Prof. Pierre Arronax
Dr. Hartz
Stein
Nicholas 'Nick' Bederaux
Arnold Iselin
Dr. Steinfeldt
Gus Hoffman
Big Fellow Maskal
Dr. Bernhardt
Parada
Albert Frédéric
Sir Meyer Isaacson
Prof. Bhaer
Kurt Müller
Adolph Mohler
Hessler
Baron Philip de Beaufort
Karl von Hartrott
Inspector Marcel Bonet
Philo Vance
W. S. Bruhl
Antonie 'Tony' de Sola
Dr. Kassell
Lama
Martin Schulz
Baron Saradin
Athos
François Dupré
Albert
Captain Walter Brink
Peter Stanislavsky
Capo Riccione
Phil Carida
Baron von Helsing
Josef
Walter Bernsdorf
Tino Caraffa, aka "Gus" Diruvo
Colonel Carl Ehrlich
John Barta
Eric
Berci
Self (archive footage) (uncredited)
Dr. Karl Bemis
Anton Kronsky
Reinhardt
Boris
Robert Lenhart
Louie Zoltini
Stephen Lucarno
Yuan Sing
Prof. Paul Bernardy
Gáthy Lõrinc (as Lukács Pál)
Don Ramon de Linea
Colin Graham
Flambeau
Stephan Norman
Dr. Reynolds
Bailey
Rupert von Marwitz
Dr. Joseph Von Schrader
Dr. Nagy
Ken
Lt. Kurt Kurtoff
Von Baden
Boris Renov
Self
Saint Denis
Dr. Nicholas Faber
Victor Banki
Nick Pogli
Victor Gresham
Gustave Saxon
The General's Son Vladimir
Self
Count Dietrich Wallentin
Dr. Durande
The Corpse
Hungarian Professor
Jack Pethurst
Michael Morda
Rumowski
Malatroff
Ettore Ricco, the Tenor
Charles Lagarde
Gordon-Philips György herceg (as Lukács Pál)
Maximillian Dauphin
Self (archive footage)
David Tyler
Paul Vadja
Dr. Dohmler
James Clayton
Ernst Janning
Ambassador Korvin
Gabbo the Great
Dr. Werner
Franz Kralik
Charles Lagarde
Anton Dieter
Dr. Leitner
Ernst Janning
Baron Vincennes
Captain Lindemann
Karl Messerman