Doraemon film which premiered on March 4, 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 story The Prince and the Pauper by Mark Twain and Snow White by the Brothers Grimm as the two main characters switch places. It was premiered together with the Doraemon short film Doki Doki Wildcat Engine (ドラえもんズ ドキドキ機関車大爆走!) and Doraemon: A Grandmother's Recollections. It was a successful film at the box office, grossing around ¥3.42 billion ($32 million), becoming the highest grossing Doraemon film of the original series. It's the 21st Doraemon film. The film celebrates 30 years of the Doraemon franchise. This is the last old millennium and old century era Doraemon movie, released ten months before the early new millennium, new century, and new year era begins.