- Lim Kay Siu - Gyatso
- Casey Camp-Horinek - Gran Gran
- Hiro Kanagawa - Fire Lord Sozin
- Yvonne Chapman - Avatar Kyoshi
- Ruy Iskandar - Lieutenant Jee
- Clyde Kusatsu - Fire Nation Sage
- David Sakurai - Earthbender Spy
- Matthew Yang King - Appa / Momo (voice)
- Leo Chiang - Monk Thet
- Jeff Yung - Monk Tsutop
- Jayden Tianyi Zhang - Myat
- Dorian Giordano - Aydo
- Silver Kim - Pasang
- Simon Leung - Tashi
- Linda Minard - Sister Lio
- Derek Lowe - War Minister
- Summer Testawich - Girl
- Sam Bob - Old Villager
- Haô Ting - Fire Nation Guard
- Oliver Tru Sison - Water Tribe Boy
- Garland Chang - Captain
- Alex Law - Merchant
- Tamlyn Tomita - Yukari
- Maria Zhang - Suki
- Ryan Mah - Lieutenant Dang
- Owen Chau - Airbending Instructor
- Lin Lin - Kyoshi Warrior
- Daniel Chai - Vendor
- Evan Liu - Narin
- Utkarsh Ambudkar - King Bumi
- Danny Pudi - The Mechanist
- Elizabeth Yu - Princess Azula
- Thalia Tran - Mai
- Momona Tamada - Ty Lee
- Lucian-River Mirage Chauhan - Teo
- James Sie - Cabbage Merchant
- Rainbow Dickerson - Kya
- Osric Chau - Tan
- Moheb Jindran - Omashu Guard
- Christopher Logan - Omashu Guard
- Vincent Huang - Pipsqueak
- Tim Zhang - Grocer
- Colin Foo - Pai Sho Vendor
- Paul Kular - Omashu Merchant
- Nipun Joshi - Omashu Townsperson
- Asia Mattu - Omashu Mother
- Dayah Brar - Omashu Daughter
- Albert Nicholas - Guard
- Seth Ranaweera - Omashu Captain
- Emily Schoen - Minstrel
- Shastina Kumar - Minstrel
- Wilson Kwok - Minstrel
- Gayle Yamamoto - Bureaucrat
- Russell Jung - Diplomat
- Sunnie James - Sergeant
- Andy Kalirai - Servant
- George Takei - Koh (voice)
- Randall Duk Kim - Wan Shi Tong (voice)
- Arden Cho - June
- Joel Montgrand - Hakoda
- Ash Lee - Shufen
- Trevor Carroll - Bato
- Olivia Kate Iatridis - Ummi
- Meadow Kingfisher - Young Katara
- Kimmy Choi - Yuyan Archer Captain
- Simon Chin - Yang
- Jerry Yang - Crew Member
- Jayson Li - Angry Man
- Derek Kwan - Patron
- Rohain Arora - Patron
- Winson Won - Muki
- Tom Lim - Yon Rha
- Mela Pietropaolo - Young Girl
- C.S. Lee - Avatar Roku
- François Chau - The Great Sage
- James Rha - Shyu
- Amber Midthunder - Princess Yue
- Amber Midthunder - Princess Yue (voice)
- Kevan Ohtsji - General Li
- A Martinez - Pakku
- Nathaniel Arcand - Chief Arnook
- Irene Bedard - Yagoda
- Joel Oulette - Hahn
- Meegwun Fairbrother - Avatar Kuruk
- Taio Gélinas - Trainee
- Corvin Mack - Waterbender
- Bernie Yao - Head Trainer
- Tyler Peters - Small Boy
- Michael Dante DiMartino
- Bryan Konietzko
- Christine Boylan
- Michael Goi
- Dan Lin
- Roseanne Liang
- Michael V. Nicolo
- Chris Mylordos
- Takeshi Furukawa
Tamlyn Tomita hace el papel de Yukari.
Clyde Kusatsu interpreta a Fire Nation Sage en la serie.
George Takei hace el papel de Koh (voice).
Gordon Cormier hace el papel de Aang.
Kiawentiio interpreta a Katara en la serie.
Ian Ousley interpreta a Sokka en la serie.
Dallas Liu interpreta a Zuko en la serie.
Ken Leung interpreta a Commander Zhao en la serie.
Paul Sun-Hyung Lee interpreta a Uncle Iroh en la serie.
Daniel Dae Kim hace el papel de Fire Lord Ozai.
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