In the year 1532, Mendoza, a Spanish Navigator, Estaban, a young orphan, Zia, a young Incan girl, and a band of Spanish sailors set sail from Barcelona in search of El Dorado, the Mysterious City of Gold. Each is on a personal quest of discovery, heritage, and wealth. This is their story... The Mysterious Cities of Gold is a 39-episode animated series that was produced in 1982. It was a French/Japanese co-production that was loosely based on the Scott O'Dell book: The King's Fifth.