Avatar : the last Airbender. The search. Part one (Avatar the last airbender (Television program))
Summary
"For years, fans of Avatar: the Last Airbender and The Legend of Korra have burned with one question -- what happened to Fire Lord Zuko's mother? Finding a clue at last, Zuko enlists the aid of Team Avatar -- and the most unlikely ally of all -- to help uncover the biggest secret of his life."--Back... Full description