Christopher Lee

Prof. Sir Alexander Saxton

Peter Cushing

Dr. Wells

Telly Savalas

Captain Kazan

Alberto de Mendoza

Father Pujardov

Silvia Tortosa

Countess Irina Petrovska

Julio Peña

Inspector Mirov

Ángel del Pozo

Yevtushenko

Helga Liné

Natasha

Alice Reinheart

Miss Jones

José Jaspe

Conductor Koniev

George Rigaud

Count Maryan Petrovski

Víctor Israel

Luggage Worker

Faith Clift

American Passenger, Miss Bennett (uncredited)

Juan Olaguibel

Creature

José Marco

Vorkin

José Canalejas

Russian Guard

Vicente Roca

Station Master

Hiroshi Kitatawa

Grashinski - the Locksmith (uncredited)

Barta Barri

First Telegraphist

Peter Beckman

Second Telegraphist (uncredited)

Allen Russell

Capt. O'Hagan (uncredited)

Fernando Villena

(uncredited)

Robert Rietti

Father Pujardov (voice)

Olive Gregg

Countess Irina Petrovski / Natasha / Miss Jones (voice)

Roger Delgado

Inspector Mirov (voice)