The Tertiary Phase is the third part of the radio series The Hitchhiker's Guide to the Galaxy, first broadcast in 2004.
As Douglas Adams had died in 2001, the third novel - Life, the Universe and Everything - was adapted for radio following instructions left by him. Dirk Maggs adapted, directed and co-produced the series, with John Langdon as the script editor.
There were also a number of cast changes, due to the deaths of several original cast members, most notably Peter Jones in 2000, who was replaced as the voice of The Book by his friend William Franklyn.
See individual Fits
- The Book - Peter Jones and William Franklyn
- Arthur Dent - Simon Jones
- Ford Prefect - Geoffrey McGivern
- Trillian - Susan Sheridan
- Zaphod Beeblebrox - Mark Wing-Davey
- Marvin the Paranoid Android - Stephen Moore
- Eddie the Computer - Roger Gregg
- Wowbagger, Vogon Captain - Toby Longworth
- Zem the Mattress - Andy Taylor
- Krikkit Robots, Krikkit Commander - Dominic Hawksley
- Slartibartfast - Richard Griffiths
- Walkie Talkie - Fiona Carew
- The Boy - Theo Maggs
- Deodat - Bruce Hyman
- Henry Blofeld - Himself
- Fred Trueman - Himself
- Wikkit Voice, Elder of Krikki - Dominic Hawksley
- Agrajag - Douglas Adams
- Judiciary Pag - Rupert Degas
- Krikkit Man One, Mancunian Correcting-Fluid Magnate - Michael Fenton Stevens
- Krikkit Man Two - Philip Pope
- Krikkit Man Three - Tom Maggs
- Thor - Dominic Hawksley
- Rory Award Winner, Dispatcher, Silastic Armorfiends, Krikkit Civilian - Bob Golding
- Woman with the Sydney Opera House Head - Joanna Lumley
- Party Doorman - Paul Wickens
- Prak - Chris Langham
- Hactar - Leslie Phillips
- Announcer - John Marsh
- This phase was produced 23 years after the previous Secondary Phase.
- The Tertiary Phase opens with Arthur and Ford on pre-historic Earth, and Trillian dismisses Zaphod's experiences at the Frogstar and the Total Perspective Vortex as a "psychotic episode", practically retconning most of the Secondary Phase. However, over the course of the Tertiary, Quandary and Quintessential Phases this is somewhat reconciled.