- Ernest Borgnine
- Boris Mitrov
- Kerwin Mathews
- Bob Avery
- Colleen Dewhurst
- Helen Benson
- Alexander Scourby
- Colonel Vadja Kubelov
- Glenn Corbett
- Frank Sanford
- Vladimir Sokoloff
- Papa of Boris Mitrov
- Hanna Landy
- Bess Harris
- Friedrich Joloff
- General Nikolai Chapayev
- Richard Kendrick
- Inspector Jenkins
- Ed Prentiss
- Adrian Benson
- Holger Hagen
- Hans Grünwald
- Bob Iller
- Hartmann
- Reinhold Pasch
- Otto Bergman
- Carl Jaffe
- People's Judge
- Eva Pflug
- Tanja Rosnova
- Michael Mellinger
- Detective
- Clete Roberts
- Narrator
- Jimmy Bates
- Russian Student Spy
- Al Beaudine
- Agent
- George Blagoi
- Commuter at Terminal
- Eumenio Blanco
- Servant
- Tex Brodus
- Agent
- Brad Brown
- Student
- Ramond Burgin
- August
- James T. Callahan
- C.B.I. Agent
- Seymour Cassel
- Hotel Pageboy
- Dick Cherney
- Agent
- Jack Deery
- Mr. Foy
- George Ford
- Agent
- Raoul Freeman
- Party Guest
- Lisa Golm
- Helga
- James Gonzalez
- Victor Darvas
- Winfried Groth
- Police Captain
- Mary Ann Holloway
- Elegant Lady
- Ted Knight
- Professor Vasheen
- Susanne Körber-Harlan
- Waitress
- Philo McCullough
- Airplane Passenger
- Eve McVeagh
- Madame Pusawa
- Ray Pourchot
- Agent
- Paul Power
- Party Guest
- Charles H. Radilak
- Sven
- Leoda Richards
- Party Guest
- Henry Rowland
- German Radio Dispatcher
- Rube Schaffer
- Messenger
- Abigail Shelton
- Olga
- Glenn Stensel
- Minor Role
- Robert Stevenson
- C.B.I. Supervisor
- Egon Strohm
- Concierge
- Harro ten Brook
- Reiner
- Gerd Vespermann
- Oswald
- Anatol Winogradoff
- Uncle Jack
