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.

Source: Wikipedia — The Hitchhiker's Guide to the Galaxy cast lists (CC BY-SA 4.0)