Walking with Cavemen - "The Survivors"

The fourth episode first shows Homo heidelbergensis in Britain. H. heidelbergensis is depicted as intelligent and sensitive but lacking in the ability to comprehend an afterlife, or anything that isn't in the "here and now". Next, the episode shows a clan of Homo neanderthalensis, how they lived and hunted, including the mighty mammoth during the last ice age. Finally in Africa then we see Homo sapiens idaltu which are not getting along in Africa's drought unlike the Neanderthals, along with them we see modern Homo sapiens (represented by bushmen), who had to become imaginative and inventive to survive the long drought unlike their subspecies idaltu, and finally glimpse the cave painters of Europe, who had "evolved" the idea of the afterlife and the supernatural, and now ready to start the human history as it is now known (and drive the Neanderthals to extinction).

Location: Europe, Africa
Time: 400,000 ya–30,000 ya  
Animals: Megaloceros · Mountain hare · Woolly Mammoth · Beetle · Snake

Walking with Dinosaurs - "New Blood"

A female Coelophysis is shown stalking a herd of dicynodonts called Placerias (a giant synapsid or mammal-like reptile), looking for weak members to prey upon. A male Thrinaxodon is shown downstream, returning to his burrow from the river. The last focus of the episode is a female rauisuchian Postosuchus (one of the largest carnivores alive in the Triassic) who is first shown attacking a Placerias herd and bites one of the members, driving the rest of the herd to retreat and leave the wounded and weakened member of the group to the carnivore.
Early pterosaurs called Peteinosaurus are depicted feeding on dragonflies and cooling themselves in what little water is present during the drought. Still searching for food, the Coelophysis are shown discovering the Thrinaxodon burrow (and are initially frightened away by the male when it emerges).

Eventually, an inquisitive Thrinaxodon pup follows the father to the entrance and is eaten by the female Ceolophysis before he can drive the predators away. At night, the pair of Thrinaxodon are shown eating their remaining young, then moving away, while during the day, the Coelophysis work to expose the nest. The female Postosuchus is later shown to have been wounded by the Placerias in a previous attack (which left her with a tusk wound on her thigh), and after being unable to successfully hunt another member of the Placerias herd she is beaten out of her territory by a rival male Postosuchus. Wounded, sick and without a territory, the female dies and is eaten by a pack of Coelophysis. As the dry season continues however, food becomes scarce and extreme measures are taken by all animals. The Placerias herd embarks on a trek through parched wasteland in search of water, while the Coelophysis start killing and cannibalising their young. The male Thrinaxodon also resorts to hunting baby Coelophysis during the night. Finally, the wet season comes, and the majority of the Coelophysis have survived (including the female), along with the Thrinaxodon pair, who have a new clutch of eggs. The episode ends with the arrival of a migrating herd of the prosauropod Plateosaurus, foreshadowing the future dominance of the giant sauropods after the Triassic-Jurassic extinction event.

Location: Arizona
Time: 220 mya (Late Triassic)
Animals: Coelophysis · Thrinaxodon (identified as cynodont) · Placerias · Postosuchus · Peteinosaurus · Plateosaurus · Lungfish
Filming location: New Caledonia

Walking with Cavemen - "Blood Brothers"

The second episode leaps forward to a time when Paranthropus boisei, Homo habilis and Homo rudolfensis co-exist. H. habilis is depicted as an intelligent omnivore that is more adaptable than the herbivorous P. boisei. The two species are contrasted, with H. habilis being "a jack of all trades", while P. boisei are "a master of one" - i.e. they are specialized herbivores while H. habilis are generalized omnivores. Consequently, though P. boisei are able to eat termites, tall grasses and hard acacia pods in difficult times, they will not be able to survive in the future, when at the beginning of the next Ice Age the climate will change, and these plants will be gone for good. H. habilis, on the contrary, have become smart by eating fresh carrion and bone marrow among other things, and evolving a basic social behavior, which is more firm than that of P. boisei, will continue to survive, until it evolves into Homo ergaster, seen in the next episode, who has developed these traits to a greater extent. The episode also briefly shows the H. rudolfensis, remarking that although they are taller, they are very similar to the H. habilis.

Location: East Africa
Time: 2mya
Animals: Dinofelis · Deinotherium · Ancylotherium · Lion · Eland · Impala · Bees · Vultures

Walking with Cavemen - "Savage Family"

In the third episode, Homo ergaster is depicted as the first creature to master the art of tracking. This was made possible because their diet has grown increasingly more carnivorous, and the nutrients in meat made them even smarter than H. habilis of the previous episode. They also begin to form into tribal societies, with genuine bonds between their men and women, though violence is still occurring. The episode later shows H. ergaster spreading into Asia, becoming Homo erectus and encountering the enormous herbivorous ape Gigantopithecus, "the original King Kong". However, for the next million years, H. ergaster is still very much an animal, following its instinct, but then, they are shown harnessing fire and beginning to break-away from their direct dependence on their environment.

Location: Kenya, China
Time: 1.5 mya–500,000 ya
Animals: Wildebeest · Swallow ((Elephant)) · Tarantula · Ants · Giraffe · Baboon · Gigantopithecus

Walking with Cavemen - "First Ancestors"

In the first episode, we see Australopithecus afarensis, and focus on their evolved bipedality. The story follows the famous Lucy and her relatives, as they first develop a leadership conflict following the death of the alpha male due to a crocodile attack, and then are attacked by a rival troop. The attack ends with the death of Lucy herself, and her eldest daughter caring for Lucy's now-orphaned baby sibling, as a sign of the developing humanity in these "apemen".

Location: Ethiopia
Time: 3.2 mya
Animas: Ancylotherium · Deinotherium · Verreaux's Eagle · Crocodylus thorbjarnarsoni · Zebra finch