Both Aang and Zuko must learn the history of how the war began. Zuko learns a secret about his great-grandfather's past.
Did You Know?
At one point Katara wonders whether they have bathrooms in the spirit world, to which Sokka replies: "As a matter of fact, they do not". This is a reference to episode 7 ("Winter Solstice, Part 1"), in which Sokka spent a day in the spirit world, and when he returned, all he could think of was getting to the bathroom. See more
When Zuko is seen rising from his bed, he is semitransparent. See more
That's amazing! I can't believe you were friends with Monk Gyatso just like I was.
Some friendships are so strong, they can even transcend lifetimes.