Set two years before the main story from the film, Avatar chronicles the journey of Ryder, a young hopeful (who you can choose) on the planet of Pandora. A hostile place that is teeming with exotic flora and fauna, most of which wants to devour humans outright. The RDA Corporation wants to mine Pandora, because a particular rock gives them a huge payout back home. The native Na'vi doesn't want this to happen. It's a simple story with some nifty twists and turns later on.