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 Tertiary to Hexagonal Phases credits. There was even a cameo role by Adams himself (who had died in 2001) as Agrajag, edited from his BBC audiobook recording of the novel. The original novel was based on a treatment that Adams wrote for an unmade Doctor Who movie, Doctor Who and the Krikketmen. The idea was re-proposed during Tom Baker's tenure in the title role, and again for a potential (but unmade) second television series of "The Hitchhiker's Guide to the Galaxy". Before the final episode was broadcast, BBC Worldwide released the Tertiary Phase on CD, including additional material. A DVD of the series was