Welcome to Hitchhikers Wiki!
First published as a comedic radio series in 1978, Douglas Adams' SF adventure series became an international multi-media phenomenon. His trilogy in six parts (the last being written by Eoin Colfer) has received acclaim through the years.
There have been many other adaptations from the original radio series, such as television series and comic book adaptations. Then the Hitchhiker's film and computer game were developed.