Idont know if you guys know this but okay major spoilers ahead
Don't look if you dont wanna know
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PLEASE DON"T READ IF YOU DON"T WANNA KNOW
*The guru______________________________________
Aang's mission: meets with the guru, they are friendly for a minute, get serious about what they are doing, then begin whatever training. Incidently, the scene changes and we don't actually get to see the training....
Katara/Zuko: Zuko sees and stops her in the street. When she sees who it is she tries to run, but is captured by the Dai Li to get her out of the way for when the Dai Li try to take control of the King again. Zuko tries to help and is captured too. They are thrown into the cave to get them out of the way. The preview scene happens and she heals his scar with the special water. But they are still stuck there.
Sokka's mission: After they see the guru (this is right at the end of the episode) he stops by to see dad for a while. Dad is like "wow Sokka, I am really proud of you," they wander around for about 30 seconds bonding time before Sokka sees an injured Suki being healed. She explains what happened and that Azula is in Ba Sing Se posing as them. Sokka sits back and goes, "Oh no."
Then it goes to BSS where the palace is burning. Azula walks into the throne room and says, "King [__], my father Ozai sends his regards from the Fire Nation." End of Guru.
*Crossroads of Destiny____________________________
Sokka and Aang freak and speed back to BSS as quick as possible. But are far away, so it will be a while before they can get there.
Iroh gets anxious when Zuko doesn't come back, so he goes looking for him. He finds Toph and breaks her out after a huge battle with 2 earth masters.
Azula is in the throne room about to take the King, along with all of Ba Sing Se, captive when the Dai Li walks in and they begin to battle. The Dai Li gains enough ground to get them out of the room and the King's like "you were right! It was a plot!" Long Feng says he will personally take care of the invader problem & runs out.
Zuko is explaining why he was banished to Katara (what else do you do when you get locked up? you ask "what are you in for?") & just after he finishes, the wall comes down and Toph & Iroh are standing there. Toph makes some funny quote and they escape.
The Dai Li is working on the 2 girls, while only Long Feng is strong enough to fight Azula. They start talking as they fight, and Azula (being the evil devil that she is) makes him an offer to truly control BSS with Ozai's backing. He stops fighting and agrees, but doesn't see the King watching the whole conversation from the door. They both turn and see him standing there and move to attack......
Only to have Iroh, Katara, Toph, Zuko bust in from one door, while Aang and Sokka bust in from the other. Iroh and Toph start taking the Dai Li, Sokka takes Mai, Katara takes Ty Lee (with how much Katara hates how she blocks chee {bending energy} did you expect them not to have the final fight against each other?), Aang takes Long Feng, and Zuko takes Azula (oh yeah!).
Iroh and Toph kick everyone's butt. The End.
Sokka and Mai are somewhat matched since neither bends, but he wins by knockout with the boomerang when it comes back to hit her on the head, like he did to Zuko. Only Zuko had a helmet. .
Katara pulls some trick and traps Ty Lee and probably makes some gloating comment about it.
Zuko and Aang are taking longer. Azula and LF are mocking each of them and are about evenly matched. Then they both loose patience and use their biggest attacks. Azula throws lightning at Zuko while LF... I guess he throws a really big rock really fast. Azula is standing behind Aang and Aang dodges it. Zuko redirects the lightning and hits Long Feng. End of fight.
They each become heroes of the Earth King & have a big party. Zuko & Aang have a conversation & strike up a friendship. End of Crossroads