Because the planet's environment is poisonous, human/Na'vi hybrids, called Avatars, must link to human minds to allow for free movement on Pandora. Jake Sully (Sam Worthington), a paralyzed former Marine, becomes mobile again through one such Avatar and falls in love with a Na'vi woman (Zoe Saldana). As a bond with her grows, he is drawn into a battle for the survival of her world.
Their is also The Avatar The Nickelodeon show the show and the Movie has the same name but does not have the same characters. The Nickelodeon Cartoon Avatar is call Avatar The Last Air Bender.
Probably the Movie Avatar is copying The Avatars last air benders idea's. The creator of Avatar The Last Air Bender is Bryan Konietzko and Michael Dante DiMartino.