After being captured and poisoned by the Red Lotus, Korra must fight to keep herself from being killed in the Avatar State, which would end the entire Avatar Cycle forever.
Team Avatar hatches a plan to save the Airbenders, but all is not what it seems like. Zaheer rediscovers an old Airbender talent. The motive of the Red Lotus is finally revealed.
As Ba Sing Se continues to erupt into chaos, Mako and Bolin struggle to leave the city to deliver Zaheer's message to Korra they were going to attack the Northern Air Temple.
While Korra is struggling with PTSD by the metal poison Zaheer injected in her, she sets off on a journey to try to connect with Raava. Amidst all of this, Tenzin and the others realize that Korra has gone missing after 6 months.