Avatar: The Last Airbender Season 2 Episode 16 : Appa's Lost Days

After being abducted, Appa is traded to the Fire Nation Circus where the Circus Trainer mistreats him, though the Sky Bison soon escapes with the help of a small boy. He later unwillingly enters a fight with a Boarcupine, and though wins, is badly wounded. By fortune, Suki and the Kyoshi warriors come across Appa and help him recover from his injuries, but are later attacked by Azula and her team and Appa is forced to flee. He returns to his chil...