Directed by Eugenio Martin
Produced by Bernard Gordon
Written by Arnaud d'Usseau, Julian Zimet
Cinematography by Alejandro Ulloa
Film Editing by Robert C. Dearberg, Robert Dearborn
Music by John Cacavas
Production Design by Gomez Ramiro
Makeup Supervisor : Julian Ruiz
Special Effects : Pablo Perez
Cast
Christopher Lee (Professor Alexander Saxton)
Peter Cushing (Dr. Wells)
Alberto de Mendoza (Inspector)
Silvia Tortosa (Irina)
Telly Savalas (Captain Kazak)
Julio Pena (Mirov)
Angel del Pozo (Yevtuchenko)
Helga Line (Natasha)
Georges Rigaud (Conde Petrovski)
Alice Reinheart (Srta Jones)
Jose Jaspe (Konev)
Victor Israel (Maletero)
Faith Clift (American passenger)
Juan Olaguivel (Criatura)
Vicente Roca (Jefe Estacion)
Bernabe Barta Barri (First Telegrafista)
Jose Marco Davo (Vorkin)
Jose Canalejas (Guardia Ruso)