This animated/real-life short traces the history of mankind's search for that indefinable force which moves the universe: energy. It shows how man, from the caveman to the present, discovered energy: from primitive tools and machines to nuclear power. Sources of energy are examined, such as water, wind, coal, oil, electricity and the sun. Such future sources of energy as harnessing waves/tide and atomic fusion are mentioned. Most of the film is animated, ut several real-ife clips are interspersed.