The story of a century: a decades-long second World War leaves plague and anarchy, then a rational state rebuilds civilization and attempts space travel.
Filmed on location in England and Morocco, the story concerns 13th-century Saxon nobleman Walter of Gurnie, who, after sparking an unsuccessful rebellion against the Norman conquerors of his homeland, sets out to seek his fortune in the Far East.
While looking through his telescope one night, John Putnam (Richard Carlson) sees what at first appears to be a meteor shower -- but it is actually a crash-landing alien spaceship! After investigating the crater from the impact, John informs the town sheriff (Charles Drake), and receives nothing but ridicule. Even his fiancée, Ellen (Barbara Rush), is skeptical. All that changes when the townsfolk start disappearing, and are replaced by eerie alien duplicates.
After John Haloran (Peter Read) dies, his wife, Louise (Luana Anders), fears that she will be denied his inheritance. Fabricating a story about John traveling to the United States, she joins the rest of the Haloran family at their Irish estate as they hold a memorial for John's sister, who died in a lake eight years ago. Louise schemes to convince Lady Haloran (Eithne Dunne) that she can speak with the dead child. However, this plan is interrupted by an axe murderer loose on the estate.
Juan Gallardo (Valentino), a village boy born into poverty, grows up to become one of the greatest matadors in Spain. He marries a friend from his childhood, the beautiful and virtuous Carmen (Lee), but after he achieves fame and fortune he finds himself drawn to Doña Sol (Naldi), a wealthy, seductive widow.
An `unknown force' declares war against planet Earth when the United Nations disobeys warnings to cease and desist in its attempts at assembling the first satellite in the atmosphere.
Vince Rinaud is a former film special effects artist who is disfigured by Max Block, the head of Paragon Pictures, and also a rival for the affections of a woman (Anne Helm). Leaving the film industry, Vince becomes a recluse and opens a wax museum. Within a few months, four popular Paragon stars disappear. Suspiciously wax figures of the missing stars soon feature as wax models in the museum.