Avatar is a televsion show that ran from 2005 - 2008. The show begins with a world in disarray due to the fact that one of the four nations,
the Fire Nation, has risen up to opress the other three nations. This is a result of the avatar, a human with the ability to bend all four elements
(earth, fire, water, and air), disapperaing into thin air. Without the avatar there is no one to keep peace and harmony throughtout the world.
That is, until Katara and her brother, Sokka, discover the new avatar, Aang. This leads us to the premise of the show, the training of Aang to
defeat the leader of the fire nation.