Avatar: The Last Airbender Season 3 Episode 13 : The Firebending Masters
Zuko prepares to teach Aang Firebending, but for unknown reasons can't Firebend. He and Aang travel to the temples of the extinct Sun Warriors to learn about the ancient origin of Firebending. Zuko reveals to Aang that his grandfather caused the extinction of the dragons, the original Firebenders. After discovering the Sun Warrior culture still exists, Zuko and Aang are sent to see the Firebending Masters, later revealed to be the two last surviving dragons in the world. After teaching them the true nature of fire, namely as the gift of life, Zuko's powers are restored and Aang no longer fears Firebending. The culture of the Sun Warriors is a mix of Aztec, Thai, and Polynesian as shown by their dress, the Dragon Dance, their music, their respect for dragons, and their architecture.