The Mysterious Cities of Gold - Season 1 - Eps 12: Secret of the Medallions
The Spanish army follow Esteban and his friends to the Fort of the Black Eagle. Under cover of darkness, the Spaniards attack the fort, but Tao devises a rocket flare that repels the attackers, saving the fort. The three children leave the fort and at last reach the City of the High Peak, whose chief, Kraka, tells them that the medallions Esteban and Zia wear can open the doors of Sela, one of the Cities of Gold.
About The Mysterious Cities of Gold

Title: The Mysterious Cities of Gold
First Air Date: 1982-06-29
Last Air Date: 2021-01-29
Status: Ended
Rating: 7.7/10 (from 72 votes)
Language: JA
Seasons: 5
Total Episodes: 117
Network: NHK G
Genres: Kids, Animation, Action & Adventure, Sci-Fi & Fantasy
Production Companies: Pierrot, DIC, NHK
Synopsis
The adventures of a young Spanish boy named Esteban who joins a voyage to the New World in search of the lost Cities of Gold and his father.
Cast

Rei Sakuma
Zia (voice)

Masako Nozawa
Esteban (voice)

Isao Sasaki
Mendoza (voice)

Junko Hori
Tao (voice)