In North America, a father Tyrannosaurus and his offspring swim across a perilous seaway to feed on a dead protostegid turtle. In North Africa, Tethydraco nestle their brood by the shores of the mainland, while baby Alcione take their first flight from a nearby island, encountering the predatory Barbaridactylus and Phosphatodraco in the process. Dozens of Tuarangisaurus travel to a bay in Zealandia to search for gastroliths, with some capitalizing on the situation as an opportunity to mate. A male Mosasaurus is cleaned by reef denizens and defends his territory from a younger, rival mosasaur. Bioluminescent scaphitid ammonites perform an elaborate mating display at night, fulfilling one of the last and most important events of their short lifespans. A pregnant Tuarangisaurus is targeted by a Kaikaifilu and protected by her pod, after which she gives birth to a healthy, baby plesiosaur.

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Several male Dreadnoughtus clash for the right to mate, with an old male dying as his younger rival takes his place as the dominant contender. A pair of Velociraptor hunts for lizards among a group of sleeping Tarbosaurus surrounding a sauropod carcass. A Mononykus forages for termites in the desert, and, following a brief rainstorm, searches for prey within freshly-grown vegetation. Several animals (Barsboldia, Mononykus, Nemegtosaurus, Mongolian azhdarchids, Tarchia, Therizinosaurus, "Mongolian Titans", and Tarbosaurus) congregate around a temporary watering hole. Male Barbaridactylus compete for females atop a remote mesa, with some dominating through violent means, while others pretend to be females. In the desolate gypsum dunes of South America, a herd of Secernosaurus brave the elements and rely on their senses to reach their destination, plants growing by the seaside.

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In Asia, a trio of Velociraptor hunt juvenile pterosaurs near a waterfall. In North America, an old, battle-scarred male Tyrannosaurus feeds on a Triceratops, nurses his wounds, and encounters a three-year younger female, which he attracts and mates. A Deinocheirus feeds on river plants, and scratches himself against a dead tree to relieve himself of blood-sucking flies. In southern Africa, a female Quetzalcoatlus builds and guards her nest, eventually coming to blows with an older Quetzalcoatlus that destroys some of her eggs. In Madagascar, a mother Masiakasaurus and her family hunt crabs, but one of her hatchlings is ambushed by a Beelzebufo. Somewhere in South America,^[20] some elasmosaurs enter an estuary in search of fish.

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As winter ends in Alaska, three Dromaeosaurus get a herd of Edmontosaurus to panic and stampede across a freezing river, causing one juvenile hadrosaur to drown, allowing the theropods to eat. Male Ornithomimus set up nests by a river for females, though one raids his neighbor's hard work to bolster his own. In an east Russian volcanic region,^[21] a herd of Olorotitan raise their offspring on fertile volcanic fields but contend with biting mosquitoes. In the Arctic Circle, a troodontid flushes out Cimolodon^[22][23] by spreading a forest fire. Turned away by his two siblings, a juvenile Antarctopelta scours the forest for a new winter den, briefly crossing paths with a herd of Antarctic hadrosaurids before settling within a massive cavern with glowing fungus gnats. A Pachyrhinosaurus herd stands off against a trio of Nanuqsaurus during a blizzard, with the herd eventually panicking, giving the tyrannosaurs an opportunity to bring down one of them.

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Austroposeidon herds level several trees in search of fresh foliage, with the forest's plants closing the hole in the canopy almost immediately. A herd of Triceratops journey through a cave to find an underground clay lick. A male Carnotaurus sets the stage for an elaborate display, only to be rejected by a female. In Asia, a female Qianzhousaurus takes advantage of the autumn winds to ambush a flock of Corythoraptors. A family of Edmontosaurus evade a forest fire, while an Atrociraptor and an ankylosaur take advantage of the situation to feed on beetles, smoke out parasites, and feed on charcoal. At night, three juvenile Therizinosaurus attempt to climb up a tree to reach a beehive, eventually getting to feed on it after a passing adult Therizinosaurus knocks the beehive down. In the forests of Hațeg Island, Telmatosaurus takes cover, while Hatzegopteryx preys on juvenile Zalmoxes and patrols the dense undergrowth, before flying past the seaspray-battered coastline.

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After a tropical storm, a Zalmoxes on a raft escapes a mosasaur and finds a female Zalmoxes on a larger raft. Several Hatzegopteryx ambush a herd of Tethyshadros. In Madagascar, a female Majungasaurus hunts Simosuchuses. Nearby, a mother Adalatherium raises her offspring in a burrow, eventually moving her family out due to the presence of a Madtsoia, which preys on a Masiakasaurus, another potential threat to her offspring. For their family of five, three Imperobator pursue a Morrosaurus across a frozen lake, though their prey successfully escapes. A male Hatzegopteryx attracts a mate on a small island, proving his worth with a dead juvenile Tethyshadros he brought, a ceremonial nest, a synchronized dance, and by aggressively driving away a younger male.

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In India, dozens of female Isisaurus traverse the Deccan Traps to reach their nesting site. In Mongolia, a herd of Nemegtosaurus, "Mongolian Titans", and Prenocephale navigate a maze of canyons to reach a source of water, but are ambushed by a trio of Tarbosaurus, an event that a pair of Velociraptors capitalize on in order to hunt a Prenocephale for their family. A colony of male Corythoraptors protect their eggs from the scorching sun, though a female Kuru kulla stealthily eats some of the eggs at night, before running off with one egg to feed her own pair of young. A pair of juvenile Tarchia travel through the desert in search of sustenance, fighting seven Prenocephale and an adult Tarchia to lay claim to a hidden oasis. Several Isisaurus hatchlings traverse the Deccan Traps to reach their mothers' ancestral forest home, with some falling to mudpots and a pair of Rajasaurus in the process.

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Pterosaur hatchlings take flight to leave their island sanctuary, with many being caught by Shamosuchuses. Several Austroraptors hunt garfish and contend with the best fishing spots. A Beelzebufo tries to attract a mate while a herd of Rapetosaurus take a mudbath in its pond. A herd of ten Pachycephalosaurus look for water in a drought-stricken field in North America, with the dominant male fighting and expelling a young male for his aggression. In Hell Creek of North America, two subadult Tyrannosaurus brothers^[28] ambush a herd of Edmontosaurus annectens in a forest, taking advantage of their superior senses under the cover of darkness.

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A female Phosphorosaurus hides during the day from larger mosasaurs, and emerges by moonrise to hunt lanternfish. In North America, the food chain is shown, with a group of Hesperornis and several Xiphactinus feasting on numerous small fish, the Hesperornis getting hunted by Xiphactinus, and the larger Xiphactinus cannibalizing the smaller ones. Nostoceras hatchlings are at the mercy of tides, with some escaping while the others are left stranded and eaten by juvenile Pyroraptors. In the Pacific Ocean, a pod of Tuarangisaurus leave their atoll sanctuaries to feed, exposing themselves to a Mosasaurus ambush. The young Nostoceras that survived find themselves among Baculites and Diplomoceras in their new seagrass meadow home. A pod of Morturneria dive below the ice sheets of Africa to sift the muddy seabed in search of food.

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A Tyrannosaurus rex and two Quetzalcoatlus fight over an Alamosaurus carcass. A shoal of Sphenodiscus are ambushed by a Globidens, relentlessly killing and eating several of them while the survivors make it to shallow water, where they can lay their eggs. At an evaporating soda lake, juvenile Pectinodons hunt flies while their father hunts "Styginetta". Male Triceratops compete with each other for the right to mate, with a young male losing his left horn after battling a 30 year-old veteran. A female Nanuqsaurus hunts an Ornithomimus to feed herself and her seven hatchlings.

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