The Deserter (aired October 21, 2005) - Title reference: Jeong Jeong.
Bato of the Water Tribe (aired October 7, 2005)* - Title reference: Hakoda's best friend and former personnel of the Southern Water Tribe.
The Fortuneteller (aired September 23, 2005) - Title reference: Aunt Wu.
The Blue Spirit (aired June 17, 2005)* - Title reference: Zuko's antihero alter-ego.
Azula and Ozai first appear as a flashback.
The Storm (aired June 3, 2005)* - Title reference: The weather during the episode, while also referring to Aang's nightmare of being trapped in a storm.
The trio tries to stop two clans from feuding again.
The Great Divide (aired May 20, 2005) - Title reference: The two clans: One representing Jin Wei and another representing Wei Jin.
Jet and the Freedom Fighters (Smellerbee, The Duke, Sneers, Pipsqueak and Longshot) first appear.
Jet (aired May 6, 2005) - Title reference: The leader of the Freedom Fighters, Jet.
The Waterbending Scroll (aired April 29, 2005)* - Title reference: Katara finding a waterbending scroll to properly learn the techniques.
Winter Solstice, Part 2: Avatar Roku (aired April 15, 2005)* - Title reference: Aang meeting his past life.
Aang goes to the Spirit World for the first time.
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).