The Legend of Korra: In Harms Way Season 3, Ep 4
Informed by Mako and Bolin of the imprisoned air benders, Korra and Team Avatar plan to break them out. The budding romance between Jinora and Kai takes another step forward, while Team Zuko is defeated handily by Team Anti-Avatar who break out Sparky Sparky Boom Lady from her frozen prison. Lin Beifong appears in Ba Sing Se to warn Korra of the escape and we learn that Zaheer, leader of Team Anti-Avatar, and his compatriots had attempted to kidnap Korra shortly after she was identified as the Avatar, which resulted in their imprisonment. Also, Bumi needs a badger mole who knows morse code.