Also, you should really watch it!!! It's awesome and hilarious! It's on Netflix if you want to watch it :) they ended the series a while back but came out with a new one called Legend of Korra.
It's the best show ever. I've watched it for almost my whole life and as a kid my sister, family friends and I would have avatar battles where we were different types of benders an we had a "fire nation pod" (water for the fire nation) where you went and someone of your same power had to get you out or the non bender and if all three (or two) of your power got stuck you were out
It's an awesome show, but don't watch the movie with the real people. That shit was fucked up. If you like Twilight, though, I guess you can watch it b/c Jasper is in it as Sokka.
Anyone who has not seen it MUST