Zuko challenges his sister to an Agni Kai battle for the fate of the Fire Nation and the crown, Zuko immediately outmatches Azula. However, Zuko is seriously injured when Azula tries to kill Katara with a lightning bolt. Katara is forced to fight off a mentally unstable Azula. Meanwhile, Aang is ready to face Ozai for the fate of the world, but Aang can't bring himself to stop the Phoenix King and he is overwhelmed by Ozai's attacks. Sokka, Toph, and Suki try to stop the Fire Nation airships from destroying the Earth Kingdom. The Order of the White Lotus starts liberating Ba Sing Se in hopes of freeing everyone from the Fire Nation.
—dawsonpersi