After stumbling upon a fossilized dinosaur egg, Nobita and Doraemon use futuristic gadgets to hatch and care for the dinosaur. Realizing they can't keep it, Nobita reluctantly sends the dinosaur back to its prehistoric era. However, when future hunters pose a threat to the ancient creatures, Nobita and friends embark on a daring journey to rescue the dinosaurs, venturing into a thrilling prehistoric escapade.