Doraemon: Nobita to Midori no Kyojin Den

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.

Nobita had to find a topic for his summer break research homework. As he was blaming everything to Adam and Eve for sinning and causing their descendants to suffer (from homework), Doraemon decided to provide him with a gadget to observe the creation of the world so that he may write it in a diary-like report. Suneo, Giant and Shizuka eventually joined them and together they watch over the birth of tribes and civilizations. Meanwhile, the time patrol is looking for an illegal time machine whose controllers accidentally heard Giant speaking of the genesis diary project. They captured Giant and Suneo; leaving Nobita, Shizuka and Doraemon to watch over the genesis set and to rescue them.

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Nobita finds a fossilized dinosaur egg by accident, and with the help of Doraemon's tools, they hatched the egg and began raising the dinosaur. Knowing that they can't keep the dinosaur forever, Nobita was forced to send it back to prehistoric times where a group of hunters from the future threatens to endanger the dinosaurs. Determined to save the dinosaurs from the claws of the hunters, Doraemon and the gang returns to the past and sets out in a prehistoric adventure.