After the events of Harmonic Convergence, Avatar Korra discovers that her decision to leave the spirit portals open has unexpected consequences. Wild spirit vines have overgrown Republic City and Airbenders are suddenly popping up across the four nations.

Korra, Tenzin and Team Avatar search for new Airbenders in an effort to rebuild the Air Nation. Meanwhile, a band of sinister criminals are organizing to hunt down the Avatar themselves.

Team Avatar travels to Ba Sing Se to search for Airbenders.

Korra finds out that the Earth Queen imprisoned airbenders to create an army. Jinora leads an investigation with her spiritual projection. Lin joins the Avatar Team.

Korra, Mako, Bolin and Asami visit Sao Fu, the city of Metal Clan. Lin does not want to meet her past. Su Jin tells her life story. Air Temple Island training camp has a new recruit.

Korra practices metal bending. Lin takes an acupuncture session. Zaheer, Ghazan, Ming-Hua and P'Li escape Republic City.

Though contending with Bumi's bad attitude, Tenzin tries to train the new members of the Air Nation.

Zaheer and his friends attempt to kidnap Korra.

Korra learns the truth about the group that is planning to destroy her.

Korra and Asami are stranded in the desert. The members of The Red Lotus negotiate with the Earth Queen.

Mako and Bolin deliver an ominous message from Zaheer.

When other plans fail, Korra suggests a brave idea to take on the Red Lotus and save the Air Nation.

Korra battles Zaheer, while Bolin and Mako duel Ghazan and Ming-Hua. The captive members of the Air Nation escape and band together to help Korra.