Arms dealer Yolaf Peterson aims to make a sale to guerilla Mongo, but the money is locked in a bank safe, the combination known only to Professor Xantos, a prisoner of the Americans. Yolaf agrees to free Xantos, accompanied by reluctant guerilla Basco, but a former business partner of Yolaf's- John 'The Wooden Hand', has other ideas.

• Tritone Cinematografica
• Atlántida Films
• Franco Nero
• Tomas Milian
• Jack Palance
• Fernando Rey
• Iris Berben
• José Bódalo
• Karin Schubert
• Eduardo Fajardo