The story follows the young boy Pepero as he searches for his father who has gone missing while seeking the mythical golden city of El Dorado.

Pepero's father had left the village earlier in search of the mythical El Dorado, a city that is said to be built completely out of gold which no one has ever found.

On the way, he picks up more friends like Aztec, a teenager who has to look after his siblings while his mother is sick and who sometimes resorts to stealing to support his family and agrees to tag along in promise of the lost treasures, and Chuchu, who is a small boy performing in a circus and who has to look after his sister.

Pepero also encounters such sinister characters as a swindler who convinces people that he alone can prevent the wrath of a mountain god in return for money from the natives and a girl who tries to kill them off in a maze among others.

This rough map in addition to another they acquire from a jealous princess leads them to the gates of El Dorado where Pepero discovers that his father is being accused of stealing the imperial jewels.

The show holds a great fascination especially for the young viewers since it has all the elements that excite such an audience like lost treasures, clues that have to be solved, maps...etc.