Azula attacks the Western Air Temple, forcing everyone to flee. At the next campground, Zuko asks Sokka about the day his and Katara's mom was killed. He reveals that he knows who killed their mother. He tells Katara, and the two set out to find him. But will Katara be able to keep her cool when she meets him or will she go too far

Sozin's Comet is only three days away. Zuko tells the others what the Fire Lord plans on the day of the comet and the gang realizes that they must stop him before then. But Aang doubts that he can do what is expected of him.