Who are we? Why are we here? Where do we come from? These are among the most enduring and profound questions we can ask, and it is an essential part of human nature to want to find the answers. We can trace our ancestry back hundreds of thousands of years to the dawn of humankind, but in reality our story extends much further back: it starts with the beginning of the universe. Professor Brian Cox tells the epic story of the universe and shows how its story is also our story.