There are a lot of episodes of Avatar that boys (and girls like me) would like.
Book 1 is the first series. It is about the water benders (like Katara). Water benders are the good guys and they can control water.
Book 2 is the second series and it is about the earth benders. The main earth bender character is Toph, she is a twelve year old, blind girl that can move dirt, rocks and stuff. Some earth benders are good and some are bad.
Book 3 is the third series and it's about the fire benders. These are the bad guys and they (as you can guess) control fire
Have a great day :)