Cast & Crew
Paula S Apsell
According to evolutionary theory, all four-limbed creatures -- from dinosaurs to humans -- are descended from one single creature, the first animal to crawl from water onto land. This vital bridge between fish and land-animal has long been a mystery to scientists. The program follows a group of paleontologists on a trail from Pennsylvania to Greenland. Along the way, they discover some clues, including a tiny fossil jaw that lay unnoticed in a dusty museum drawer for decades.