(OH-zye).
The second season of this show culminated with the liberation of Ba Sing Se (BAH SING SEH). The predecessor of the title character of this show was Roku (ROH-koo), a friend of the great-grandfather of Princess Azula (ah-ZOO-lah), who is captured near the end of this three-season show. The title character of this show must learn to master four elements and stop Fire Lord Ozai (OH-zye). For 10 points, identify this Nickolodeon cartoon whose first season was adapted into a disastrous 2010 M. Night Shyamalan movie.
The second season of this show culminated with the liberation of Ba
{Avatar}: The Last Airbender [or {Avatar}: The Legend of Aang; prompt on The {Last Airbender};