Korra struggles to find a deeper connection with the Spirit World as she and the gang attend a Southern Water Tribe festival.

Korra and Chief Unalaq journey into a dangerous maelstrom and find a source of great spiritual power.

While tensions flare between the Northern and Southern Water Tribes, Korra struggles to remain neutral.

When Korra's parents are wrongfully arrested, Korra fights for their freedom.

Korra seeks Tenzin's help to enter the Spirit World for the first time.

Korra enters the Spirit World and struggles with the Avatar's relationship with the spirits.

Korra and company attempt to close the spirit portals before Harmonic Convergence.

Korra discovers a new twist in Unalaq's evil plan. Meanwhile, Tenzin realizes he must face his own demons in order to save his daughter.

Korra discovers a way she may be able to defeat the ultimate dark spirit and save the world.

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.

Tenzin, Jinora, and Team Avatar travel toward Ba Sing Se in order to find the new airbenders. Stopping at various villages along the way, they hope to recruit them in order to rebuild the Air Nation, though with little success as they were only able to convince a young boy named Kai to join them. Meanwhile, Zaheer travels the four nations to free his fellow criminals from their prison. After freeing Ghazan and Ming-Hua, they set course for the Northern Water Tribe to free their last member, P'Li. Upon learning of their escape, Lord Zuko sets course for the Northern Water Tribe himself in an attempt to stop them.

Korra's quest leads her and her friends to the metal city of Zaofu.

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.

Mako and Bolin deliver an ominous message from Zaheer.