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| Film Credits |
| |
| NO PROBLEM - THE THEATRE OF KEN CAMPBELL | 1981 | on-screen participant |
| ECOLOGICAL DESIGN - INVENTING THE FUTURE | US, 1994 | interviewee |
| THE HITCHHIKER'S GUIDE TO THE GALAXY | US/UK, 2005 | screenplay; original book; executive producer |
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| Television Credits |
| |
| OUT OF THE TREES | BBC2 tx 10/1/1976 | script |
| DOCTOR ON THE GO: For Your Own Good | ITV tx 20/2/1977 | script |
| DOCTOR WHO: The Pirate Planet | BBC1 tx 30/9 - 21/10/1978 (4 pts) | script |
| DOCTOR WHO: The Armageddon Factor | BBC1 tx 20/1 - 24/2/1979 (6 pts) | script editor (uncredited) |
| DOCTOR WHO: The Destiny of the Daleks | BBC1 tx 1 - 22/9/1979 (4 pts) | script editor |
| DOCTOR WHO: City of Death | BBC1 tx 29/9 - 21/10/1979 (4 pts) | script editor; script (as 'David Agnew') |
| ThE BOOK PROGRAMME: Into the Unknown | BBC2 tx 17/10/1979 | on-screen participant |
| DOCTOR WHO: The Creature from the Pit | BBC1 tx 27/10 - 17/11/1979 (4 pts) | script editor |
| DOCTOR WHO: Nightmare of Eden | BBC1 tx 24/11 - 15/12/1979 (4 pts) | script editor |
| DOCTOR WHO: The Horns of Nimon | BBC1 tx 22/12/1979 - 12/1/1980 (4 pts) | script editor |
| DOCTOR WHO: Shada | 6-part serial intended for BBC1, shooting abandoned following strike | script editor; script |
| A BETTER READ: Humorous Stories | ITV tx 2/3/1980 | interviewee |
| OPEN DOOR | BBC tx 22/3/1980 | on-screen participant |
| THE HITCH-HIKER'S GUIDE TO THE GALAXY | BBC2 tx 5/1 - 9/2/1981 (6 pts) | script; author of the original work |
| PAPERBACKS | BBC1 tx 15/4/1981 | interviewee |
| HYPERLAND | BBC2 tx 21/9/1990 | script; presenter |
| CLIVE ANDERSON TALKS BACK | Channel 4 tx 1/11/1991 | guest |
| THE SOUTH BANK SHOW: Douglas Adams | ITV tx 5/1/1992 | subject of programme |
| HAVE I GOT NEWS FOR YOU | BBC2 tx 11/12/1992 | on-screen participant |
| CYBERPUNKS AND TECHNOPHOBES | BBC2 tx 22/11/1993 | on-screen participant |
| THE AGENDA | ITV tx 11/8/1996 | on-screen participant |
| CYBERSPACE: Electroculture | ITV tx 8/12/1996 | on-screen participant |
| MARIELLA FROSTRUP'S BRUNCH | Channel 5 tx 22/2/1998 | on-screen participant |
| THE JACK DOCHERTY SHOW | Channel 5 tx 19/3/1998 | interviewee |
| NATURAL SELECTIONS | BBC2 tx 28/3/1998 | on-screen participant |
| OPEN HOUSE WITH GLORIA HUNNIFORD | Channel 5 tx 18/5/2000 | guest |
| WHAT A PERFORMANCE: Madcap | ITV tx 15/8/2000 | presenter |
| OMNIBUS: Douglas Adams - The Man Who Blew Up The Ear | BBC2 tx 4/8/2001 | subject of programme; interviewee (archive footage) |
