- Jeffrey Hunter
- Captain Bill Ranson
- Annemarie Düringer
- Rolande Hertog
- Nigel Patrick
- Major Julien Howard
- David Kossoff
- Dr. Mulder
- Rolf Lefebvre
- Hans Faber, chief spy
- Larry Burns
- Martins, building porter-spy
- Claude Kingston
- Willem Mulder
- Robert Raglan
- Lt. Miller
- Peter Prouse
- Sgt. Bill Parrish
- Philip Bond
- Piet van Wijt
- Otto Diamant
- Mr. Hendrijk
- Marianne Walla
- Mrs. Hendrijk
- Beth Rogan
- Mary Ann Lennig
- Arthur Gross
- Jan Guldt
- Wolf Frees
- Brauner, shot spy
- John Tatham
- Army Captain
