03E21 - Sozin's Comet, Part 4: Avatar Aang

Ozai inadvertently unlocks Aang's final chakra, causing him to enter the Avatar state and Aang immediately confronts Ozai with a series of attacks. In Ba Sing Se, the Order of the White Lotus has successfully liberated everyone and in one final act Iroh burns the Fire Nation banner as sign that the Earth Kingdom belongs to the Earth King. Sokka, Toph, and Suki are able to stop the Fire Nation airships. Katara is able to defeat Azula by restraining her and she heals Zuko from his wounds. Aang is still in the Avatar state and he overwhelms Ozai with a barrage of attacks. Aang angrily berates Ozai and his forefathers' warmongering. Aang attempts to put an end to Ozai, but at the last minute, Aang refuses to kill the Phoenix King. Aang uses an ancient art and he strips Ozai of his bending. Zuko is appointed the new Fire Lord and he declares the war is over. Zuko confronts his imprisoned father in order to get information on his mother's whereabouts. Aang and his friends celebrate their victory at the Jasmine Dragon. Aang and Katara share a romantic kiss together.