From the makers of Walking With Dinosaurs and Walking With Beasts this is an epic and entertaining new exploration of life before dinosaurs, when a succession of fantastical animals and plants ruled the planet. With the aid of scientific and computer technology a time is recreated when a two-tonne predatory fish came on land to hunt, and four-metre sea scorpions sliced sushi in the shallows, and when just one species of lumbering reptile represented eighty per cent of all life.