Avatar, The Last Airbender

Have you ever seen this show? It is on Nickelodeon, but don't let that fool you, aside from a few more random episodes, it is mostly a fairly deep show all in all. It really is good. And I don't just mean that it is good for a Nickelodeon show, which I have forgotten a few times myself, but it is food for a show in general. Basic premise? There are the 4 elements of water, earth, fire and air, each one that has benders (waterbender, airbender...) that allow the bender to control the element. So, a waterbender can take some water out of a lake and whip someone with it. An earth bender can make giant rock walls out of the ground. Each element has its own tribe that lived in harmony with the others. Then the Fire Nation wanted to rule the world so they sent armies out to take over. The only person that was supposed to be able to stop the Fire Nation was the Avatar, someone who mastered all 4 elements, and was able to use all of them. The current Avatar is Aang, an airbender who ended up freezing himself in suspended animation for 100 years, while the Fire Nation wiped a lot of people out. Aang was eventually found by Katara, a young waterbender, and Sokka, Katara's older brother. They then set out to help Aang master the elements so that he could defeat the Fire Lord and bring balance to the nations. He is the last airbender because the Air Nomads were wiped out and he is the only one that remains.
Anyway, I highly recommend this show. Don't let the Nickelodeon part scare you away from a really great series. It was 3 seasons (books) long and had 20 episodes (chapters) per season. I recommend watching from the beginning, as it is a whole story from beginning to end, and while there are some stand-alone stories, all in all, you might get confused by the plot which keeps moving along.