Montana, USA- 65,5 million years B.C. In the last days of the dinosaurs' hegemony over the world, a female Tyrannosaurus struggles to reproduce in a world poisoned by volcanic gases, which has resulted in dwindling prey numbers.
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Featured creatures: Tyrannosaurus, Anatotitan, Torosaurus, Triceratops (the creature killed by the male Tyrannosaurus), Quetzalcoatlus, Dromaeosaurus, Ankylosaurus, Didelphodon, Dinilysia (the snake), Deinosuchus (the crocodile). The small bipeds attacked by the Dromaeosaurus are either Orodromeus, Parksosaurus or Thescelosaurus. The carcasses of a Tyrannosaur (possibly a juvenile specimen or a smaller species) and a prehistoric mammal can also be seen. This is the largest cast of the series. See more
The snake encountered by the young Tyrannosaurs is obviously a modern day python. Cretaceous snakes were primitive and looked different from modern ones, for instance their head looked more like that of a monitor lizard. See more
There are still islands of greenery between the barren lava flows. In the warm moist climate of the late Cretaceous period, the vegetation has transformed.