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 | 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 | |||
| 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" | ||