Cast

• Christopher Lee Prof. Sir Alexander Saxton
• Peter Cushing Dr. Wells
• Alberto de Mendoza Father Pujardov
• Silvia Tortosa Countess Irina Petrovski
• Julio Peña Inspector Mirov
• Ángel del Pozo Yevtushenko (as Angel del Pozo)
• Telly Savalas Captain Kazan
• Helga Liné Natasha
• Alice Reinheart Miss Jones (as Alice Reinhart)
• José Jaspe Conductor Konev (as Jose Jaspa)
• George Rigaud Count Marion Petrovski (as Jorge Rigaud)
• Víctor Israel Maletero - the Baggage Man
• Faith Clift American Passenger (as Faith Swift)
• Juan Olaguivel Creature (as Juan Olaguibel)
• Barta Barri First Telegraphist
• Peter Beckman Second Telegraphist
• Hiroshi Kitatawa Grashinski (as Hiroshi Kitazawa)
• Vicente Roca Station Master
• José Canalejas Russian Guard
• José Marco Vorkin
• Allen Russell Captain O'Hagan
• Fernando Villena (uncredited)

Writers

• Julian Zimet
• Arnaud d'Usseau

Producers

• Gregorio Sacristán
• Bernard Gordon