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

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

When Triad activity threatens to put Future Industries out of business, Mako performs an investigation and discovers a much bigger conspiracy.

Korra delves deeper into the Avatar's past and realizes what she must do in order to restore balance between the physical and spirit worlds.

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

Team Avatar arrives in Ba Sing Se. While Korra has an audience with the Earth Queen, the others notice that Kai has gone missing, prompting Mako and Bolin to go look for him. They track him down, but he manages to shake them in the monorail, which takes the brothers to the Lower Ring, where they eventually run into their family from their father's side. Meanwhile, Korra and Asami set course for a small village to collect taxes as a favor to the Queen. After getting her money, the Queen brushes off Korra's request for help in tracking down the airbenders, leaving the Avatar to storm out of the palace. In the city, Kai found himself arrested by the Dai Li and subsequently conscripted in the Earth Queen's first airbending regiment.

Per Su's suggestion, Korra begins to learn metalbending. Opal admits her reluctance to leave Zaofu due to her obligations to her family while Bolin deals with his fear of learning how to bend metal. Meanwhile, Lin faces her past during an acupuncture sessions, forcing her to relive the circumstances which led to her and Su's strained relationship. After a cathartic release of her repressed emotions, Lin makes amends with her sister as well as Opal, who she convinces to travel to the Northern Air Temple to train with Tenzin. Elsewhere, Zaheer and his group determine Korra's whereabouts shortly after escaping Republic City, deducing that she was under the Metal Clan's protection in Zaofu.

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

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

Korra's three-year journey of healing takes her to unexpected places.

Kuvira threatens Zaofu; Bolin is caught in the middle of the bad blood between Su Beifong and Kuvira.

The spirit vines in Republic City start abducting people and it's up to Korra to figure out why.

Team Avatar clashes with Kuvira on the streets of Republic City; Pema and Prince Wu help evacuate innocent citizens.