Jake Sully is a US Marine who was paralyzed in action. He goes on mission to a moon called Pandora where blue creatures called the Navi live. Humans can't breathe on Pandora,but their Avatars cam.With his Avatar, Jake can walk again. On Pandora, Jake falls in love with a Navi called Neytiri. He has to make a difficult choice: his love for Neytiri or his loyalty to his country.