Professor Jim Al-Khalili tells the story of our quest to master nature's most mysterious force - electricity. This series tells of dazzling leaps of imagination and extraordinary experiments, a story of maverick geniuses who used electricity to light our cities, communicate across the seas and through the air, create modern industry and give us the digital revolution. Electricity is not just something that creates heat and light, it connects the world through networks and broadcasting. After centuries of man's experiments with electricity, the final episode tells the story of how a new age of real understanding dawned - how we discovered electric fields and electromagnetic waves. Today we can hardly imagine life without electricity - it defines our era. As our understanding of it has increased so has our reliance upon it, and today we are on the brink of a new breakthrough, because if we can understand the secret of electrical superconductivity we could again transform the world.