The Good Dinosaur is a 2015 animated film produced by Pixar Animation Studios and distributed by Walt Disney Pictures.
65 million years ago, during the tertiary era, an asteroid entered a collision course with Earth but, thanks to Jupiter's gravity, it is diverted, avoiding the extinction of all dinosaurs.
Meanwhile, on our planet, two Apatosaurus farmers called Henry and Ida have three children: Libby, Buck and the smallest, Arlo. While Libby and Buck can easily adapt to life on Earth and assume their responsibilities at the farm, Arlo's timid nature makes his tasks very difficult.
In order to spur Arlo to become more enterprising, Henry entrusts him with the task of guarding the silos and helping him configure the traps. One day, a caveboy ends up in a trap, but Arlo can not kill him and so leaves him free. Henry, strongly disappointed by his son, decides to accompany Arlo to the baby. Father and son must pass by a ravine, but it begins to rain and Arlo slips and hurt; the father decided to go back, but a landslide surprised them. Henry manages to save Arlo before being overwhelmed and killed.
With the death of his father, Arlo must help the mother with the crop before the first snow comes. One day, however, he discovers in a silos the little caveboy and chases him until both fall into a river. He hits his head on a rock and is knocked unconscious. At his awakening, the little dinosaur realizes he is away from home and must rely on his own strength to survive.
Life in the prehistoric world is, however, very difficult and Arlo is terrified. When everything seems to be lost, Arlo meets the small man of the caves that helps him, giving him berries to eat and defeating a snake who wanted to devour them.
Arlo and Spot (as the dinosaur called the caveboy) become friends and begin to live together a fantastic adventure full of dangers. They become friends of a T-Rex group, struggling and winning against the velociraptor, facing the pterodactyls and succeeding in having the best against the perfidious Thunderclap.
History, however, wants that dinosaurs and humans can not live together, and Spot, during the trip, meets a group of men. Arlo, with great sadness, allows him to reunite with his species and after a long hug the two separated.
At the end of the trip, Arlo became a brave dinosaur and managed to return to his family.