Austin Parsons
Father Anthony (1 episode)
Dr. Jubal Harrington
Sir Wilfrid Lucas
The Prime Minister
Gov. Oliver P. Thornwall
Sir John Dalman (1 episode)
Charles Manning
Henry Addison
Dr. Morgan (1 episode)
Judge (1 episode)
Insp. Charas
Robert Harley Hedges
Colonel Beaumont (1 episode)
Bo Barrett (1 episode)
Judge Connors (1 episode)
Colin Bragner (1 episode)
Insp. Mackenzie
Stephen Collins
Lord Leicester
Self - Mystery Guest (1 episode)
William, Earl of Mackworth
Dr. Van Ness
Dr. Donald L. Stanton / Narrator
Mr. Charles Tremayne
Self -Host (39 episodes)
Inspector Goole (1 episode)
Dr Jameson
Dr. James Curtis
E.J. Stanton
Archibald Craven
Willard I. Whitcombe
Miles Rushworth
Scott Chavez
W. Somerset Maugham
Traybin
Dr. Charles Evans
Major John Hillgrove
Dr. Standish
Prof. Michael Kingsley
Paul Turner
Curate in Air Raid Shelter
Geoffrey Wolfe
John Davis
Rogers Woodruff
Horace Giddens
Sen. John Coleridge
Robert Crosbie
Stephen Fisher
Gray Meredith
Dufresne
Stephen Holland
Jim Howard
Richard Todd
Sir Frederick Barker
Jonathan Blair
Christopher 'Chris' Drew
Thomas Lane
Dr. Stephen Dominik
Alan Barclay
Dr. Michael J. Talbot
Jim Buchanan
Gerald Shannon
Steven Gaye
Dr. Gordon Phillips
Doctor Sporum
Walter Fane
Napier
Lord Philip Rexford
Arnold Ainger
Oliver Lane
Stephan
Count Franz von Degenthal
Gaston Monescu
Edward 'Ned' Faraday
Waverly Ango
Michael Rowe
Gerry Anson
Lord Danforth
Sir John Menier
Geoffrey Hammond
Col. Armytage