Guest Stars Jeff Bennett voices Shiro Shinobi Dee Bradley Baker voices Oogi Aubrey Plaza voices Eska Aaron Himelstein voices Desna Skyler Brigmann voices Kai Bruce Davison voices Lord Zuko Kristy Wu voices P'Li Susan Silo voices Yin Greg Cipes voices Tu Mitchell Whitfield voices Gun Jayne Taini voices Queen Hou-Ting Gary Cole voices Dai Li Sergeant Carlos Alazraqui voices Chow Mitchell Whitfield voices Conductor Gary Cole voices Rich Man Greg Cipes voices Cousin Carlos Alazraqui voices Earth Kingdom Guard Carlos Alazraqui voices Uncle Carlos Alazraqui voices Train Guard Pat Fraley voices Gombo Mitchell Whitfield voices Waiter Jayne Taini voices Aunt