“Avatar: The Way of Water” launches the story of the Sully family (Jake, Neytiri, and their kids), the trouble that follows them, the lengths they go to keep each other safe, the battles they fight to stay alive, and the tragedies they endure. All of this against the breathtaking backdrop of Pandora, where audiences are introduced to new Na’vi cultures and a range of exotic sea creatures that populate the majestic oceans.