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scriptment by James Cameron
Cameron was planning on doing this story of genetically altered life forms immediately after Titanic. He actually had 200 page scriptment written at that point, but it was put aside for a while.

Years later, Cameron’s mysterious Project 880 turned out to be Avatar after all. (This wasn’t surprising, since Lightstorm Entertainment asked us internet folks to stop hosting the Avatar materials online.)

Confused? See the Joblo story here.

Ain’t it Cool has a synopsis of the scriptment here.

There’s a neat run-down of creatures, locations, and crafts at AvatarMovieZone.com