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