Season 4

The three young friends Esteban, Zia and Tao traveled the continents aboard the Grand Condor, in search of the lost cities of the Mu civilization. From America to Europe, from Asia to Arabia, they awakened 4 of the 7 cities left by the Mu civilization like so many mysterious messages to future generations. But the key to their quest lies in the last 3 Cities of Gold hidden around the world, while their enemy Zares threatens to take them. From the Arabian desert, they set out in pursuit of Zares to discover and save Mu's last secrets. What they discover, however, astounds them: will they be able to understand Mu's final message and their role in this incredible quest in time? Faced with these challenges, threatened by Zarès and the mysterious plans of Laguerra, Esteban, Zia and Tao will have to make choices and find in their friendship more than in their medallions the answer to their questions.

Esteban, Zia et Tao arrivent en Afrique pour continuer leur quête des Cités d'or en concurrence avec l'équipage de Zarès. Ils cherchent les dernières cités, notamment la cité d'Ophir qu'ils trouvent au niveau des Chutes Victoria, et apprennent le véritable but de leur quête. Durant leur périple, ils visitent l'Éthiopie, le Zimbabwe ainsi que la France et rencontrent François Ier et Nostradamus.