cast
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Christopher Lee
Prof. Sir Alexander Saxton
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Peter Cushing
Dr. Wells
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Telly Savalas
Captain Kazan
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Alberto de Mendoza
Father Pujardov
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Silvia Tortosa
Countess Irina Petrovska
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Julio Peña
Inspector Mirov
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Ángel del Pozo
Yevtushenko
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Helga Liné
Natasha
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Alice Reinheart
Miss Jones
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José Jaspe
Conductor Koniev
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George Rigaud
Count Maryan Petrovski
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Víctor Israel
Luggage Worker
- Faith Clift American Passenger, Miss Bennett (uncredited)
- Juan Olaguibel Creature
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José Marco
Vorkin
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José Canalejas
Russian Guard
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Vicente Roca
Station Master
- Hiroshi Kitatawa Grashinski - the Locksmith (uncredited)
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Barta Barri
First Telegraphist
- Peter Beckman Second Telegraphist (uncredited)
- Allen Russell Capt. O'Hagan (uncredited)
- Fernando Villena (uncredited)
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Robert Rietti
Father Pujardov (voice)
- Olive Gregg Countess Irina Petrovski / Natasha / Miss Jones (voice)
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Roger Delgado
Inspector Mirov (voice)