While Tao has gone to look for Esteban and Zia, Ambrosius discovers an orichalcum matrix and steals it, which causes a chain reaction: the City of Gold begins to shake, destroying the Great Condor factory, then it begins to close. Ambrosius rejoins the children and they flee, but some orichalcum explodes and he swallows some of it. They manage to get out and run towards the pyramid through which they arrived, while the City of Gold gradually disappears into a sea of molten orichalcum. While climbing the steps, Pichu gets stuck under a pillar and the three children go to his rescue. Ambrosius, in bad shape, continues towards the exit and disappears. The children also go down by the elevators, just as the great pyramid magically disappears. They then find the great yellow dragon who takes them back to the frozen lake before disappearing into the water. As the ice gives way under Tao's feet, Tian Li suddenly reappears with Long Chow to save him, to the surprise of the children who thought he was dead.
Meanwhile, Mendoza, Sancho and Pedro, in possession of the pyramid of Mu, are about to meet a stranger dressed like Zares. But it is actually Athanaos, the traveling prophet and father of Esteban, who miraculously survived the destruction of the first City of Gold. He came out of it contaminated and wears a mask. He was the one who asked Mendoza, in Beijing, to retrieve the pyramid of Mu in order to unlock its secrets and heal himself.
On his side, Ambrosius has escaped and returned to his nave to take a potion to calm his cough, because of the orichalcum he swallowed. While he wants to secure the orichalcum matrix, he realizes that Mendoza has stolen his pyramid and flies into a rage. He then opens a secret trapdoor leading to the nave's basement and puts on a curious metallic armor that gives him superhuman strength. At the helm of his nave, the true identity of Ambrosius is finally revealed: this armor, hidden under a large red cape, allows him to transform into Zares!

Documentary: the armor of Ambrosius, exoskeleton which allows him to transform into powerful Zares.
Kokapetl's Scoop: the mythical cities of Shambhala and Shangri-La, possible locations of the second city of gold.

Characters (in order of appearance): Ambrosius, Tao, Esteban, Zia, Kokapetl, Mendoza, Pedro, Sancho, Tian Li, Long Chow, Athanaos, The High Priest, Zares.

Scenario: Éric Paul Marais
Documentary: Jean-Luc François
Storyboard: Aymeric Gendre with Olivier Nal and Gaston Jaunet
Art director: Fernando Lira
Assistant director: Régis Didry, Fernando Lira