Episode Title:
The Chase.
Episode Description:
Aang and his friends are chased by a mysterious machine, which makes it impossible for the group to stop and sleep. The lack of sleep makes everyone irritable, and causes a quarrel between Katara and Toph. Toph blames Appa for the chase and the group realize that she is correct: they are being tracked because Appa is shedding. Aang takes some of Appa's fur to act as a decoy to lure their pursuers away, but he is cornered by Azula. His friends, joined momentarily by Zuko and his uncle, arrive to take Azula down together, but she injures Iroh and utilizes the ensuing chaos to escape.
