I watched this movie in 3D last weekend. It's about humans invading a planet called Pandora.
The hero Jack Sully is a wheelchair-bound ex-marine who just lost his twin brother. His brother was involved in Avatar project and since they share the same identical genes, Jack was given a chance to replace him in the project. The movie is two hours plus long and if it's a manga I suppose it will belong to Adventure/Mecha catagory. The movie is kind of unreal, In some scenes I can't tell if it's full animation or real humans doing the acting. It's a good entertainment so go on watch it~~