Some humans have traveled from Earth to Pandora because it is a source of a very valuable mineral called unobtanium. The largest deposit of the mineral is under a large tree that the local Na'vi people have named "Hometree" ("kelutral" in the Na'vi language). The tree is very important to the Na'vi. Parker Selfridge (played by Giovanni Ribisi) is the military leader of the mining operation. He uses marines for security. The marines need to move the Na'vi people before they can start mining the unobtanium. They have tried to do this many times. They have offered the Na'vi clothing, education, and such, but none has been working. Their next plan is to just blow the place up.