Guest Stars Matthew Yang King voices Appa Ruy Iskandar as Lieutenant Jee Matthew Yang King voices Momo Lim Kay Siu as Gyatso Ryan Mah as Lt. Dang Casey Camp-Horinek as Gran Gran Yvonne Chapman as Kyoshi Tamlyn Tomita as Yukari Maria Zhang as Suki Co Starring Daniel Chai as Vendor Owen Chau as Airbending Instructor Lin Lin as Kyoshi Warrior Kaili Mendoza as Chie Evan Liu as Narin