Brought together by a mysterious song, a grad student and an engineer lead the fight against an unimaginable force that may spell doom for the world.

A three-part British documentary film series about life in the Paleozoic, bringing to life extinct arthropods, fish, amphibians, synapsids, and reptiles. Narrated by Kenneth Branagh and using state-of-the-art visual effects, this prequel to Walking with Dinosaurs shows nearly 300 million years of Paleozoic history, from the Cambrian Period (530 million years ago) to the Early Triassic Period (248 million years ago).