Old Friends | [s1e20]

: This episode marks the first appearance (outside of brief flashbacks) of Princess Azula, setting her up as the primary antagonist for the next season.

: While his body is held captive by Prince Zuko in a frozen cave, Aang’s spirit seeks help from Koh the Face Stealer, a dangerous spirit who reveals the mortal forms of the Moon and Ocean spirits: Tui and La. [S1E20] Old Friends

: Admiral Zhao reaches the Spirit Oasis and kills Tui, the Moon Spirit, turning the sky blood-red and stripping all waterbenders of their powers. : This episode marks the first appearance (outside