Dr. Moriarty (archive footage)

Dr. Joseph Van Ee (archive footage)

Dr. Cameron (archive footage)

Prof. Lampini (archive footage)

Egyptian Ambassador (uncredited)

Father Robert Stuart

The Voice

Judge Mackenzie

H.G. Danziger

Dubocage

The Judge

Dr. Fortescue

Constable of Clervaux

The Viceroy

Otto Dagoff

Palanth, the High Priest

Doc Robbin

Marquis De Carvajal

Paul Stertorius

Father Donnard

H.R. Barrett

Craxton

Dr. Josef Van Ee

Mr. Mallam

Prof. Andrew Forbes

Dr. Pavel Storasky

Detective Geddes

Bey of Aribajan

Jelke

Horadef

King aka The Great Movel

Security Council Chair

Leo Grainger

Prof. Bruno Lampini

Frank Swift

Fahrenburg

Ape Man

Andoheb, High Priest of Arkan

Nicholas

Tony Rocco

Dr. Alfred Morris

Mr. Crepitude

Amos Bradford

Lloyd Clayton / Elwyn Clayton

Heinrich Hinckel aka Richard Stanley

Lord Denby

Andoheb

Dr. Robert Renault

Peter van Hoost

Lorenzo Cameron

Dr. Hugo Streger

Dr. Edwin L. Jannery

Webster

Defense Attorney

Dr. Jeris

Dr. Parry

Abbadi

Prison Governor

Professor Andoheb

Vicomte Ribaud

Procurator

Lawyer Crosby

James K. Spaulding

Professor Moriarty

Dr. Luis Virgo

Arnold Trist

Dr. Cardigan

Rolf Alferson

Prime Minister

Dr. Waxton

Governor of Conciergerie (uncredited)

Otto Brockler

James 'Jim' Hampstead

Prefect of Police

General Maroff

Secret Service Chief

Count Armalia

Dr. LaFarge

Woodley

Inspector Jefferson

Dr. Bierd

Sir Charles Arthur Russell

Dr. Adolph Kammer

Crowley Bascomb

The Colonel's Butler

Dr. Pyke

Officer of the Firing Squad

Foot

Convict

Proprietor of the Maison de Paris

Hotel Manager

Inspector Hull

Bailiff

Revered Mayne

Fauntley

James Renton

Squire

Lord Dore

Prosecutor (uncredited)

Jacques Marie Eugène Godefroy Cavaignac