You Are Umasou
The story sets in the Late Cretaceous Period, when dinosaurs continued to rule the earth. A female Maiasaura finds an egg and decides that the baby in the egg needs to be taken care of, so she adopts it as her own. She takes it to her nest in Egg Mountain, a volcano with a giant egg shaped rock. One fateful day, a marauding pack of Troodon attacks the nesting grounds, snatching and eating the Maiasaura eggs. The outcome of the attack resulted in the mother losing all but two of her eggs (one of which is the egg she saved). As the eggs hatched, one was born a male Maiasaura naming him Light, and from the egg she found, the baby is revealed to be a Tyrannosaurus, naming him Heart. The herd leader was about to kill Heart in order to prevent him from eating anyone when he gets older, but the Maiasaura stops him, arguing that is new born and inoffensive. The leader then gave her the chance of leaving him in the wild where he belongs, and she was about to do so. However, she changes her mind out of guilt of abandoning Heart and leaving him alone, so she decides to move from the herd and raise her children by herself. Years later, Light and Heart now live in the forest with their mother, where they would be safe from predators and free from the herd. But Heart is oblivious of his carnivorous nature and can only eat berries. While they were playing, Heart and Light felt from a cliff and a swamp, there they meet a sloth mother singing a song about tyrannosaurs and describing their appearances. The sloth sees Heart and retreats in fear.
As Heart is unable of eating plants and can't sustain himself of berries, he travels outside the forest and into the plains to look for food; unfortunately he watches a Triceratops fighting a pack of Tyrannosaurus, one of which is impaled by one of its horns and killed. Suddenly from the mist enters Baku, a particularly large Tyrannosaurus with a scar over his right eye, who slams the Triceratops to the ground, killing it. After watching the pack eat the corpse, Heart tries to retreat quietly to avoid being eaten as well, not knowing he was one of them. However Baku notices him and ask him about his family. Heart fearfully answered that he had a brother and a mother, not telling that they are Maiasaura. then Baku explains the lifestyle of a predator, which make Heart to flee in panic, without noticing that Gonza, one of the Tyrannosaurus, was following him. After rejoining with Light, Heart tells in disdain his experience with the Tyrannosaurus, but Gonza arrives and threatens Light that he'll eat him. In panic Light yells to Heart to save himself, causing Gonza to wonder why a Maiasaura would take care of a Tyrannosaurus. Light explains that Heart is his brother, but then Gonza reveals Heart's real species, which Heart denies and attacks Gonza. He bites and rips off his tail, leaving Gonza to flee painfully, feeling betrayed. Unfortunately, Heart realizes that he was telling the truth, upon eating the tail, and he couldn't control his predatory instincts when he tackles Light, so he decides to run away to avoid killing and eating his family.
Years later, Heart is now a fully grown dinosaur with enhanced hunting and martial arts skills, such as beating a whole herd of Titanosaurus, and having a step forward from Gonza's pack. Meanwhile, Light is allowed to return the herd as Heart doesn't live with them anymore. One day Heart discovers an egg which houses an Ankylosaurus. When the baby hatches, Heart tells him that he is Umasou (the Japanese word for delicious), and he prepares to devour him when the baby jumps and cuddles Heart believing that Heart was his father and that Umasou was his name, much to Heart's surprise and confusion. He then decides to raise him (initially to wait until he fattens enough for him to eat). Umasou acted very loving toward Heart, but Heart remained emotionally distant to Umasou as he wanted to eat him later. Later Heart goes to hunt a Parasaurolophus, leaving Umasou waiting him in the grass. A nearby Chilantaisaurus notices him and was about to eat him, but Heart arrives and quickly sent it flying away with a kick. Umasou cheered for saving him, but Heart angrily tells him that the Chilantaisaurus could have eaten him and to stay alert for predators. The next day, Umasou wanted to gather berries to eat with his father, while Heart searched for Umasou in frantic. He gives up the search and loses hope, but then Umasou returns with the berries. Enraged, Heart yells at Umasou to go away, which makes Umasou cry and tells why he left. Heart notices the berries and apologizes for yelling at him. Umasou mentions that he got the berries from Bekon, an elderly Tyrannosaurus who has grown too old to eat solid food and eats the berries. The two go to meet him and he explains Baku's story. A massive pack of Giganotosaurus arrived from the south and went on a rampage, killing everything in their path, forcing Baku fight them by himself. The battle resulted in him losing an eye and receiving the scar, but he succeeds in defeating the Giganotosaurus and now is the king of the plains. After what happened that day, Heart decides to train Umasou to protect him from predators, and during the training, he started to like Umasou to the point to quit his initial plan of eating him. Even all the time he spent with Umasou, Heart still didn't accepted him as his son and was worried he might find out the truth, so he tricks him to make a race and if Umasou wins, Heart would stay with him forever, and lets him run away from Heart. But Umasou enters the outlands where encounters Gonza's pack, who nearly kills him. Realizing Umasou was in danger, Heart went to the rescue and saw Gonza about to eat Umasou. Driven to a rage, Heart attacks Gonza and kept Umasou safe in his mouth, before defeating the gang with his bare martial arts skills. Then Baku appears when he witnessed what Heart did, and decides to banish Heart as a punishment for beating others of his kind. Once Heart got away from the plains, he was relieved and glad to see that Umasou was still alive and safe. He finally accepts him as his son and promises to live together, and they leave the plains to find their new home.
Some months later, Heart and Umasou (who had grown slightly bigger) have moved to the beach. But Heart fell from a cliff and into the ocean, and he was saved by a female Elasmosaurus called Pero Pero. Pero Pero didn't known at first that Heart was a carnivore, until the two got attacked by a Mosasaur, which Heart kills by ripping off one of its flippers. Yet, Heart promised to never hurt Pero Pero, and she won't be afraid of him. After Heart realizes that Egg Mountain was having high volcanic activity, he and Umasou went to save their family. On his way, their first obstacle was Gonza, who wanted to get revenge for everything that Heart did to him, and he wouldn't let them pass until he's dead. The two have a short fight, in which Heart wins by ripping a chunk off of Gonza's neck. As he lays dying, Gonza learns Umasou is Heart's son and ridicules it, telling Umasou that Heart is not his father. Umasou knows, but still considers Heart as his dad, knowing that, Gonza apologizes (and maybe forgives Heart). When Heart reaches to Light's herd, his brother informs him that their mom doesn't live with the herd anymore and that she still is in their former home in the forest. He didn't looked for her because of his job in the herd as guardian. However, the herd is too afraid of the volcano to move. Out of his deception, Heart started to scare away all the Maiasaura to move for safety. After clearing the second obstacle, Heart rushed to encounter his mother, whom at last feels relieved and warm hearted of finding her lost son. Heart introduces Umasou, and meets his new siblings, a girl and two male twins. After the warm reunion, all the family, including Light, headed out of the mountain, which the eruption was strong enough to blast the egg rock from the volcano. Soon they almost escape from the eruption, but Baku appeared from the volcanic dust and threatens to kill Heart since he disobeyed his order of exile. In order to protect his family, Heart accepts a duel with Baku, in which one (Baku) does normal Tyrannosaur attacks and movements and the other (Heart) displaying quick martial arts kicks. In the midst of the battle, Heart bites Baku's neck, which was a great mistake when Baku grabs Heart, leaps, and smashes him with all his weight to crush him, almost killing him. Heart's mother pleads to spare him, revealing that she is his adoptive mother. This makes Baku wonder what would she do if Heart was starving for not eating meat, to which she responds that she would let him eat her, which Baku considers nonsense. He explains that a carnivore have to eat meat every day in order to survive. At the same time, he accepts that Heart wouldn't have survived without her help, so he agrees to spare Heart and the others. As Baku lies down to recover from his wounds from the battle, he tells Heart to be good (implying that Baku might be Heart's father).
In the aftermath, Heart's Mom asked him if he would live with them when they reached their new home, but he refuses, telling that it would be better for everyone to stay with their own species. She agrees guessing Heart would wanted that, but he also denies, saying that he enjoyed being her son. The family cuddles and wave goodbye for last time before Heart and Umasou go on their way again. During the end credits, the Maiasaura herd move on to a new home. Baku returns to the plains and Bekon welcomes him back. The movie ends with Heart and Umasou watching Egg Mountain fly away to outer space
Dinosaurs and other prehistoric reptiles featured
- Ankylosaurus (Umasou)
- Chilantaisaurus (the purple horned carnivore, species implied in the 2nd episode of the animated series)
- Elasmosaurus (Pero Pero)
- Giganotosaurus (seen only in Baku's backstory, referred to as "gluttonous long-necks from the south")
- Maiasaura (Light, Heart and Light's mother, among others)
- Ornithocheirus (seen in the beach scene, dropping a red berry)
- Parasaurolophus (background only, one is killed by Heart)
- Protoceratops (seen fleeing from Heart, one is killed and eaten)
- Pteranodon (background only)
- Titanosaurus (the sauropod herd Heart defeats)
- Triceratops (one battles Gonza's pack and is killed by Baku, others appear in the background)
- Troodon (the flock of maniraptorans that raid the Maiasaura nesting grounds)
- Tyrannosaurus (Heart, Baku, Gonza, Bekon, among others)
- unidentified neornithes
- a herd of titanosaurs, possibly Alamosaurus
- unidentified purple hadrosaurs, possibly Edmontosaurus, Kritosaurus, or Gryposaurus
- unidentified multicolored ornithomimids, possibly Ornithomimus, Gallimimus, or Struthiomimus
- 2 unidentified red dromaeosaurs, possibly Dromaeosaurus or Achillobator
- unidentified mosasaur, possibly Mosasaurus, Tylosaurus, or Hainosaurus
- corpse of a narrow-snouted theropod, probably a spinosaur
- burnt corpse of an unknown dromaeosaur
Freelance writer Brian Switek said that the film was one of the strangest and "most adorable" dinosaur films he has seen.
- "You are Umasou Picture Book Gets TV Anime in October." Anime News Network. August 13, 2010. Retrieved on December 18, 2011.
- Switek, Brian. "The Dinosaur Family Foodchain." Smithsonian. December 13, 2011. Retrieved on December 18, 2011.