Thorium is a better, safer, cheaper and more prolific replacement for uranium. It deserves to be given the title "The Eighth Element", following Lord Browne's book "Seven Elements That Have Changed the World". He lists iron, carbon, gold, silver, uranium, titanium and silicon. This report explains why thorium should be added to the list. It sets out the case for thorium as a nuclear fuel, explaining why it is safer, cheaper, and should be more acceptable to the public than uranium. It explains how thorium can be used in power plants, and compares its safety features to those of traditional plants. The report also examines the companies that are developing thorium as a clean, safe energy source. In the wake of the Fukushima nuclear disaster and in the face of a looming energy crisis, this report is timely and significant.