Tập 29: Các nhà thám hiểm phát hiện ra một nền văn minh goblin sử dụng tinh thể, đang tìm kiếm tế bào trẻ trung từ trẻ em.

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The adventurers find The Burning Shield, a mountain that emits a beam of energy and causes Tao's golden jar to glow, and inside they find a race of goblin-like humanoids who harness the power of a giant crystal with advanced technology. Soon the children are commanded to surrender by a voice that identifies itself as the "God of the Olmecs" and knocks them unconscious with blasts of energy. They wake up later in a laboratory surrounded by the creatures and meet their leader Menator, who wants cells from the children to help slow down his people's aging process. Mendoza comes to their rescue and, after fleeing the mountain, they come to a cliff overlooking the valley. There, Mendoza sees all the cities they have been to and realizes that they have been walking in circles, but he believes it means that the Cities of Gold must be nearby. Mini-Documentary: Lake Atitlan, its agricultural value and the mythology attached to it. (Source: Wikipedia)