A kids' show that handled war, genocide, and redemption better than most prestige dramas manage.
Fun fact: Each bending style is modeled on a distinct real-world martial art, choreographed by a kung fu master.
Sixty years of running down corridors and somehow the budget for the wobbly sets is still part of the charm.
Fun fact: The BBC wiped 97 episodes from the 1960s to reuse the tapes, and some are still missing.