Avatar: The Last Airbender Book Three: Fire Now

: Aang must master firebending before Sozin’s Comet arrives, which will grant the Fire Nation enough power to burn the world to the ground.

The season follows Team Avatar as they go undercover within the Fire Nation to prepare for an invasion during a solar eclipse. Avatar: The Last Airbender Book Three: Fire

: After initially returning home as a hero, Zuko realizes his father's cruelty, defects from the Fire Nation, and joins Team Avatar as Aang's firebending teacher. ⚡ Key Character Arcs : Aang must master firebending before Sozin’s Comet