2 — [s1e20] The Siege Of The North Part

In the season 1 finale of Avatar: The Last Airbender , "The Siege of the North, Part 2," the Fire Nation's invasion concludes with Admiral Zhao's assault on the Spirit Oasis. Aang transforms into the massive Koizilla to destroy the fleet, while Princess Yue sacrifices herself to restore the moon and Uncle Iroh confronts Zhao.