Watch anime online, stream anime episodes online for free.Watch Avatar the last airbender Book 3 Fire Episode 20 English version online and free episodes. Anime Episode guide, Chapter Avatar the last airbender Book 3 Fire Episode 20 Sozin’s Comet Part 3: Into the Inferno Azula’s mental stability, undermined by the betrayal of her friends at the Boiling Rock, begins to deteriorate as her coronation as Fire Lord approaches. Zuko and Katara confront her, but Azula challenges her brother to a Agni Kai. Zuko, although initially winning, is gravely injured when Azula throws lighting at Katara and he dives in the way. Aang duels Ozai without result, still unwilling to kill him. Sokka, Toph, and Suki attempt to halt the Airship fleet but are soon separated, while the Order of the White Lotus battles for Ba Sing Se’s freedom.