The day of the eclipse has arrived, and the invasion force gathers together to make last preparations. They infiltrate the island and the battle begins. Meanwhile, Aang searches for the Firelord.

As the invasion force fights their way to the Fire Nation capital, the kids help Aang to find the Fire Lord in time for the eclipse. But there are a few surprises. Zuko confronts his father and tells him that he's going to join the Avatar.