Lord Kensington (uncredited)
Guy Penrose (1 episode)
Commodore Newcombe (1 episode)
Quizmaster / Collie (voice)
Dr. Feodor Orloff
Ian Hunt
Harry Nagle (1 episode)
Sinclair (1 episode)
George Willis (1 episode)
Dr. Roland Gerard
Gerry Monte aka Sabourin
Timothy Chappel
Sir Roderick Strood
Tom Martin
Tom Martin
Sir Kay
Maharajah
Tom Conway, Private Investigator
Norman Conquest
Narrator (voice)
Roger Kingsley
Bennington
Dr. Viet
John Campbell
Christopher Adams
Whitfield Savory
Dr. Michael Madden
Capt. Hugh 'Bulldog' Drummond
Capt. Hugh 'Bulldog' Drummond
John Friday
Jefferson Van Orsdale Jr.
Dr. Robert Davis
Tom "The Falcon" Lawrence
Steve Barnes
Tom Lawrence
Lew Lentz
Tom Lawrence / The Falcon
Theodore 'Step' Allison
Tom Lawrence
Tom Lawrence, aka The Falcon
Mark Latham
Tom Lawrence / The Falcon
Tom Lawrence, the Falcon
Dr. Louis Judd
Tom Lawrence / The Falcon
Paul Holland
Tom Lawrence
Dr. Louis Judd
Tom Lawrence
Man (uncredited)
Frankie Ciro
Maurice Craindall
Louis Berex
Mr. Blanton
Mr. Channing
Morgan Pell
Captain Ferris
Edgar Wayne
Andrew Hendon
(voice) (uncredited)