 The picture, Gable's last for Metro-Goldwyn-Mayer, was filmed on location in the Netherlands and England, and was based on the story of turncoat Dutch resistance leader Christiaan Lindemans, also known as "King Kong".The supporting cast features O. E. Hasse, Wilfrid Hyde-White, Ian Carmichael, Niall MacGinnis, and Theodore Bikel.