: The glowing, giant water form of the Ocean Spirit is a visual homage to the Nightwalker from Hayao Miyazaki’s Princess Mononoke.
: Admiral Zhao reaches the Spirit Oasis and kills Tui, the Moon Spirit, turning the sky blood-red and stripping all waterbenders of their powers.
: 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
serves as the explosive finale to Book One of Avatar: The Last Airbender . Directed by Dave Filoni and written by Aaron Ehasz , the episode brings the major themes of sacrifice and balance to a head as the Fire Nation’s massive armada finally breaches the Northern Water Tribe's defenses. Plot Overview
: This episode marks the first appearance (outside of brief flashbacks) of Princess Azula, setting her up as the primary antagonist for the next season. : The glowing, giant water form of the
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.
: 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. Key Highlights & Trivia serves as the explosive
: Princess Yue, who was saved by the Moon Spirit as a child, sacrifices her life to restore Tui, becoming the new Moon Spirit.