== 1978 ==
Douglas Adams delivered the scripts for episodes two to four of the Doctor Who adventure The Pirate Planet.The Primary Phase (fits 1-6) of the HHGG radio series was broadcast on BBC Radio 4.Fit 7, the Christmas episode (and what would become episode one of the Secondary Phase), was broadcast on BBC Radio 4.== 1979 ==
Pan Books publish the HHGG book in Britain (which was an expanded fits 1-4).Original Records release the HHGG double album (which was a contracted fits 1-4).== 1980 ==
The rest of the Secondary Phase (fits 8-12) of the HHGG radio series broadcast on BBC Radio 4Pan Books publish The Restaurant At The End Of The Universe in Britain (contracted fits 7-12, 5-6)Harmony Books publish the first book in the United StatesThe album of The Restaurant At The End Of The Universe recorded (expanded fits 5 and 6)ZZ9 Plural Z Alpha formed== 1981 ==
Six television episodes aired by the BBC, based on fits 1-6 (used revision made in the books)== 1982 ==
Harmony Books publishes The Restaurant At The End Of The Universe in the United StatesLife, The Universe And Everything published simultaneously in Britain and the U.S.== 1983 ==
The Meaning of Liff with John Lloyd was released.== 1984 ==
So Long, And Thanks For All The Fish published simultaneously in Britain and the U.S.HHGG Text Adventure released== 1985 ==
Harmony publishes The Original HHGG Radio Scripts in the U.S.Pan Books release the same book in the UK as HHGG: The Original Radio ScriptsLazlar Lyricon, the Hitchhiker’s Guide convention, held== 1987 ==
Dirk Gently's Holistic Detective Agency hardback publishedBureaucracy computer game released== 1988 ==
The Long Dark Tea-Time of the Soul hardback publishedDon't Panic: The Official Hitch Hiker's Guide to the Galaxy Companion by Neil Gaiman published== 1989 ==
The More Than Complete Hitchhiker's Guide published in the U.S. by Wings Books== 1990 ==
Last Chance to See published== 1991 ==
The Deeper Meaning of Liff with John Lloyd publishedLast Chance to See CD-ROM released== 1992 ==
Mostly Harmless published== 1993 ==
The newly-revised and updated Don't Panic: Douglas Adams and the Hitchhiker's Guide to the Galaxy published== 1994 ==
The Illustrated HHGG published== 1995 ==
The Original Radio Scripts re-released== 1996 ==
A Trilogy in Five Parts released.== 1997 ==
Dirk (the stageshow of Dirk Gently) performed to great critical acclaim at the Oxford PlayhouseStarship Titanic – the computer game by The Digital Village and the book by Terry Jones – released== 1998 ==
Can’t remember anything good happening in 1998…== 2000 ==
…or 2000 for that matter== 2001 ==
Douglas Adams passed away on 11 May 2001, aged 49. This is a lot worse than nothing good happening== 2003 ==
Probably some definite talk of the movie and third radio series by this time== 2004 ==
The Tertiary Phase (fits 13-18) of the HHGG radio series broadcast on BBC Radio 4== 2005 ==
The Quandary Phase (fits 19-22) and Quintessential Phase (fits 23-26) of the HHGG radio series are broadcast on BBC Radio 4The HHGG film is released (it took them long enough…)The Hitchhiker's Guide to the Galaxy Radio Scripts: The Tertiary, Quandary and Quintessential Phases (now there’s a catchy title) published by Pan