The show follows Aang (Zach Tyler Eisen), the last airbender and the “Avatar”, on his journey to bring balance to a war-torn world by mastering all four elements: air, water, earth, and fire.

On his quest, he is joined by companions Katara (Mae Whitman), Sokka (Jack DeSena), and Toph Beifong (Jessie Flower).

In the Fire Nation, Zuko wakes to find someone has left him a scroll telling him he must learn about his great-grandfather's death in order to understand his own destiny.

Iroh gives him a hair ornament that Sozin once gifted Roku, telling him he can redeem the sins of the Fire Nation and bring balance to the world.

Main cast members Zach Tyler Eisen, Mae Whitman, Jack DeSena, Jessie Flower, Dante Basco and Dee Bradley Baker appear as the voices of Aang, Katara, Sokka, Toph Beifong, Zuko, and Appa respectively.

Needing to depict the submerged portion of an iceberg in the actual episode, Konietzko flipped the original image of the visible icy mass upside-down.

On rewatch, it’s hard to tell how much of this was mapped out before the earlier seasons were made, but it seems an essential part of the mythology that Sozin and Roku were lifelong friends before becoming bitter enemies, an important current of subtext running throughout Aang and Zuko’s every encounter.

In addition to top-notch worldbuilding, this episode also featured a smaller, emotional story about how two friends, Roku and Sozin, began a generations-long conflict spanning the entire world.