Arlo (played by Raymond Ochoa) is a young member of the dinosaur Apatosaurus family. He has a father, Henry (played by Jeffrey White), and a mother, Ada (played by Frances Middot). ; McDormand) and two siblings, but it is the smallest among the children. It is full of unknowns and fears about the outside world. After an unexpected disaster, Arlo was separated from his family and wandered in the vast world. In desperation, a little human boy (played by Jack Bright) appeared and brought food to Arlo. However, this action gradually warmed Arlos heart. Later, he named the little boy Diandian and... From then on, they depended on each other for life. Under the guidance of Bucky the Tyrannosaurus Rex (Sam Elliott), the two friends embarked on a journey home across thousands of mountains and rivers.
