While teaching Aang firebending, Zuko finds that he has lost all his firebending skills. Now to regain his powers, Zuko and Aang must seek the original source of firebending within the ruins of a lost civilization.

Dave admits that he's getting tired of the beard, then confesses to feeling sick over his new "feud" with Rosie O'Donnell; Dave and Donald Trump talk football; talent coordinator Sarah Billington appears on "Know Your Staff"; Shooter Jennings performs "This Ol' Wheel."