Jeffrey Hunter

Character: Captain Bill Ranson

Annemarie Düringer

Character: Rolande Hertog

Nigel Patrick

Character: Major Julien Howard

David Kossoff

Character: Dr. Mulder

Rolf Lefebvre

Character: Hans Faber, chief spy

Larry Burns

Character: Martins, building porter-spy

Anthony Ostrer

Character:

Claude Kingston

Character: Willem Mulder

Robert Raglan

Character: Lt. Miller

Peter Prouse

Character: Sgt. Bill Parrish

Philip Bond

Character: Piet van Wijt

Otto Diamant

Character: Mr. Hendrijk

Marianne Walla

Character: Mrs. Hendrijk

Beth Rogan

Character: Mary Ann Lennig

Arthur Gross

Character: Jan Guldt

Wolf Frees

Character: Brauner, shot spy