Doraemon Movie 21: Nobita no Taiyou Ou Densetsu

(Esta sinopse está em inglês. Ajude a comunidade traduzindo!)

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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)