The Gremlins is a children's book, written by Roald Dahl and published in 1943. It was Dahl's first children's book and was written for Walt Disney Productions, as a promotional device for a feature-length animated film that was never made. With Dahl's engaging storytelling and charming illustrations, the book introduces the concept of gremlins as mischievous creatures that cause malfunctions in British Royal Air Force aircraft.