Extra information about AVATAR

First watch the trailer :

Avatar | Official Trailer (HD) | 20th Century FOX

Pandora is the planet where the Na'vis live.

In this population the trees are very important, there is one in which they live, another where they communicate with the spirits.

                                    The plot of Avatar movie

 When his brother is killed in a robbery, paraplegic Marine Jake Sully decides to take his place in a mission on the distant world of Pandora. There he learns of greedy corporate figurehead Parker Selfridge's intentions: Selfridge wants to fight the native humanoid "Na'vi" for the precious material scattered throughout their rich woodland. In exchange for the spinal surgery that will fix his legs, Jake gathers information for the cooperating military unit led by Colonel Quaritch, while simultaneously attempting to infiltrate the Na'vi people with the use of an "avatar" identity. While Jake begins to bond with the native tribe and quickly falls in love with the beautiful alien Neytiri, the restless Colonel moves forward with his ruthless extermination tactics, forcing the soldier to take a stand - and fight back in an epic battle for the fate of Pandora.

                                          The antagonist

The main antagonists in the movie are Col. Quatrich and the RDA. Both have little regard to how the natives feel about them mining for Unobtanium and using machine guns as a show of force.

The main protagonists are Jake Sully, the researchers and the Na'vi.

                                         The protagonist

Jacob "Jake" Sully, born in August the 24th, is the protagonist of Avatar. After his twin brother, Tom was killed on Earth, Jake agreed to replace him in the Avatar program in Pandora, in which humans remotely control human/Na'vi hybrids to safely navigate in the planet. Jake learns the ways of the Na'vi hunters from Neytiri and falls in love with her; he is eventually accepted into the Omticaya clan and becomes Neyiri's mate.