The movie starts with the narrator introducing that the movie is about dinosaurs. They start 65 mya, in the Late Cretaceous. The narrator explains that a massive comet will arrive to mark the end of dinosaurs. Then we arrive 150 mya, in the Late Jurassic. We go in the ocean. An Ophthalmosaurus is shown escaping from a Liopleurodon. Then, finally we go to the Early Cretaceous, approximately 80 mya. They show an Argentinosaurus nest with hatchlings venturing out. One of the hatchlings, whom the narrator dubs "Strong One" is said that if he survives, he will grow to be one of the largest creatures ever. Then a Buitreraptor arrives and steals an egg, which he runs off with to feast on elsewhere. Then we go back to our time to watch Rodolfo Coria's discovery of Argentinosaurus. The narrator explains that Coria owns his own museum. He arrives at a digging site with his daughters, where he and his team work on digging out an enormous backbone, which a very old scientist declares larger than any other bone he had seen. They figure out that the huge bone belonged to a huge sauropod. They called it Argentinosaurus, meaning "Argentinian Lizard". Then they show the discovery of a huge theropod. Rodolfo emerges from his car and takes a picture of a dinosaur footprint. Rodolfo explains that they found more giant bones first thought to belong to another sauropod, but they were later found out to belong to a new theropod dinosaur they named Giganotosaurus, meaning "Giant Southern Lizard". Then they show a female Giganotosaurus protecting its nest from a Buitreraptor. The narrator says that this parental care was only familiar to theropods. The female manages to drive the threat away, but only one hatchling Giganotosaurus hatches. The narrator dubs the hatchling "Long Tooth". Then we see Rodolfo Coria in his museum with one of his daughters to show her casts of Argentinosaurus and Giganotosaurus skeletons. Then we see Strong One as a juvenile. He eats from the tops of the trees now. Meanwhile, Long Tooth hasn't had much of a growth spurt. She is hunting insects. She even eats some vegetation at this age, but as she develops into an adult, plants will be wiped out from the menu. She is shown hunting a dragonfly. But she fails and gives up. Then a Buitreraptor appears to devour the insect. He is victorious, but Long Tooth gets jealous and drives the Buitreraptor off a cliff. The narrator explains that even though Buitreraptor had feathers and resembled a bird, it couldn't fly. Then we come back to our time to see Rodolfo Coria answer a question: Did Giganotosaurus hunt in packs? Rodulfo's answer is simply, correct. The narrator tells the viewer that they figured out this with evidence from a very similar dinosaur not far from the digging site of Giganotosaurus that was found with at least seven of them called Mapusaurus. Then we go back to 80 million B.C. to se Long Tooth as a full-grown Giganotosaurus. She now lives in a pack and is stalking the Argentinosaurus herd. The victim chosen is Strong One and he gets a little wounded, but Strong One stands back and stops the Giganotosaurus pack from hunting. Long Tooth gets killed in the process and is eaten by the rest of her pack. They then move up to Late Cretaceous, in North America where they talk about Quetzalcoatlus and the end of the dinosaurs and the asteroid and shows a part of the asteroid crash and kills a Tyrannosaurus rex.

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