->''"Bumi, you're a mad genius."''

The next stop on the group's trip around the world is the Earth Kingdom city of Omashu. There, Aang shows Katara and Sokka the Omashu chute mail delivery system, which he and his friend Bumi (a Hindi word meaning 'Earth') used to ride for fun a hundred years ago. The trio gives the chutes a try but runs into trouble after it destroys a cabbage merchant's cart. Put in front of the crazy King of the city, the gang is unexpectedly given a feast. The King suspects that Aang is the Avatar and puts him through three deadly challenges to test his skills. After the last challenge, Aang is forced to figure out the King's name, and based on the nature of the challenges, he realizes that the King is his old friend Bumi. Bumi informs Aang of what his task as the current Avatar entails.

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!!Tropes:

* AbsenteeActor: This is the first episode where Zuko and Iroh do not appear.
* AerithAndBob: Aang's and Katara's aliases: The Honorable Bonzu Pipinpadalopsicopolis III and his granddaughter, June.
* ActuallyPrettyFunny: Sokka thinks this of the king's "jokes." Aang and Katara aren't amused because the jokes are pretty terrible.
* AirVentPassageway: ZigZagged. Aang suggests escaping through the air vents, but [[SubvertedTrope Sokka notes that they couldn't fit]]. Aang says that even though they can't fit, [[DoubleSubversion Momo can]]. However, Momo just [[ZigZaggingTrope gets stuck halfway through the air vent hole]].
* ArsonMurderAndJaywalking: The Gaang are hauled up in front of the King for "vandalism, traveling under false pretenses and malicious destruction of cabbages."
* BadassBoast: Bumi when he [[CrouchingMoronHiddenBadass reveals himself]]:
-->'''Bumi:''' You thought I was a frail old man, but I'm the most powerful earthbender you'll ever see.
* ChirpingCrickets: Some guy coughing.
* ClarkKentOutfit: The King's elaborate, oversized robes, which hide how ridiculously muscular he is.
* CoverBlowingSuperpower: King Bumi utilizes this by throwing an object at Aang and forcing him to catch it with his airbending, revealing he is the last airbender and the Avatar.
* CrashingThroughTheHarem: During their sleigh ride, they pass through an living room.
* CrouchingMoronHiddenBadass: Bumi looks like a venerable eccentric, which he is -- but he is ''also'' a fearsome earthbender.
* DishingOutDirt: Hey, King Bumi's an Earthbender, it's his thing.
* DisproportionateRetribution: The merchant wants the crew executed for destroying his cabbage cart.
* FailedAttemptAtDrama: Averted mostly by Bumi most of the time, despite his goofiness. But when he orders the trio to be thrown in jail he tries to make it a dramatic announcement and it falls flat. For the audience this shows we're not meant to be too worried about their fate.
* FluffyTamer: King Bumi and his legendary monster Flopsy.
* FluffyTheTerrible: "Flopsy" turns out to be the hulking gorilla-goat, not the little cute pet rabbit. Though it winds up being just as docile as you'd expect something named "Flopsy" to be.
* FruitCart: The Cabbage Merchant and his cabbages. Becomes a RunningGag here and in later episodes.
* GilliganCut: Katara tells Aang he'll need some kind of disguise before they enter the city, and Aang sarcastically suggests that he could grow a mustache. Cut to Aang with a fake mustache and hair made of straw and Appa's fur.
* HeyWait: Aang, Katara and Sokka talk their way past the guards at the city gate, with Aang pretending to be their elderly grandfather. Just as they're being let through, one of the guards notices something and calls them back...but it turns out it was to berate Sokka (who the guard notes seems very strong and muscular) for apparently not showing respect to the elderly by not carrying his grandfather's pack for him--Aang immediately tossed the bag he was carrying to Sokka.
* HiddenPurposeTest: The King was Bumi, and the tasks were partly a test to see if Aang could think creatively.
* InstantlyProvenWrong: Aang's statement "The people here are the friendliest in the world." is immediately challenged by the guards mistreating the cabbage vendor.
* ItAmusedMe: When Sokka and Katara question Bumi on why he didn't just tell Aang who he was instead of making him do the three challenges, Bumi admits that he finds it fun to mess with people. The other reason was to get Aang to think creatively, which will help him when he faces off against the Fire Lord.
* KickTheDog: Okay, so those cabbages couldn't come into the city, but did the guards need to catapult them into a ravine?
* LetsGetDangerous: Aang eventually rises to all Bumi's challenges. Including starting a mini-cyclone to send Bumi's giant rock back at him.
* LuxuryPrisonSuite: The heroes' prison cell was newly refurbished and looked like a nice hotel room.
* MadEye: Bumi.
* NoDoubtTheYearsHaveChangedMe: A hundred years have naturally changed Bumi's appearance, and though the clues are there (his MismatchedEyes, squint and missing tooth), it's his personality that Aang recognises him by.
* NoMrBondIExpectYouToDine: When the protagonists are arrested, the king proclaims their sentence: "THROW THEM...a feast!"
* NotSoInnocentWhistle: Aang does it when the king eyes our destructive heroes for passing judgment on them.
* OffWithHisHead: The cabbage merchant suggests this punishment.
-->'''Cabbage Merchant:''' Off with their heads! One for each head of cabbage!
* OhCrap: Aang, when he finds out that King Bumi isn't some weak and wimpy-looking old man, but is in fact "the most powerful earthbender [you] will ever see."
* OhCrapSmile: Aang, when turning around to see the real Flopsy.
* OverlyLongName: Aang initially identifies himself as "Bonzu Pipinpadaloxicopolis III," with Katara introducing herself as "June Pipinpadaloxicopolis."
* {{Pun}}: Quite a few, thanks to King Bumi.
* RecurringExtra: The poor cabbage merchant's first appearance.
* ReversePsychology: In a way--the king's first two tests were to see whether or not Aang can creatively work out of tough situations, but the third test ''punished'' Aang for creatively using the King's ExactWords for an [[TheWindowOrTheStairs easier solution]].
* RunningGag: A quiet cough heard after a bad pun.
* ThirdTimesTheCharm: Aang is able to fetch the key from the waterfall on his third attempt.
* UnpronounceableAlias: See OverlyLongName above. Though Katara and Bumi can keep up with it just fine.
* WhamLine: When Aang chooses the King as his opponent. Doubles as a PreAsskickingOneLiner.
-->'''[[CrouchingMoronHiddenBadass King]]:''' Wrong choice.
* TheWindowOrTheStairs: The titular King is putting Aang through a series of tests. For the last one, he tells Aang to choose a warrior to fight. Aang tries to TakeAThirdOption and choose the old, crazy King himself - but he was expecting this, informing Aang that he's an incredibly powerful earthbender and tougher opponent than any of the warriors presented. In fact, he's the strongest in the entire series until Toph comes along, and even then it's debatable.
-->'''His Majesty:''' Heh heh, ''wrong'' choice!