NOVA explores the mighty Colorado River which today has become the life-blood of the Southwest, providing water and electricity to the farms and cities of California, Nevada, and Arizona. The program examines the political expediency and technological over-optimism that has led to some major miscalculations of the river's capacity.

Does life exist outside this planet? The Viking lander will set down on Mars in July 1976 to try to find out just that. NOVA explores how life started on Earth and examines the Viking Lander being built in its germ-free room before starting its long journey.