The Hitchhiker’s Guide to the Galaxy The Hitchhiker’s Guide to the Galaxy (also known as HG2G, HHGTTG or H2G2) is a comedy science fiction novel written by Douglas Adams. The book is a part of a “trilogy” of five books. It was first published in 1978 as a radio series on BBC. Later it got adapted to other formats for example stage shows, novels, comic books, TV series, a video game and a movie made in 2005. The Hitchhiker’s Guide to the Galaxy has become an international phenomenon in social media