This series tells the story of the race to discover the structure of DNA, and the scientists who changed our understanding of the world and everything in it. It also looks at the implications of their work for the future of mankind.

In 1953, Jim Watson and Francis Crick were credited with uncovering the double-helix structure of DNA - one of the greatest scientific discoveries of the 20th century - but amidst all the plaudits there were underlying rumours of plagiarism.

More controversy followed in the 70s when scientists were accused of 'playing god' after transferring DNA from one species to another. These early experiments triggered a fierce debate about the dangers of genetic manipulation but also generated a multi-billion dollar industry.

As the 20th century drew to a close it became clear that DNA research could be used to both fight disease and trace human origins. Opposing sides fought bitterly over the rights of big business to profit from the biological information that makes a human being.

The final programme presents a vision for the future of the human race that many may find disturbing. A world fed on GM food, where the handicapped are terminated in pregnancy and people have the ability to genetically transform their intelligence and appearance.