Guest Stars Matthew Yang King voices Appa Ruy Iskandar as Lieutenant Jee Lim Kay Siu as Gyatso Casey Camp-Horinek as Gran Gran Yvonne Chapman as Kyoshi Clyde Kusatsu as Kaja Hiro Kanagawa as Fire Lord Sozin David Sakurai as Earthbender Co Starring Leo Chiang as Monk Thet Derek Lowe as War Minister Linda Minard as Sister Lio Simon Leung as Tashi Jeff Yung as Monk Tsutop Silver Kim as Pasang Garland Chang as Captain Sam Bob as Old Villager Alex Law as Merchant Dorian Giordano as Aydo Summer Testawich as Girl Jayden Zhang as Myat Haô Ting as Fire Nation Guard Oliver Tru Sison as Water Tribe Boy