Steve Backshall and Michaela Strachan dive into the Ice Age like never before, as they witness the rise of mega-beasts such as the woolly mammoth and sabre-toothed cat. Using virtual production, these titans of the Ice Age are brought back to life. We reveal what made these mighty creatures so perfectly adapted to face the savage environmental extremes — and what led to their extinction. Deep within the Arctic Circle, Michaela is in freezing Svalbard solving the puzzle of why the Ice Age started in the first place. Meanwhile, Steve is in the UK discovering which Ice Age mega-beasts used the UK as their stomping ground. Joined by Prof Danielle Schreve, Steve is introduced to the bones of a mammoth, arctic foxes and even a massive Ice Age hyena. But Danielle has an even bigger discovery, and only now is she prepared to let the cameras in! She and her team uncovered the remains of almost a dozen Ice Age creatures all found in the same small cave near Plymouth.

It was during the Ice Age that humanity as we know it was forged. Two rival species competed until only one was left standing. Steve Backshall and Michaela Strachan travel the world to discover how Neanderthals and Homo sapiens survived at a time of brutal environmental change and uncover why we, Homo sapiens, survived while the Neanderthals were wiped off the face of the Earth. Steve heads to southern Germany, which is a hotbed of early human discoveries. In the freezing temperatures of the snow-lined valleys, Steve throws himself into Ice Age life, exploring how early humans evaded the mighty Ice Age predators such as the supersized cave bears and giant hyenas that stalked the freezing wastelands. In a battle against the elements and predators, Steve discovers how Neanderthals made fire in a surprisingly sophisticated way and crafted tools so sharp you could shave with them! Meanwhile, Michaela gets to grips with the differences between Neanderthals and Homo sapiens.

In the epic conclusion to the Ice Age story, we discover how the Great Thaw brought the end of the Ice Age and changed the world as we know it. Steve Backshall and Michaela Strachan go in search of a long-lost land that once connected the UK to mainland Europe before the Ice Age ended. Steve dives beneath the waves hunting for signs that the sea floor was once land and the thriving heart of Europe. Back on dry land, Michaela is on a hunt to find out more about this ancient land and wants to know how it flooded. She discovers that, less than 10,000 years ago, there was a natural disaster of epic proportions that helped form the North Sea and cut the UK off from Europe permanently. But this disaster may have been the catalyst for humans to develop further. Steve explores how early humans quickly adapted to their newly flooded world by developing watercraft unlike any we see on the rivers today.