Avatar: The Last Airbender

In a lost age, the world is divided into four nations:
the Water Tribes,
the Earth Kingdom,
the Fire Nation and
the Air Nomads.
Within each nation, there is a remarkable order of men and women called the "benders" who learn to harness their inborn talent and manipulate their native element.
Bending is a powerful form combining martial art and elemental magic. In each generation, there is only one "Avatar" who is capable of controlling all four elements. Throughout the ages, the countless incarnations of the Avatar have served to keep the four nations in harmony - that is, until the firebenders attacked!
Just when the world needed the Avatar the most, he mysteriously vanished. A hundred years later, the Fire Nation is near final victory in its ruthless war of world domination.
In the desolated South Pole, a lone Water tribe struggles to survive. It is here that the village's last remaining waterbender Katara and her warrior brother Sokka rescue a strange 12-year-old boy named Aang who has been suspended in hibernation in an iceberg. The Water tribe soon discovers that Aang is not only an Airbender, but also the long lost Avatar. Now Katara and Sokka must safeguard the child Avatar in his journey to master all four elements and save the world from the Fire Nation.