Michael Dante DiMartino and Bryan Konietzko's Avatar: The Last Airbender broke ground for children's animation in the West. Airing in 2005 on Nickelodeon, Avatar explored fascinating themes of reincarnation, war, oppression, and trauma through nuanced storytelling rich with cultural appreciation. The animated series spanned three seasons (or Books) before building its own universe through printed comics and an animated spin-off series, The Legend of Korra.