Head Writer: Aaron Ehasz
Directed by: Lauren MacMullan
Original Air Date: Friday, December 2nd, 2005
Voices: Zach Tyler Eisen (Aang), Jack DeSena (Sokka), Mae Whitman (Katara), Dante Basco (Prince Zuko), Mako (Iroh), Dee Bradley Baker (Appa/Momo), Johanna Braddy (Princess Yue), Ben Diskin (Hahn), Jason Isaacs (Admiral Zhao), Victor Brandt (Master Pakku), Jon Polito (Chief Arnook)
- Character Debut: Hahn
- New Creature: Turtle-Seal
- This is the first part of the first season finale of Avatar; it was aired along with the following as an hour-long TV movie
- Firebending is enhanced by the sun, while waterbending is enhanced by the moon
- At the time this episode aired, it was the most-watched (along with Part 2) of the series, pulling in about 3 million viewers
- Katara and Zuko duel for the first time
- Iroh is revealed to have had a son who has passed away; he explains that since his son died he thinks of Zuko as his own
- Zhao launches his offensive against the Northern Water Tribe in this episode
While Katara seems to be advancing quite well in her training, Aang still has some work. However, the Northern Water Tribe must brace itself for a huge attack from the Fire Nation. Determined to help, Aang goes to the spirit world to seek help.  
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