I'm with Sole on this one. While Avatar technically isn't anime, it is chock full of eastern influence. The character development is remarkable, the continuity is so complete it is noteworthy (nothing that ever happens in the series is forgotten by the plot by the end), the action is exciting, and it is shockingly deep. While it may be a Nickelodeon show, I think there is a lot there for older crowds. Maybe even moreso than for the younger audience, as they won't understand most of it.