Treasure Planet, released in 2002, is the 43rd animated feature in the Walt Disney Animated Classics series. The film is a science fiction adaptation of Robert Louis Stevenson's adventure novel Treasure Island. The film employs a novel technique of hand-drawn 2D traditional animation set atop 3D computer animation. The film was co-written, co-produced and directed by Ron Clements and John Musker, who had pitched the concept for the film at the same time that they pitched The Little Mermaid.