On the island, Aang seeks guidance from his past lives, but they too insist he must take violent action against the Firelord. The island turns out to be a giant lion-turtle, which gives Aang the guidance he has been seeking. After June is unable to find Aang, Zuko decides to ask June to find his uncle instead. After June leads them to the outer wall of Ba Sing Se, they meet King Bumi, Jeong Jeong, Master Pakku, and Master Piandao, who are members of the Order of the White Lotus. The group soon finds out that Iroh is their leader. After reuniting with Iroh, the team decides to split up and go in different directions to help stop the Fire Nation: Zuko and Katara will handle Azula at the capital of the Fire Nation; Sokka, Suki and Toph will attempt to deflect the Fire Nation airships encroaching on the Earth Kingdom, and Iroh is to lead the Order in the liberation of Ba Sing Se. Sozin's Comet arrives and Phoenix King Ozai prepares to destroy both the Earth Kingdom and the Avatar.
- Ancient Tradition: The Order of the White Lotus.
- Back for the Finale: Iroh, Jeong Jeong, Bumi, Pakku, Piandao, June.
- Bait-and-Switch Comment:Bumi: Wait! Someone's missing from your group. Someone very important. Where's Momo?
- Big Damn Reunion: After encouragement from Katara, Zuko braves himself to meet his uncle again. At first he admits that he's guilty and he doesn't expect his uncle to forgive him, but then Iroh suddenly hugs him and tearfully says that he missed his nephew and he's glad that he finally found his way. Zuko then returns the embrace and goes in tears too.
- Big Good: Iroh fills this role as the Grand Master of the Order of the White Lotus.
- Chekhov's Gun: All the way back in The Winter Solstice: Zuko uses Iroh's sandal to find him.
- Cincinnatus: Once again, Iroh.
- Comet of Doom: Sozin's Comet.
- Easily Forgiven: Iroh forgives Zuko instantly to Zuko's utter shock.
- Freudian Slip: Zuko asking Iroh for help in defeating the "Fatherlord".
- Irony: On the Day of Black Sun, Bumi's off-screen (at the time) moment of awesome taking back Omashu was far more successful than Team Avatar's invasion of the Fire Nation. The irony is, Bumi didn't know before-hand about the solar eclipse, but nonetheless made good use of it when the opportunity fell in his lap. Team Avatar spent months and months planning for the invasion, and it kind of failed (due in part to Azula tipping off Ozai).
- Mass "Oh, Crap!": The Fire Nation soldiers at Omashu during the Day of Black Sun flashback, when they realise that Bumi is free and they're facing him without being able to firebend.
- New Old Flame: Pakku reveals that he's proposed to Kana again, and she accepted this time.
- Never Say "Die": After dancing around it in the last episode and this one, with "take his life" being used instead, it is finally averted, dramatically as hell, when Aang finally says "I have to kill the Fire Lord".
- This happens in universe, as past Avatars all but tell Aang that he must kill Ozai, but it seems none of them will outright tell Aang that.
- Old Master: Everyone in the Order of the White Lotus.
- Ominous Buddhist Chanting: When each of the past Avatars is summoned and while Aang is talking to the lion turtle.
- One-Man Army: It is revealed that Bumi took back his city all by himself, within minutes.
- Only I Can Kill Him: Aang has to be the one to defeat Ozai if they want the war to end peacefully. Justified, as Iroh points out that if he defeated Ozai it might provoke a civil war, but since the Avatar is a neutral party, people would accept it.
- Physical God: The lion turtle isn't God, but it's the largest and wisest being on the planet. It's also the oldest being on the planet, being older than the Avatar Cycle.
- Power Glows: The avatars Aang consults are glowing in the dark.
- Prophecy Twist: Iroh realises that this applies to his old prophetic dream of one day taking the Earth Kingdom capital Ba Sing Se. As a young man, he had believed that he was thus destined to take it as a conqueror for the Fire Nation, but in the Grand Finale reveals that he now realises he was instead supposed to liberate it from the Fire Nation."Destiny is a funny thing, Prince Zuko. It never happens the way you expect."
- The Quiet One: Jeong Jeong takes this role in the White Lotus for the whole finale; his only dialogue is in this episode when he says his own name, as opposed to the other named members who all have prolonged conversations with the Gaang.
- Reality Ensues: Iroh points out he can't be the one to defeat Ozai because doing so would just be seen as one brother usurping power from the other and create more political tension. Aang is the only one who can defeat Ozai without provoking a civil war.
- Red Sky, Take Warning: When the comet skims along the atmosphere.
- She's Not My Girlfriend: Utilized when Zuko leads the Gaang to Jun so they can find Aang.Jun: (noticing Katara standing next to Zuko) I see you worked things out with your girlfriend.(Zuko and Katara blush in shock and become indignant)Zuko: She's not my girlfriend!Katara: (simultaneously): I'm not his girlfriend!
- Shoot the Dog: Avatar Yangchen is a proponent of this and Kyoshi shows shades of it as well.
- Shout-Out: Phoenix King Ozai's saying "It's time for this world to end in fire," sounds very similar to the opening line of the Robert Frost poem "Fire and Ice".
- Surrogate Soliloquy: Aang does this with Momo.Aang: I know you can't really talk. Pretending you can just helps me think.
Momo: *angry chitter*
Aang: I'm going to pretend I didn't pretend to hear that!
- Technical Pacifist: Discussed. Aang insists that Avatar Kyoshi didn't technically kill her enemy Chin (he died because he was too stubborn to get out of the way when she split off her island), but she herself doesn't see that as a valid distinction.
- Thou Shall Not Kill: Aang really doesn't want to kill Ozai. He tries talking to four different Avatars, seeing if they can offer a more peaceful solution. Instead of a third solution, they all tell him to kill Ozai. Yes, even Yangchen, a member of Aang's people, who advises him that he can't be constrained by the morality of an Air Nomad, as the Avatar's duty to the world supersedes his own desires.
- Time Abyss: The lion turtle has lived for long enough to know the era before the Avatar.
- Turtle Island: Aang leaves his friends' camp and wanders to the shore, where he sees an island. When he visits it, true to form, the island isn't there in the morning. The island is a giant lion turtle, that actually turns out to be pretty important to the plot.
- Why Did It Have to Be Snakes?: Though she does hold it in, Toph looks visibly scared while riding the eel hound with Sokka and Suki.