Avatar (2009 film) habitable moon orbiting the gas giant Polyphemus in the Alpha Centauri star system. Pandora, whose atmosphere is poisonous to humans, is inhabited by the Na'vi, a species of , blue-skinned, sapient humanoids that live in harmony with nature and worship a mother goddess named Eywa. To explore Pandora's biosphere, scientists use Na'vi-human hybrids called "avatars", operated by genetically matched humans; Jake Sully, a paraplegic former Marine, replaces his deceased identical twin brother as an operator of one. Dr. Grace Augustine, head of the Avatar Program, considers Sully an inadequate replacement but accepts his assignment as a bodyguard. While protecting the
Avatar: The Last Airbender among the four nations, and act as a mediator between humans and spirits. When the Avatar dies, their spirit is reincarnated into the next of the four nations in what is known as the Avatar cycle: the Fire Nation, Air Nomads, Water Tribe and Earth Kingdom. An Avatar is required to master each bending art, beginning with the element of their home nation, and proceeding to learn the others in the order of the Avatar cycle, starting at the age of sixteen. Avatars also possess the ability to enter a condition known as the Avatar State, in which they gain