[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/Tarrlok_backstory_6701.jpg]]
The first episode of the one-hour season finale, first aired along with "Endgame" June 23, 2012.

The new Team Avatar (Korra, Mako, Bolin and Asami) are holed up underground in Republic City, doing recon of Amon's forces and preparing for the arrival of General Iroh, Fire Lord Zuko's grandson at the head of a liberation fleet. Unfortunately, Hiroshi Sato has managed to create biplanes, and the fleet is sunk, although Korra manages to save the general. Iroh pinpoints the Equalists' airfield as their next objective, and leads a commando raid to destroy it. However, Korra insists on staying behind to confront Amon directly, and Mako backs her up.

The two sneak onto Air Temple Island with the intent of ambushing Amon. The place is practically deserted, though, save for the {{depower}}ed Tarrlok in a prison cell. He provides a whole-act flashback after he reveals that he is actually Amon's brother. Tarrlok says that after Yakone was stripped of his bending by Avatar Aang, he had plastic surgery and went to live in the Northern Water Tribe under a new identity. His two sons, Noatak and Tarrlok, were both waterbenders, and Yakone taught them his bloodbending skills, shaping them to seek revenge on the Avatar. As a final test, the brothers have to bloodbend each other. Tarrlok refuses to bloodbend his brother, and Noatak bloodbends his father, then asks Tarrlok to run away with him. Tarrlok refuses and Noatak leaves, and Tarrlok and his parents assumed Noatak died in the storm. Since then, Amon (that is, Noatak) has somehow figured out how to use bloodbending to revoke people's bending ability. Tarrlok says he thinks Amon truly believes that bending is the source of all evil in the world, despite being a bender himself.

Korra and Mako discuss their options. A direct attack is suicidal. Amon, an impossibly powerful bloodbender, would hold all the cards. Instead Korra decides to tries to expose Amon as a bender in front of his Equalist followers, in hopes that the support for him will dissolve on the spot. Korra and Mako sally forth to try this new angle with Tarrlok's blessing.

!!Tropes in this episode include:
* AllThereInTheManual: The fact that Gommu, the hobo, is a telegraph operator comes from the official Nick game ''Welcome to Republic City''.
* TheAtoner: Tarrlok.
* BackForTheFinale: Gommu makes a return, hiding Team Avatar in his underground hobo settlement.
* BuffySpeak: Courtesy of Korra:
--> '''Korra:''' I hate this being patient stuff.
* CallingTheOldManOut: A more horrifying example when Noatak bloodbends Yakone, rubbing in his face that for all he says about power he doesn't have a lot anymore.
* CoolPlane: The Equalist biplanes.
* DressingAsTheEnemy: Korra and Mako dress in chi-blocker garb for reconnaissance.
* {{Flashback}}: In which we find out that Amon/Noatak and Tarrlok are brothers, and that Amon is a [[PeoplePuppets bloodbender]] like his father and brother.
* GoneHorriblyRight: You taught your son well, Yakone... too well.
* HeldGaze: One happens between Korra and Mako that nearly becomes an AlmostKiss, but Korra draws away at the last minute.
* IAteWhat: Asami finds out Gommu's gruel that she was apprehensive about eating was actually culled from the "[[DumpsterDive finest dumpsters]]", so she has a [[GreenAroundTheGills sick-color]] face for a second, spits out the one mouthful she hadn't swallowed yet, and puts it aside. [[TeamPet Pabu]] then [[NauseaFuel laps it up]]. On the other hand, Bolin, as a former StreetUrchin, declares it the [[OverlyNarrowSuperlative finest street gruel he's ever had]].
* IncomingHam: Gommu's cameo... makes an impression.
* KneelBeforeZod: Amon/Noatak forces a pack of wolves to do this in a flashback.
* ManlyTears: Gommu gets these when Team Avatar splits up.
* TheReveal: That Amon is a bloodbender and Tarrlok is his brother. The title "Skeletons In the Closet" is ''very accurate''.
* ReverseTelescopicVision: Bolin holds a telescope backwards before quickly correcting himself.
* ShipTease: Between Mako and Korra again, par for the course for the last few episodes.
* TellMeHowYouFight: Tarrlok identifies Amon as his brother, despite Amon's appearance being totally concealed, by the distinctive feel of his bloodbending.
* UsedToBeASweetKid: Tarrlok, and even Amon before the bloodbending lessons.
* TrainingFromHell: Imposed by Yakone to his sons, to make them master bloodbenders, like he was.
* {{Tykebomb}}: Amon's father Yakone tried to turn him and his brother, Tarrlok, into this in a plot for revenge on Republic City and the Avatar. While he did turn on his father, he ultimately ended up fulfilling what Yakone wanted him to do anyway (to make Republic City suffer).
* WalkDontSwim: Korra uses an air bubble to sneak herself and Mako onto Air Temple Island.
* WhamLine:
-->'''Tarrlok''': I'm Amon's brother.
* WhereDoesHeGetAllThoseWonderfulToys: [[LampshadeHanging Lampshaded.]] Bolin points out how Hiroshi seems to be able to find the time to invent all kinds of new war machines.
* YourCheatingHeart: The drama continues. Subtly resolved with Mako and Asami's short conversation right before the former heads to Air Temple Island with Korra; WordOfGod is that this was their breakup.