Avatar: The Last Airbender is an adventure tale that follows the quest of waterbender Katara, her brother Sokka, and a boy they find frozen in an iceberg named Aang, who ends up being the avatar, a reincarnated being who can control all four elements whose job it is to keep harmonic balance between the Four Nations. Maybe you were part of the generation that was obsessed with it during its initial run, or maybe you've yet to immerse yourself into this world of elemental nations, but there's never a bad time to watch or rewatch this stunning, Western-meets-anime-style series. This Nickelodeon show has been hailed as one of the best animated series of all time, for good reason.