Beginning in Ethiopia, Professor Brian Cox discovers how the universe played a key role in our ascent from apeman to spaceman by driving the expansion of our brains. But big brains alone did not get us to space. To reveal what did, Brian heads out of Africa to the ancient city of Petra in Jordan, where he unpicks the next part of our story - the birth of civilization - and then on to Kazakhstan, where he witnesses the return of astronauts from space and explains what took us from civilization to the stars.

Brian reveals how the wonderful complexity of nature and human life is simply the consequence of chance events constrained by the laws of physics that govern our universe. But this leads him to a deeper question - why does our universe seem to have been set up with just the right rules to create us? In a dizzying conclusion Brian unpicks this question, revealing the very latest understanding of how the universe came to be this way, and in doing so offers a radical new answer to why we are here.

We live in a galaxy with over 200 billion star systems, many of which will be home to planets which could support life. The question is: is there anybody there? After all, if the universe has thrown up one intelligent civilisation - us - why not more? Brian Cox investigates our human urge to contact alien intelligence, visiting the deserts of Northern California to join the hunt using the world's most sensitive alien hunting radio telescope.

Professor Brian Cox explores our origins, place and destiny in the universe. We all start our lives thinking that we are at the centre of the universe, surrounded by our family and the world as it spins around us. But the urge to explore is strong. Brian tells the story of how our innate human curiosity has led us from feeling that we are at the centre of everything, to our modern understanding of our true place in space and time - that we are living 13.8 billion years from the beginning of the universe, on a mere speck of rock in a possibly infinite expanse of space.

Brian concludes the series by returning to the top of the world in Svalbard, where he gains access to our civilisation's greatest treasure, locked away in a vault buried deep in the permafrost. Join him as he unlocks the secret of our long term survival.