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SEASON 1 SYNOPSIS

Aang and Appa are awoken a hundred years later by two siblings of the Southern Water Tribe, Katara and Sokka. Aang learns that the Fire Nation started a war a hundred years ago, just after his disappearance. The Fire Nation's opening move in its campaign for global conquest was to launch a genocidal attack on the Air Nomads which drove Aang's entire people to extinction, thus making him "the last Airbender" left alive. He realizes that he must fulfill his destiny of becoming the Avatar and return balance to the world by defeating the Fire Nation. Aang sets out to master the three unlearned elements: Water, Earth, and Fire. With Katara and Sokka, Aang decides to head first to the North Pole to find a Waterbending master.

Aang travels to a Crescent Island in the Fire Nation after contacting Avatar Roku in the spirit world. Upon instruction from Roku, he travels to the Crecent Island to a Fire-Sage temple wherein he contacts Roku on the solstice. Roku tells Aang that he must master all four elements and end the war before this time. Aang is told that Sozin's Comet, which Fire Lord Sozin used as a power supply to start the war, will return in the coming summer, giving the Fire Nation enough power to ultimately accomplish victory.

For most of their journey to the North Pole, the group is pursued by Zuko, a banished Fire Nation prince and son of Fire Lord Ozai who is obsessed with capturing Aang in attempt to restore his lost honor since being banished and burned by his father for speaking out of turn.

CAST

Most of the show's main characters made their debut in the first three episodes. Zach Tyler Eisen and Mae Whitman provided the voices of protagonists Aang and Katara, with Jack DeSena as Sokka's voice. Dante Basco and Mako starred as antagonists Zuko and Iroh, though their role in the show would change near the end of the season. Aang's animal companions, Appa and Momo, were both voiced by Dee Bradley Baker. In the third episode of the season, a new enemy to both Aang and Zuko, Admiral Zhao, was voiced by Jason Isaacs. When the season neared its middle, Aang and his friends make friends with Jet, who was voiced by Crawford Wilson.

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SEASON 2 SYNOPSIS

After leaving the North Pole and mastering Waterbending, Aang travels to the Earth Kingdom to master Earthbending. There, the group meets Toph, a blind Earthbending prodigy who becomes Aang's second teacher. The heroes discover information about an upcoming solar eclipse which would leave the Fire Nation powerless and open to invasion. They struggle to reach the Earth King with this vital information, but are detoured by Appa's kidnapping.

Azula (Zuko's sister), and her two friends Mai and Ty Lee chase the group as they struggle to reach Ba Sing Se. Azula engineers a plan that allows the Fire Nation complete control over Ba Sing Se and the rest of the Earth Kingdom, and destroys any hope of a large-scale invasion of the Fire Nation. Azula is believed to have killed the Avatar, and there is no hope left.

CAST

Most of the main characters who made their debut in the first season remained the same, with Zach Tyler Eisen as Aang, Mae Whitman as Katara, Jack DeSena as Sokka, and Dante Basco as the anti-hero Zuko. However, several new characters appear: Toph voiced by Jessie Flower, Azula voiced by Grey DeLisle and Long Feng voiced by Clancy Brown. Two antagonists, Mai and Ty Lee, are introduced as Azula's minions who are tasked with capturing Aang. They were voiced by Cricket Leigh and Olivia Hack, respectively. Mako, who voiced Iroh, died during production and was replaced by Greg Baldwin.

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SEASON 3 SYNOPSIS

The group recovers from the fall of Ba Sing Se, and travel to the planned invasion site. On the day of the solar eclipse, Aang's group and a smaller band of warriors launch a smaller invasion, which ultimately fails. Zuko confronts his father and defects from the Fire Nation. After a series of events, he manages to gain the trust of the protagonists and becomes Aang's firebending teacher. Aang and Zuko unlock the firebending secrets of the "Sun Warriors", Zuko helps Katara find the man who killed her mother, and Sokka and Zuko travel to a Fire Nation prison to rescue Sokka's father and Suki.

On the day of Sozin's Comet, Fire Lord Ozai harnesses the comet's power to start a genocidal campaign to destroy the rest of the world. Aang and his friends face the self-proclaimed "Phoenix King" Ozai, Azula (now crowned as the new Fire Lord by Ozai), and the Fire Nation army. Aang confronts and defeats Ozai while the Order of the White Lotus takes back Ba Sing Se from the Fire Nation. At the same time, Zuko is incapacitated by Azula, whom Katara then defeats. Zuko becomes the new Fire Lord and promises to help rebuild the world alongside Aang.

CAST

All of the protagonists from season 2 remained the same, with Aang, Katara, Sokka, and Toph voiced by Zach Tyler Eisen, Mae Whitman, Jack DeSena, and Jessie Flower, respectively. After the voice actor Mako died during the production of season two, Iroh was voiced by Greg Baldwin. Zuko, who is voiced by Dante Basco, joins the Avatar during the episode "The Western Air Temple." This leaves Azula, who is voiced by Grey DeLisle, as the primary antagonist. Mark Hamill joins the cast to voice Fire Lord Ozai, who had previously only been shown playing minor roles in the series.

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Aang beats the firelord when learning to go in the Avatar State on Sozin's comet. Aang does not kill the firelord like past reincarnations tell him to, but he instead takes away the fire lords bending. Prince Zuko, Firelord Ozai's son, becomes new firelord while Princess Azula becomes trapped. Avatar and Prince Zuko bring piece to the world. Toph doesn't go to her parents, but instead goes out to her sparring mates. Katara and Sokka go to their dad and finally reunite for a final time. The show ends as Katara and Aang Kiss.