Possibly One of the Best Cartoon Series ever, Book One "Water" starts the story and gets you going, the second book "Earth" get you really into it and the last book "Fire" you are really excited to find out what happens next and when its Over .. you feel a VOID and you really miss it. I specially miss the Uncle's voice "Previously in Avatarrrr...." at the start of episodes in Book three The Fire. Its very well balanced series .... recently my kids saw it and absolutely Loved it ... Another series similar to Avatar is Samurai Jack, but it was left hanging and it did not end, I wish its writers and producers finish the story. But this Avatar is amazing