"Don't Panic: The Official Hitchhiker's Guide to the Galaxy Companion," originally published in 1988, is a humorous reference book by British writer Neil Gaiman. The book serves as a comprehensive guide to the creation and development of Douglas Adams' beloved science fiction series, "The Hitchhiker's Guide to the Galaxy," covering its evolution from radio to novels, television, and beyond. Offering insights into Adams' creative process and the cultural impact of his work, "Don't Panic" blends Gaiman's witty narrative style with anecdotes and behind-the-scenes details, making it an essential read for fans of the iconic series.