The Hitchhiker's Guide to the Galaxy: The Original Radio Scripts contains a new introduction by Geoffrey Perkins, and newly researched material by M. J. Simpson, including a transcript of "The Lost Hitchhiker Sketch." The sketch was an interview with Simon Jones in character as Arthur Dent, conducted by Sheila Steafel on her show "Steafel Plus" in 1982, written entirely by Adams. The sketch can be heard in the "Douglas Adams at the BBC" CD collection. The book now contains transcripts of all Hitchhikers radio sketches, barring a sketch for Marvin that Adams wrote for the BBC Radio 1 show Studio B15 to promote the television version of the serial, which
The Hitchhiker's Guide to the Galaxy Millennium Audio () in the United States and available from BBC Audiobooks in the United Kingdom. Also by arrangement with Dove, ISIS Publishing Ltd produced a numbered exclusive edition signed by Douglas Adams () in 1994. To tie-in with the 2005 film, actor Stephen Fry, the film's voice of the Guide, recorded a second unabridged edition (). In addition, unabridged versions of books 2-5 of the series were recorded by Martin Freeman for Random House Audio. Freeman plays Arthur in the 2005 film adaptation. Audiobooks 2-5 follow in order and include: "The Restaurant at the End of the Universe" ();