Timeline of The Hitchhiker's Guide to the Galaxy versions
# Timeline of The Hitchhiker's Guide to the Galaxy versions

This timeline shows the dates (and order of release) of all of the various media relating to Douglas Adams' The Hitchhiker's Guide to the Galaxy series. Where multiple releases/broadcasts occurred, the first one is given.

| Date | Medium | 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 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 | May 11, 2001 | 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, 2008 | | Stage show | Live reading of Fit the Second (by the original cast) at the 6th Douglas Adams Memorial Lecture. |
| October 11, 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" |
