And Another Thing...Main article: And Another Thing... (novel)
It was announced on 17 September 2008 that Artemis Fowl author Eoin Colfer has been commissioned to write the sixth instalment entitled And Another Thing... with Jane Belson, Adams' widow, giving her approval.[17][18] The book is intended to be published by Penguin Books in the UK and Hyperion in the US in October 2009.[17][19]
The Salmon of DoubtMain article: The Salmon of Doubt
The Salmon of Doubt: Hitchhiking the Galaxy One Last Time is a posthumous collection of previously uncollected material by Douglas Adams, published in 2001.
Other booksDouglas Adams and Geoffrey Perkins collaborated on The Hitchhiker's Guide to the Galaxy: The Original Radio Scripts, first published in the United Kingdom and United States in 1985. A tenth-anniversary (of the script book publication) edition was printed in 1995, and a twenty-fifth-anniversary (of the first radio series broadcast) edition was printed in 2003.
A short story was also written, "Young Zaphod Plays it Safe". This story first appeared in The Utterly Utterly Merry Comic Relief Christmas Book, a special large-print compilation of different stories and pictures that raised money for the new (at the time) Comic Relief charity in the UK. It is in The Ultimate Hitchhiker's Guide To The Galaxy which contains the five classic novels from the Hitchhiker series: The Hitchhiker's Guide to the Galaxy, The Restaurant at the End of the Universe, Life, the Universe and Everything, So Long, and Thanks for All the Fish, Mostly Harmless as well as Young Zaphod Plays it Safe. It also appears in some of the omnibus editions of the trilogy, and in The Salmon of Doubt. It is almost, but not quite, entirely unrelated to the rest of the trilogy. There are two versions of this story, one of which is slightly more explicit in its political commentary.
A novel, Douglas Adams's Starship Titanic written by Terry Jones, is based on Adams's computer game of the same name, which in turn is based on an idea from Life, the Universe and Everything.
Wowbagger the Infinitely Prolonged, a character from Life, the Universe and Everything, also appears in a short story by Adams titled "The Private Life of Genghis Khan" which appears in some early editions of The Salmon of Doubt.
For some information on understanding the philosophy of the Guide, or Douglas Adams's influence on technology, see The Anthology at the End of the Universe, a series of essays edited by Glenn Yeffeth, published in 2005.
Michael Hanlon published The Science of The Hitchhiker's Guide to the Galaxy in 2005. Topics include space tourism, parallel universes, instant-translation devices such as the Babel fish and sentient computers.
Dirk Maggs, who adapted and dramatised the last three novels for radio, released a collection of their scripts in July 2005, with Maggs providing notes for each episode. This second radio script book is entitled The Hitchhiker's Guide to the Galaxy Radio Scripts: The Tertiary, Quandary and Quintessential Phases. Douglas Adams gets the primary writer's credit (as he wrote the original novels), and there is a foreword by Simon Jones, introductions by Bruce Hyman and Dirk Maggs, and other introductory notes from other members of the cast.
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