Avatar: The Last Airbender (Animated)

Nickelodeon's animated masterpiece is the only children's series that belongs on an all-time fantasy TV list. The story of Aang, the last Airbender, follows three seasons of war, loss, redemption, and moral growth with a sophistication that rivals live-action prestige television. The Fire Nation's invasion is a sustained exploration of imperialism; characters change and suffer real consequences. Multiple generations have grown up considering it the greatest story ever told on television.