| Actor | Christopher Lee (as Prof. Sir Alexander Saxton), Peter Cushing (as Dr. Wells), Alberto de Mendoza (as Father Pujardov), Julio Peña (as Inspector Mirov), Ángel del Pozo (as Yevtushenko), George Rigaud (as Count Maryan Petrovski), José Jaspe (as Konev), Víctor Israel (as Begger Man), Vicente Roca (as Station Master), Barta Barri (as First Telegraphist), José Marco (as Vorkin), José Canalejas (as Russian Guard), Telly Savalas (as Capt. Kazan), Faith Clift (as Miss Bennett), Allen Russell (as Capt. O'Hagan), Fernando Villena |
| Actress | Silvia Tortosa (as Countess Irina Petrovska), Helga Liné (as Natasha) |
| Director | Eugenio Martín |
| Music | John Cacavas |
| Producer | Bernard Gordon |
Added by UG1002