Bumping because 4 years after I made this post I still believe that Avatar: The Last Airbender is the best animated series ever put on TV. If you have kids from 4-14... this show will likely speak to them on some level.
I cannot recommend the Netflix live action adaptation. Stay the **** away from the M. Knight SHmamamamalalmaman movie. The cartoon is just *SO* damn good.
----
An aside here, I just found out that the music from the show is going to be played as live music by orchestra on a world wide tour. The music is composed and arranged by the same person who did the music for the original series.
https://www.avatarinconcert.com/