What is the theme in The Midwich Cuckoos?

The theme of The Midwich Cuckoos is the fear of the unknown and the potential dangers of scientific advancement. The novel explores the idea of a group of children who are born with superior intelligence and strange powers, and the way in which they disrupt the lives of the people in the town of Midwich. The novel raises questions about the ethics of scientific experimentation, the nature of humanity, and the potential dangers of unchecked scientific progress.