David Agnew was a pseudonym used by Graham Williams and other writers to write under.
- Douglas Adams co-wrote Shada with then producer Graham Williams under the pseudonym David Agnew.
- Anthony Read collaborated with Graham Williams (as David Agnew) to write The Invasion of Time.
- Douglas Adams and Graham Williams put together the final scripts for City of Death after David Fisher's scripts didn't meet their approval, City of Death was credited to David Agnew.