Aang, Katara, Sokka, and Toph have landed in a clearing where they begin to unpack. Toph comments on their superb campsite finding abilities as she feels the "soft grass." But Sokka corrects her saying that it's not grass but Appa's shed fur. This comment is not received well by Katara who calls it gross.
Katara vocalizes her happiness of having another girl in the group because of the boys immaturity. But, those hopes are shattered as Toph walks up and joins Aang and Sokka in playing in the fur. Aang and Sokka laugh, and Katara has no choice but to giggle too.
Night has fallen and the group sets up camp. Aang pitches a tent, Sokka unravels the sleeping bags, Katara fills a pot with water, and Toph lounges lazily against a rock. Katara comes over and begins to explain the group's normal system of setting up camp: they divide up the work, for example while someone pitches a tent someone else might get food or water.
Toph doesn't take the hint and tells her she has already collected her food and water. Katara gets slightly frustrated and tries re-explaining the system but Toph becomes aggravated and snaps at her. Katara storms off.
Later that night, Aang and Sokka are setting up the last of camp as they de-saddle Appa. Katara comes over to apologize to Toph. Toph again aggravates Katara by turning the apology around on her.
Now even later that night, Toph is silently sleeping in her Earth made tent when she is awakened by a vibration in the earth. She rushes to tell the others. She tries to see if she can identify it, and she says "It feels like an avalanche, but also not like an avalanche." Sokka congratulates her on her "frightening" powers of perception. They decide leaving the campsite is the best choice.
Off in the distance the get a slight glimpse of what's following them: a large, tank-like war machine is moving fast across the desert terrain. After hours of flying, the group's exhaustion is apparent on their faces as they each have dark circles under their eyes.
Finally they settle on a spot. Toph makes her way over to where she plans to sleep but Katara again asks her to help and Toph declines. Katara is again displeased by this and decides enough is enough and confronts Toph about her lack of help to them.
Toph argues back before "slamming the door" in Katara's face as she earthbends a tent and earthbends the door right in front of Katara. Aang decides to play peacemaker and asks them both to calm down. But, Katara's on surface emotions due to lack of sleep cause her to snap at Aang.
Later, Aang and Sokka are seemingly fast asleep as Katara stares angrily at the night sky. She loudly comments on how beautiful the stars are and how Toph won't be able to see them in her tent. In response, Toph earthbends Katara into the air and onto Sokka.
Sokka's on surface emotions also cause him to snap from being woken-up. But there's little time to argue as Toph informs them the machine is back. They again fly away on Appa. While in the air they discuss the machine and how it continuously finds them.
Finally finding a spot that is fairly well hidden and having seemingly lost their pursuers, the group decides to not even set up camp but to sleep. They again debate for a minute on how or what the thing is.
Katara brings up the possibility that it's Zuko, given they haven't seen him since they were up north. Unaware of whom Zuko is Toph inquires about him. Sokka answers that he's "just some anger freak with a ponytail who's tracked us all over the world."
Their debate is cut short as Momo senses the machine's approach, as does Toph. They see the machine moving forward in the distance as it kicks up dirt behind it. Aang believes they should face it and find out who it is.
The tank comes to a halt and the door opens. Three large basilisk lizards emerge from it. The riders and the cause of all the tension in the gang are revealed to be Ty Lee, Mai, and Azula.
Toph believes they can take them as she calculates the odds: three on three. But, Sokka corrects her telling her theirs actually four of them. After a small argument Toph recalculates three on three plus Sokka. Sokka is infuriated but he's no time to argue as Azula's group draws closer.
Toph sends the first strike as she earthbends boulders down at them but the lizards easily climb over them. They decide it's safer if they escape so Aang, Katara, and Sokka head back for Appa. Toph tries to buy them some time by creating a large rock wall separating Azula from them.
It seems to work until Azula sends a bolt of lightning at it blowing a huge hole into the wall. The gang barely escapes as Azula sends one more jet of electricity at them as they fly off. She stares after them, failure is not an option.
Meanwhile Appa too is tired and is drowzily opening and closing his eyes, trying desperately to stay awake. Again they discuss what to do and Katara reveals her fear of Ty Lee taking her bending away again. Then, to Sokka's horror the sun rises over a mountain in the distance signaling they've been up all night. They decide to keep flying for as long as possible, but Aang warns them that they can't keep flying forever.
As the sun rises, Azula's machine is racing to catch up with the gang. But, they're not alone; Zuko follows the machines tracks not far behind. Appa, meanwhile, is having even more difficulty staying awake and finally gives in and falls asleep. This sends Appa and the gang plummeting towards the ground. Aang tries desperately to wake him as they continue to race towards the ground. Finally Appa awakens and stops just above the trees but is unable to keep airborne and they crash land in the woods. Aang states the obvious: "Appa's exhausted."
More high tension causes another fight to break out between Katara and Toph but this time Aang joins in when Toph blames Appa for their predicament: his sheddings are leaving a perfect trail for Azula and her gang. Toph, out of aggravation, decides to leave, while Azula's machine picks up speed upon seeing the fur flying through the air.
Aang is furious with himself for yelling at his Earthbending teacher and Katara too is disgusted with herself because of her actions. Sokka is of little comfort as he agrees that they "were jerks."
They decide to find Toph and apologize but first they need to wash Appa. Now clean and unable to shed more fur, Appa is deemed ready to fly by Aang as long as they leave his saddle and everything else off. Aang decides to give Azula the slip and take what's left of the shedded fur to lead the tank of course. Appa flies off in one direction (hitting trees on take-off) and Aang in another.
Toph has now walked for some time and gained much distance. She stops suddenly upon feeling a vibration. She hits the ground knocking the unknown person off his feet. He is revealed to be Iroh.
Azula, Mai, and Ty Lee have reached the spot of Appa's bath and found the wet fur left in the stream. Ty Lee debates with herself as to whether the "wads" are "bundles" or "bushels" of fur. Mai helps her along dubbing them "clumps." Ty Lee excitedly hugs Mai before she can contradict the action. She pushes Ty Lee off and tells Azula the trail heads off in a direction to the right. But, Azula notices the broken trees from Appa's shaky take-off and is suspicious of Aang's plan to divert them. She tells Mai and Ty Lee to head in the direction of the broken trees and she'll follow the fur trail.
Aang, exhausted and low on momentum, lands in a small abandoned Earth Kingdom town. He slumps on to the end of the town, and he dumps the remains of the fur. He is about to leave but he decides to stay so he sits, waiting for Azula.
Back on Appa, Momo lets out a screech signaling the return of Mai and Ty Lee. Katara desperately tries to get Appa to move faster but to no avail. He shoots like a stone being skipped across the river to where Sokka and Katara believe they're safe. But their hopes are shattered as the basilisks reveal their most astonishing ability: they're able to run on water.
Ty Lee heads for Katara. Once there she begins darting her hands to pressure points but Katara's smarter this time and dodges more easily. After a small battle Katara ends up pinned to a tree by the hem of her sleeves and Sokka's almost completely paralyzed by Ty Lee's strikes. But, Appa proves to be a saving grace as he smacks his tail to the ground shooting Mai and Ty Lee in the river.
Back in the town, Azula has reached the end of the trail where Aang is waiting for her. She dismounts her lizard. Aang, tired and sleep deprived, tries to seek diplomacy and asks who Azula is and what she wants. She's surprised he hasn't guessed yet so she gives him a hint: she covers the left side of her face with her hand and deepens her voice to somewhat match Zuko's and says "I must find the Avatar to restore my honor." Aang doesn't respond.
Toph and Iroh are sharing a cup of tea on a cliff over-looking a farming village. Iroh finds similarities between Toph and his nephew. Toph asks where his nephew is and if he's lost. Iroh responds that he's "a little lost," he tells her his life has recently changed and now he's trying to find who he is. He also advises her not to contradict when people that love you try to help you. Toph takes his words into consideration and heads off to find the gang.
Meanwhile, Azula and Aang stand facing each other in a stand off. She asks Aang if he really wants to fight her, and right on cue Zuko busts through an old building and lands between the two saying: "Yes I really do."
It's a three way stand off as Zuko holds his position between Aang and Azula keeping his battle stance poised at both of them. Azula fires the first shot, hitting Zuko hard and knocking him back.
All three exchange blows until the duel is joined by Katara, Sokka, Iroh, and Toph. The six of them (Katara, Aang, Sokka, Toph, Zuko, Iroh) create a perfect perimeter in front of Azula and back her in a corner. She surrenders, and for one brief second Iroh lets his guard down as he sees Toph with Aang and puts 2 and 2 together.
Azula sees her chance and fires a jet of electricity at him which hits him in the chest and throws him to the ground. Zuko lets out a horrified cry and all four benders unleash their power against her. There is a large explosion but when it clears Azula is gone.
Zuko rushes to his uncle's side. Zuko curses himself, as Iroh lies there not moving, and let's out another angered cry. Toph feels Iroh's vibrations and realizes that he is the man she met earlier in the episode and that Zuko is his nephew. Zuko senses the others behind him and orders them to get away. Katara comes forward and offers to help but Zuko shouts "LEAVE!!" and lets out a violent burst of fire.
Later that night the gang are finally at peace as they lie together, fast asleep.