65 million years ago, after the extinction of the dinosaurs, a new generation of beasts emerged: the first giant mammals. From four-ton ground sloths and woolly mammoths to fierce sabre-toothed tigers, this was the ‘Age of Megafauna’.

But how did these massive creatures live alongside humans? And why did they eventually become extinct? World-leading palaeontologist Gerry De Iuliis sets off on an international expedition to unravel one of the greatest mysteries in the history of life on Earth.

He travels across the Americas uncovering fossils, footprints and caves and meeting other experts who can help reconstruct this vanished world. And he finds extraordinary new evidence which completely re-shapes our understanding of the rise and fall of megafauna.

Groundbreaking new research and stunning CGI recreations bring these lost Ice Age giants to life like never before.