Avatar: The Last Airbender: Season 3, Episode 8 - ProjectFreeTV

3 - 8: The Puppetmaster

The gang meet a waterbender who lives in the Fire Nation after being captured years ago. Katara becomes her pupil to further develop her waterbending, while Aang, Sokka, and Toph discover she might be connected to a bunch of disappearances. So can this mysterious waterbender be trusted?