It's Christmas 1940, and Everytown resident John Cabal (Raymond Massey) fears that war is imminent. When it breaks out, the war lasts 30 years, destroying the city and ushering in a new dark age of plagues and petty despots. But there is hope in the form of Wings Over the World, a group of pacifist scientists and thinkers lead by Cabal. Their dream is to build a utopian society on the ruins of the old. But first they'll have to unseat the latest ruling tyrant (Ralph Richardson).