After the events of Harmonic Convergence, Korra has her hands full with trying to remove all the spirit vines that have overgrown Republic City. Her lack of success strains her relationship with President Raiko and brings down her approval rate among the city's populace. When airbenders are suddenly popping up across the world and causing more trouble for the city, President Raiko demands Korra to leave the city, which she takes as an opportunity to travel the world to find the new airbenders. Meanwhile, a dangerous criminal uses his newfound airbending abilities to escape.

Lord Zuko, Tonraq, Desna, and Eska try to prevent Zaheer from freeing the last prisoner, P'Li, while Korra discovers that the Earth Queen is forcing all the airbenders in Ba Sing Se to join her army. Team Avatar thus devises a plan to free them from the monarch's captivity.

Despite Bumi's bad attitude, Tenzin attempts to train the new members of the Air Nation with little success. Things become more complicated for the airbending master as Jinora, with Kai's influence, begins to exert her independence and demand her airbending tattoos. The new airbenders are tested when they are forced to face a group of bison rustlers who have taken Jinora and Kai along with several bison calves.

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

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.

Prince Wu's big day is ruined by Kuvira; Korra thinks she may have found the key to a full recovery.

Korra returns to her role as the Avatar, but is she really ready for action? Bolin and Varrick break from Kuvira's army.

Bolin helps Opal and Lin save the Beifongs from Kuvira. Korra visits the Spirit World looking for help.

The fate of the Earth Kingdom and the Avatar's life is at stake, when Korra comes face to face with Kuvira.