Luckily for young Arlo, his parents (Jeffrey Wright, Frances McDormand) and his two siblings, the mighty dinosaurs were not wiped out 65 million years ago. When a rainstorm washes poor Arlo (Raymond Ochoa) downriver, he ends up bruised, battered and miles away from home. Good fortune shines on the frightened dino when he meets Spot (Jack Bright), a Neanderthal boy who offers his help and friendship. Together, the unlikely duo embark on an epic adventure to reunite Arlo with his beloved family.