|Aang finally gets pissed off about this whole earth kingdom conspiracy, and stops following their rules so he can go to rescue Appa and see the Earth King. They manage to prove the conspiracy to the Earth king, and he agrees to help fight against the fire nation.|
Then, the Earth king gets tricked into letting Princess Azula's warriors into the city, as they've disguised themselves as Kyoshi warriors and joined forces with the Earth city's conspirators...
Meanwhile Aang goes off to train to open his 7 chakras in order to control his avatar state.. he has trouble opening the crown chakra because he can't let go of his love for Ktarra... Ktarra sees Prince Zukko at the tea shop (by now, he's completely changed and doesn't care about capturing the avatar), and she runs back to inform the Earth king, but gets attacked by the fake Kyoshi.. just when Aang is about to unlock his final chakra, he sees Ktarra in danger and decides to put it off...
Aang, Sakka, and Taf return to the earth city, just as Ktarra and Zukko both get thrown into the catacombs. Zukko's uncle comes to ask for their help.. a funny scene where they find out Taf had already met Zukko's uncle on his own and knew he was friendly, while the others still think he's a bad guy.
When Aang goes to save Ktarra and Zukko, Zukko has second thoughts about siding with Aang.. epic fight scene with Zukko siding with Azula against Ktarra and Aang.. also Aang is amazing at earthbending now.. when Azula's forces start outnumbering them, he realizes he has no choice but to let go of Ktarra to get back his avatar state.. he puts up a diamond shelter around him to meditate.. then just as he unleashes it.. Azula zaps him with lightning.. oshit... Ktarra grabs Aang, and Zukko's uncle comes to back her up so they can escape.
Ktarra was about to use her special healing water to fix Zukko's scar, before he went back to being a jerk. fortunately she still has it so she can save Aang's life. The Azula and Zukko have successfully taken over the earth kingdom... didn't see that coming.