Cameron planning 'Avatar' prequel

The 'Titanic' director James Cameron has revealed he has "an idea for a fourth" movie in the 'Avatar' franchise and revealed that the forthcoming motion picture will tell the story of the "early expeditions" on the moon Pandora.

He told MTV News: "I haven't really put pen to paper on it, but basically it goes back to the early expeditions of Pandora, and kind of what went wrong with the humans and the Na'vi and what that was like to be an explorer and living in that world."