Along with the four elements, there are four nations that correspond with each element. In the Avatar: The Last Airbender universe, there are people who are able to manipulate, or 'bend', the four elements: Air, Water, Earth, and Fire.There are also sub-elements, such as metal, ice, and lightning. The entire series has been released on DVD in Region One, Region Two and Region Four. The second and third were released with the Complete Second Season Box Set DVD. The first self-parody was released via an online flash game. The first recap summarized the first seventeen episodes while the second summarized season two.

In addition to the three seasons, there were two recap episodes and three 'shorts'. The show's first two seasons each consisted of 20 episodes, while the third season had 21. Each 'Book' takes its name from one of the elements that Aang, the protagonist, must master: Water, Earth, and Fire. The Avatar: The Last Airbender franchise refers to each season as a 'Book', in which each episode is referred to as a 'chapter'. It first aired on February 21, 2005, on Nickelodeon with a one-hour series premiere and concluded its run with a two-hour TV movie on July 19, 2008.

Avatar: The Last Airbender is an American animated television series created by Michael Dante DiMartino and Bryan Konietzko.

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