The Guru: Even metal is just a part of Earth that has been purified and refined.
Book 2 Episode 18 - The Guru / Crossroads of Destiny
As requested by scoodoolybebop
Posters from the signing today! And look, older GAang!
Avatar the Last Airbender (Momo, Aang, Sokka, Appa, Iroh, Katara, Toph & Zuko).