Come along on a fantastic journey with the first European to visit China. It is the Thirteenth Century, and Marco Polo (Gary Cooper) has left Venice to open trade with China, the mightiest and richest empire on Earth. Battling raging seas, the sandstorms of the Persian desert and the highest peaks of the Himalayas, Marco reaches the ancient walled city of Peking, and is welcomed by Emperor Kublai Kahn (George Barbier) and his daughter, Princess Kukachin (Sigrid Gurie). The princess falls in love with Marco, despite the fact that she has been promised to the king of Persia, and must marry him by the seventh moon. Less welcoming is the emperor’s scheming minister of state, Ahmed (Basil Rathbone). He sends Marco away on a dangerous mission to the territory of the rebellious warlord Kaidu (Alan Hale) and convinces the emperor to lead his army in an attack on Japan - a battle Ahmed knows they cannot survive.