George Zucco

as Dr. Moriarty (archive footage)

as Dr. Joseph Van Ee (archive footage)

as Dr. Cameron (archive footage)

as Prof. Lampini (archive footage)

as self

as Egyptian Ambassador (uncredited)

as Father Robert Stuart

as The Voice

as Judge Mackenzie

as H.G. Danziger

as Dubocage

as Judge

as Dr. Fortescue

as Constable of Clervaux

as The Viceroy

as Otto Dagoff

as Palanth, the High Priest

as Doc Robbin

as Marquis De Carvajal

as Paul Stertorius

as Father Donnard

as H.R. Barrett

as Craxton

as Dr. Josef Van Ee

as Mr. Mallam

as Prof. Andrew Forbes

as Dr. Pavel Storasky

as Detective Geddes

as Bey of Aribajan

as Jelke

as Horadef

as King aka The Great Movel

as Security Council Chair

as Leo Grainger

as Prof. Bruno Lampini

as Frank Swift

as Fahrenburg

as Ape Man

as Andoheb, High Priest of Arkan

as Nicholas

as Tony Rocco

as Dr. Alfred Morris

as Mr. Crepitude

as Amos Bradford

as Lloyd Clayton / Elwyn Clayton

as Heinrich Hinckel aka Richard Stanley

as Lord Denby

as Andoheb

as Dr. Robert Renault

as Peter van Hoost

as Lorenzo Cameron

as Dr. Hugo Streger

as Dr. Edwin L. Jannery

as Webster

as Defense Attorney

as Dr. Jeris

as Dr. Parry

as Abbadi

as Prison Governor

as Professor Andoheb

as Vicomte Ribaud

as Lawyer Crosby

as James K. Spaulding

as Professor Moriarty

as Procurator

as Dr. Luis Virgo

as Arnold Trist

as Dr. Cardigan

as Rolf Alferson

as Prime Minister

as Dr. Waxton

as Governor of Conciergerie (uncredited)

as Otto Brockler

as James 'Jim' Hampstead

as Prefect of Police

as General Maroff

as Secret Service Chief

as Count Armalia

as Dr. LaFarge

as Woodley

as Inspector Jefferson

as Dr. Bierd

as Sir Charles Arthur Russell

as Dr. Kammer

as Crowley Bascomb

as The Colonel's Butler

as Dr. Pyke

as Officer of the Firing Squad

as Foot

as Convict

as Proprietor of the Maison de Paris

as Hotel Manager

as Inspector Hull

as Bailiff

as Revered Mayne

as Fauntley

as James Renton

as Squire

as Lord Dore

as Prosecutor (uncredited)

as Jacques Marie Eugène Godefroy Cavaignac