- Writer:
- Victor Canning
- Film Cameraman:
- A.A. Englander
- Film Editor:
- Terry Laurie
- Costumes supervised by:
- Elizabeth Agombar
- Make-up supervised by:
- Tommy Manderson
- Music composed and played by:
- Larry Adler
- Title music in collaboration with:
- BBC Radiophonic Workshop
- Story Editor:
- John Wiles
- Designer:
- Clifford Hatts
- Produced and directed by:
- Rudolph Cartier
- Henkel:
- David Cargill
- General Plaski, Chief of Police:
- Bernard Archard
- Colonel Andrev:
- Laurence Payne
- Police Officer:
- John H. Watson
- King Alexander:
- Joseph Furst
- Veronique Vranja:
- Eva Bartok
- Abbi:
- Sandra Dorne
- Cafe proprietor:
- Declan Mulholland
- Man in cafe:
- Dean Francis
- Colonel Vymer, ret:
- Esmond Knight
- Magda:
- Josephine Crawford
- Father Bernard:
- Edwin Finn
- Tillio Grunditz:
- Derek Francis
- Mayo:
- Andrew Keir
- Prince Rohat, Minister of the Interior:
- Alan Wheatley
- Warder:
- Jerold Wells
- Seaman:
- Dinny Powell
- Skoder:
- Patrick Troughton
- Zativ:
- John Bennett
