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).

The first part of the episode was directed by Giancarlo Volpe and written by co-creator Michael Dante DiMartino, and follows Aang, Sokka and Hakoda leading an invasion on the Fire Nation, on "The Day of Black Sun" where the firebenders will lose their bending due to a solar eclipse.

The second part was directed by Joaquim Dos Santos and written by head writer Aaron Ehasz, following the beginning of the eclipse, and Zuko standing up to his father Fire Lord Ozai (Mark Hamill).

The day of the invasion arrives, but Aang reveals he cannot enter the Avatar State, as his final chakra was blocked when Azula shot him with lightning.

Shedding their Fire Nation disguises, the fleet sneak into the capital with submarines, but are attacked by enemy troops; Aang kisses Katara and confesses his feelings in case he doesn't survive before flying away.

[c] On Hakoda's orders, Aang flees to the Western Air Temple on Appa with Katara, Sokka, Toph, Haru, Teo, and the Duke while the rest surrender.

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.

[3] Appearing as guests in both parts are André Sogliuzzo as Hakoda, Richard McGonagle as Bato, René Auberjonois as the mechanist, Daniel Samonas as Teo, Wayne Duvall as Warden Poon, Michael Dow as Haru, Kevin Michael Richardson as both Tyro and the Hippo, Carlos Alazraqui as Due and Tho, William H. Bassett as Huu, Sterling Young as Pipsqueak, and Nick Swoboda as The Duke.

[5] Appearing as guests in only the second part are Mark Hamill as Fire Lord Ozai, Grey DeLisle as Azula, and Kristoffer Tabori as a war minister.

"[8] Max Nicholson of IGN gave the episodes ratings of 8.5 and 8.8 out of 10 respectively, writing that Part 1 "delivered a great half-hour of invasion antics, as Team Avatar launched their attack on the Fire Nation.

Not only did this episode feature tons of returning allies, but it also included great moments for them" and that Part 2 "offered a solid conclusion to the "Day of Black Sun" two-parter and set the final events of the series in motion.