When does Avatar: The Last Airbender return?

Avatar: The Last Airbender is set in a largely Asian-inspired world in which some people can manipulate one of the four elements. The only individual who can bend all four elements, the "Avatar", is responsible for maintaining harmony among the world's four nations. The extended Avatar franchise includes an ongoing comics series, a prequel novel series, an animated sequel series, and a live-action film. The complete series was released on Blu-ray in June 2018 in honor of the tenth anniversary of its finale.