The Hitchhiker's Guide to the Galaxy cast lists

Main cast
♦ "The Rainbow" production  ♥ Science Fiction Theatre of Liverpool production  ♠ Theatr Clwyd Production

Additional cast for the Secondary Phase

 * Covering the BBC Radio 4 Secondary Phase (1979—1980).

Additional cast for the Tertiary to Quintessential Phases

 * Covering the BBC Radio 4 radio series 3-5 (2004–2005) and the Bavarian Radio/Southwest radio adaptations in 1990-1991.