Zhao leads the Fire Nation into the North with a bold plan to weaken the Water Tribe. When the battle takes a dark turn, Aang enters a powerful state.

As an attack on the Northern Water Tribe looms, Katara challenges a master Waterbender, Sokka meets a princess, and Aang takes Kuruk’s words to heart.

Madame Gao plays mind games. Ward’s old habits catch up with him, and Danny discovers that he still has much to learn about being the Iron Fist.