- George Sanders - Warlock
- Raf Vallone - Puppet Maker
- Max von Sydow - Colonel Kosnov
- Orson Welles - Bresnavitch
- Sandor Elès - Lt. Grodin
- Niall MacGinnis - Erector Set
- Anthony Chinn - Kitai
- Guy Deghy - Professor
- John Huston - Admiral
- Fulvia Ketoff - Sonia Potkin
- Vonetta McGee - The Negress
- Marc Lawrence - The Priest
- Cyril Shaps - Police Doctor
- Christopher Sandford - Rudolph
- Hana Maria Pravda - Mrs. Kazar
- George Pravda - Kazar
- Ludmilla Dudarova - Mrs. Potkin
- Dimitri Tamarov - Ilya
- Pehr-Olof Sirén - Receptionist
- Daniel Smid - Waiter
- Victor Beaumont - The Dentist
- Steffen Zacharias - Dittomachine
- Laura Forin - Elena Potkin
- Saara Ranin - Mikail's Mother
- Sacha Carafa - Mrs. Grodin
- Brandon Brady - Clocker Dan (uncredited)
- Larry Cross - Member of Tillnger Foundation (uncredited)
- Rune Sandlund - Mikhail (uncredited)
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Hervé Bromberger
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