Doraemon Movie 21: Nobita no Taiyou Ou Densetsu
English title: Doraemon the Movie: Nobita's the Legend of the Sun King
Japanese title: 映画 ドラえもん のび太の太陽王伝説
Alternative titles: Doraemon: Nobita and the Legend of the Sun King
Type: Movie
Source: Unknown
Episodes: 1
Status: Finished Airing
Aired: Mar 11, 2000
Duration: 1 hr 31 min
Rating: PG - Children
Studios: Shin-Ei Animation
Genres: Adventure, Comedy, Fantasy
Themes: Historical
Demographics: Kids, Shounen

Doraemon and its friends open a hole in the time and they're travel to the Country of Mayana, a lost Mayan civilization in the jungle. There, Nobita will know its perfect double, prince Thio, heir to the throne. Both will decide to interchange papers to try to save to the Country of Mayana of the claws of the infernal Ledina witch and her evil forces.

(Source: ANN)