| Date |
Medium |
Title |
| March 8 – April 12, 1978 |
|
Radio series |
Primary Phase: "Fit the First" to "Fit the Sixth" |
| December 24, 1978 |
|
Radio series |
Christmas Special, which became Secondary Phase: "Fit the Seventh" |
| May 1–9, 1979 |
|
Stage show |
The Hitchhiker's Guide to the Galaxy (ICA) |
| 1979 |
|
Record |
The Hitchhiker's Guide to the Galaxy |
| October 1979 |
|
Novel |
The Hitchhiker's Guide to the Galaxy |
| January 21–25, 1980 |
|
Radio series |
Secondary Phase: "Fit the Eighth" to "Fit the Twelfth" |
| January 15 – February 23, 1980 |
|
Stage show |
The Hitchhiker's Guide to the Galaxy (Theatr Clwyd) |
| 1980 |
|
Record |
The Hitchhiker's Guide to the Galaxy Part Two: The Restaurant at the End of the Universe |
| October, 1980 |
|
Novel |
The Restaurant at the End of the Universe |
| July 13 – August 2[1] 1980 |
|
Stage show |
The Hitchhiker's Guide to the Galaxy (Rainbow) |
| January 5 – February 9, 1981 |
|
TV series |
The Hitchhiker's Guide to the Galaxy |
| 1982 |
|
Novel |
Life, the Universe and Everything |
| October 1984 |
|
Computer game |
The Hitchhiker's Guide to the Galaxy |
| November 1984 |
|
Novel |
So Long, and Thanks for All the Fish |
| 1985 |
|
Radio scripts |
The Hitchhiker's Guide to the Galaxy: The Original Radio Scripts |
| 1986 |
|
Short story |
"Young Zaphod Plays It Safe" |
| 1992 |
|
Novel |
Mostly Harmless |
| May 11, 2001 |
Death of Douglas Adams |
| September 21 – October 26, 2004 |
|
Radio series |
Tertiary Phase: "Fit the Thirteenth" to "Fit the Eighteenth" |
| April 28, 2005 |
|
Film |
The Hitchhiker's Guide to the Galaxy |
| May 3–24, 2005 |
|
Radio series |
Quandary Phase: "Fit the Nineteenth" to "Fit the Twenty-Second" |
| May 31 – June 21, 2005 |
|
Radio series |
Quintessential Phase: "Fit the Twenty-Third" to "Fit the Twenty-Sixth" |
| March 12,[2] 2008 |
|
Stage show |
Live reading of Fit the Second (by the original cast) at the 6th Douglas Adams Memorial Lecture. |
| October 11,[3] 2009 |
|
Stage show |
Hitchhikers Live On Stage! at Hitchcon event for publication of sixth book (below). |
| October 12, 2009 |
|
Novel |
And Another Thing..., by Eoin Colfer |
| June 8 – July 21, 2012 |
|
Stage show |
The Hitchhiker's Guide to the Galaxy Radio Show Live |
| September 14 – October 20, 2013 |
|
Stage show |
The Hitchhiker's Guide to the Galaxy Radio Show Live (Planned to run to November 30, the show closed early.) |
| March 29, 2014 |
|
Radio show |
The Hitchhiker's Guide to the Galaxy, a live radio broadcast in front of an audience as part of Radio 4's Character Invasion Day |
| March 8 – April 12, 2018 |
|
Radio series |
Hexagonal Phase: "Fit the Twenty-Seventh" to "Fit the Thirty-Second" |