[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.

: Unlike many villains, Zhao is not killed by the heroes but is dragged into the Spirit World by the Ocean Spirit. It is later revealed in The Legend of Korra that he was imprisoned for eternity in the Fog of Lost Souls.

: Consumed by the Avatar State, Aang merges with the Ocean Spirit (forming a giant water creature known as "Koizilla") to obliterate the Fire Nation fleet and end the siege. Key Highlights & Trivia [S1E20] Old Friends

: 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.

The episode is frequently cited as one of the best in the series, receiving perfect scores for its animation and emotional weight. It resolves the immediate threat of Admiral Zhao while establishing a higher-stakes conflict by labeling Zuko and Iroh as traitors to the Fire Nation. : Admiral Zhao reaches the Spirit Oasis and

: Princess Yue, who was saved by the Moon Spirit as a child, sacrifices her life to restore Tui, becoming the new Moon Spirit.

: The finale cements Zuko’s shift from a straightforward villain to a tragic antihero . After failing to capture Aang, he accepts Iroh’s wisdom that "a man needs his rest," signaling a temporary break in his relentless pursuit. Impact on the Series : Consumed by the Avatar State, Aang merges

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