The actor and writer is magically transported back in time to chart the 180-million-year story of the prehistoric creatures, beginning by going back 155 million years to the Jurassic period. He explores the conifer forests and fern prairies that were their home, encountering a monstrous plant-eating diplodocus and deadly predator the allosaurus. Expert Susie Maidment arrives to decode these dinosaurs' remarkable behaviour, including the diplodocus