Tyrannosaurus Rex and the swift-running bird dinosaur Lightning have never ventured beyond the forest due to childhood trauma. In order to find the lost young dragon, Daodao, they muster the courage to leave their home and embark on an adventurous journey. Along the way, they encounter various dangers and receive much help. Ultimately, they defeat the tyrannosaurus, rescue Daodao, and open their hearts to embrace the new world outside.