Starting with, the story begins with the fact that the human race will soon be hit with a worldwide energy shortage. After depleting Earth's natural resources, the Resources Development Administration (RDA) looks to Pandora, a jungle planet orbiting a gas giant in the distant Alpha Centauri galaxy, to provide a solution in the form of 'unobtanium', an energy-rich element,  a valuable mineral that costs twenty million per kilogram on earth. The year 2154 is depicted in "Avatar." Avatars are hybrid clones that are half-human and half-Na'vi and have been successfully created by human scientists. The intellects of human operators are "uploaded" into the substitute bodies.

Jake Sully, who used to be a great Marine but now has to use a wheelchair, gets a second chance at life when he replaces his identical twin brother as an avatar operator. He is sent to Pandora to protect the Avatar program's leader, Dr. Grace Augustine, and xenobiologist Dr. Norm Spellman as they investigate the planet's native flora and fauna. He soon meets Neytiri, a Na'vi woman, and eventually embraces their culture after learning about the planet and the Na'vi's spiritual bond to all forms of life.

The real reason humans are on Pandora is to mine a mineral called unobtainium, which sells for millions on Earth, as RDA administrator Parker Selfridge explains. Jake is offered a deal by Colonel Miles Quaritch, who promises to provide him with prosthetic limbs if he helps him learn the truth about the Na'vi. Although Jake is a human who is merely living indirectly through his Na'vi avatar, he and Neytiri fall in love and decide to spend the rest of their lives together. However, this is complicated by the fact that Jake is technically a spy for the RDA.

Jake, with the help of the new tribal chieftain Tsu'tey, rallies the scattered tribes into an effective fighting force against the RDA. The Na'vi are no match for the RDA's advanced technology and weapons, but when the animals of Pandora join the fray, the tide of the battle is turned. Except for Jake and a small number of others, all humans are ordered to leave Pandora and return to Earth. When Colonel Quaritch of the RDA cuts the avatar link unit containing Jake's human body, Jake's consciousness is transferred into his avatar for good. Jake becomes their leader. And it is the end of the movie, but 'The Way Of Water' has some real serious battle.