Why, after 13 years, James Cameron wrote the script for "Avatar 2."

Cameron revealed to Variety that a complete screenplay for "Avatar 2" had been prepared.

"Avatar: The Way of Water," but that it had been scrapped. 

"We have to figure out what the hell went down."

Cameron and his group were the ones to present the answer. 

He explained, "All movies work on multiple levels." 

"Avatar" also succeeds on a deeper, subconscious level.