The follow-up to 'The Way of Water' teases a spectacular epic that includes volcano fights, family tragedy and intense action. Fan reactions are over the top: "Yup, another billion to James Cameron."

James Cameron's third Avatar movie is turning the rules upside down, introducing a nefarious Na'vi clan as the human invaders go all-out.

Box-office sensation "Avatar" is back with a third movie this December, teasing epic family drama and stunning new creatures in the first trailer.