This episode is part of the Avatar Book Three - Fire
Avatar The Last Airbender Episode Guide ~ via Wiki
Aang wakes up on board a Fire Nation ship with the gang to discover Bato and Hakoda are all in Fire Nation disguises. Aang finds out what has been occurring and is told to keep his continued existence a secret until the eclipse. Zuko and Azula return home to be greeted by Fire Lord Ozai.