Watch anime online, stream anime episodes online for free.Watch Avatar the last airbender Book 3 Fire Episode 21 English version online and free episodes. Anime Episode guide, Chapter AvataAvatar the last airbender Book 3 Fire Episode 21 Sozin’s Comet Part 4: Avatar Aang Ozai accidentally causes Aang to enter the Avatar State. The Order of the White Lotus successfully liberates Ba Sing Se, while Sokka, Suki and Toph disable all of the Airships. Katara freezes and chains Azula then heals Zuko’s injuries. Aang easily overwhelms Ozai, yet still refuses to kill him. Aang uses his knowledge from the lion-turtle—a new type of bending (described as “Energybending” on the Nickelodeon website)—to strip Ozai of his Firebending, defeating the Fire Lord without taking his life. Newly appointed Fire Lord Zuko declares the war over, and Aang and his friends celebrate together. Aang and Katara kiss before a sunset, thus ending the series.