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		Title
March 8 – April 12, 1978		Radio series	Primary Phase: "Fit the First" to "Fit the Sixth"
December 24, 1978		Radio series	Secondary Phase: "Fit the Seventh"
May 1–9, 1979		Stage show	The Hitchhiker's Guide to the Galaxy
1979		Record	The Hitchhiker's Guide to the Galaxy
July 1979		Stage show	The Hitchhiker's Guide to the Galaxy
October 1979		Novel	The Hitchhiker's Guide to the Galaxy
January 1, 1980		Novel	The Restaurant at the End of the Universe
January 21–25, 1980		Radio series	Secondary Phase: "Fit the Eighth" to "Fit the Twelfth"
January 21 – February 23, 1980		Stage show	The Hitchhiker's Guide to the Galaxy
1980		Record	The Hitchhiker's Guide to the Galaxy Part Two: The Restaurant at the End of the Universe
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"
October 12, 2009		Novel	And Another Thing..., by Eoin Colfer
June 12 - July 21, 2012		Stage show	The Hitchhiker's Guide to the Galaxy Radio Show Live