Prehistoric beasts thrive including a family of Apatosaurus comprising patriarch Henry, his wife Ida and three children Buck, Libby and Arlo. A tragic accident robs the siblings of their father and soon after, Arlo falls into a river and is swept far away from his loved ones. Lost in the wilderness, Arlo meets a feral cave boy called Spot, who becomes the dinosaur's protector. Beast and human child embark on a magical adventure to return Arlo to his home in the shadow of the Clawed-Tooth Mountains.
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