A small-town doctor learns that the population of his community is being replaced by emotionless alien duplicates.
A mission to Venus discovers the planet inhabited only by women led by their evil Queen Yllana. Yllana had all the men of Venus killed, now that's she met Earth men, she wants them dead, too.
Shanghai, China. The last expatriate Westerners still living in the city are imprisoned in a hotel by the communist authorities in order to find the spy hiding among them.
