In a world where dinosaurs never became extinct, Arlo is a timid and clumsy Apatosaurus struggling to find his way in a wild and imposing environment. Even though his family sees him as the weakest among his siblings, Arlo longs to prove his worth. The opportunity arises when his father needs help on the farm, and Arlo embarks on an adventure to capture a strange being that is eating their crops: a small human boy whom Arlo names Spot.
After a series of unfortunate events, a storm sweeps Arlo far from his home, and with his life turned upside down, he is forced to forge an alliance with Spot, who, despite being small and vulnerable, has an indomitable spirit. Together, they embark on a journey through breathtaking and dangerous landscapes, facing fierce dinosaurs and their own fears. As their friendship blossoms, Arlo begins to discover his inner courage and what it truly means to be a "good" in this world.
With a powerful message about family, self-worth, and the value of friendship, Arlo and Spot help each other in their quest for home and acceptance. This journey not only transforms them but also redefines what it means to be a true hero in a world that, despite being wild, is full of beauty.