Running Away to the Cretaceous Period

Inspired by a television drama, Suneo decides to run away from home and to the Cretaceous period, leading Doraemon and the rest to go there and try to convince him to return home. But when Suneo is taken away by a Tyrannosaurus, the gang must rescue him from its wrath. Meanwhile, Gian brings with him an egg which hatches into a baby Tyrannosaurus, so they try to return it to its parent, who is risking its life to protect Suneo.