Sozin's Comet.

About Sozin's Comet

"Sozin's Comet" is the four-part series finale of the American animated fantasy action Nickelodeon television series Avatar: The Last Airbender, created by Michael Dante DiMartino and Bryan Konietzko. It was written by the creators alongside Aaron Ehasz, and directed by Ethan Spaulding, Giancarlo Volpe, and Joaquim Dos Santos. Although the finale is split into four episodes, it aired as a two-hour four-part film on July 19, 2008. The Saturday airing of "Sozin's Comet" acted as a climax to a week of ten new episodes that concluded Avatar's third season. Before the week of July 14–19, no episodes had been shown in the US since November 30, 2007, though some episodes had been released on DVD prior to their airdate. This is also considered a 92-minute television movie.