Christopher Lee

Character: Prof. Sir Alexander Saxton

Peter Cushing

Character: Dr. Wells

Telly Savalas

Character: Captain Kazan

Alberto de Mendoza

Character: Father Pujardov

Silvia Tortosa

Character: Countess Irina Petrovska

Julio Peña

Character: Inspector Mirov

Ángel del Pozo

Character: Yevtushenko

Helga Liné

Character: Natasha

Alice Reinheart

Character: Miss Jones

José Jaspe

Character: Conductor Koniev

George Rigaud

Character: Count Maryan Petrovski

Víctor Israel

Character: Luggage Worker

Faith Clift

Character: American Passenger, Miss Bennett (uncredited)

Juan Olaguibel

Character: Creature

José Marco

Character: Vorkin

José Canalejas

Character: Russian Guard

Vicente Roca

Character: Station Master

Hiroshi Kitatawa

Character: Grashinski - the Locksmith (uncredited)

Barta Barri

Character: First Telegraphist

Peter Beckman

Character: Second Telegraphist (uncredited)

Allen Russell

Character: Capt. O'Hagan (uncredited)

Fernando Villena

Character: (uncredited)

Robert Rietti

Character: Father Pujardov (voice)

Olive Gregg

Character: Countess Irina Petrovski / Natasha / Miss Jones (voice)

Roger Delgado

Character: Inspector Mirov (voice)