Winter Solstice, Part 1: The Spirit World (aired April 8, 2005)* - Title reference: Aang entering in the Spirit World.

Imprisoned (aired March 25, 2005) - Title reference: Katara being imprisoned.

The King of Omashu (aired March 18, 2005) - Title reference: Bumi.

The Warriors of Kyoshi (aired March 4, 2005) - Title reference: The Kyoshi Warriors.

Airbenders revealed to be dead 100 years ago.

The Southern Air Temple (aired February 25, 2005)* - Title reference: The Air Nomad's home prior to the genocide.

The Avatar Returns (aired February 21, 2005)* - Title reference: Aang being the Avatar.

First appearance of Aang, Katara, Sokka, Zuko, Iroh, Appa and Kanna. (Team Avatar: Aang, Katara and Sokka)

Aang is found by Katara after being in a hibernation sphere for a century.

The Boy in The Iceberg (aired February 21, 2005)* - Title reference: Aang.

The following cast to have appeared in two or more episodes of Book 1.

Dee Bradley Baker as Appa (20 episodes) and Momo (episode 3-present, 18 episodes).

Jason Isaacs as Zhao (episode 3-20, 6 episodes, absent in episode 4-7, 9-12, 14, 16-17).

Mako Iwamatsu (credited as Mako) as Iroh (13 episodes, absent in episode 5-6, 10-11, 14 and 16-17).

Dante Basco as Zuko (14 episodes, absent in episode 5, 10-11, 14 and 16-17, has a silent cameo in episode 6).

Debut characters: Aang, Katara, Sokka, Zuko, Haru, Iroh, Roku, Jet, Freedom Fighters, Kanna (Gran Gran), Pakku, Yue, Zhao, June, Suki, Kyoshi Warriors.

Main villain: Zuko (whole season except the finale) and Zhao (episode 18-20).

2.5 Book 5 (graphic novels, 2017-present)Īvatar: The Last Airbender Book 1: Water (2005).

1.4 Book 4 (graphic novels, 2012-present).

Avatar the last airbender book 3 episode 21