On the lush alien world of Pandora live the Na'vi, beings who do not appear to be technologically advanced but are highly evolved. The planet's environment is poisonous, so human-Na'vi hybrids called Avatars must link to human minds to allow for free movement around Pandora. Jake Sully, a paralysed former marine, becomes mobile again through one such Avatar and falls in love with a Na'vi woman. As his bond with her grows, he is drawn into a battle for the survival of her world.