It includes a massively star-studded cast who all agree that everything in this epic return to Pandora is bigger.
"You can say it's an action movie, certainly, there's incredible action from the moment 'go,'" says Sigourney Weaver, who plays Kiri.
But in this third trip to Pandora, the river of emotion also runs deep.
'Avatar: Fire and Ash' is an action-packed third return to Pandora
"We deal with a lot of tough things," says Weaver. "We kind of need a movie like this, I think."
The film picks up where "Avatar: The Way of Water" left off. The Sully family is in mourning, grieving the death of a son.
"We really wanted to be genuinely just transparent about that pain," says Zoe Saldaña, who plays Neytiri. "The story is so powerful that it moves me, and I'm in it! But I'm able to separate myself and enjoy the ride."
In a non-stop three hours and 15 minutes, there's war, and a fiery new threat.
Oona Chaplin plays Varang, the leader of the Ash people, who is out for revenge and power.
"I'm still kind of pinching myself," says Chaplin. "This is the most fun I've had in a long time!"
"Jim Cameron has just exploded this imaginary universe that he has created," says Stephen Lang, who returns as Miles Quaritch. "There's no going back. There really only is going forward!"
"Avatar: Way of Water" and "Avatar: Fire and Ash" were filmed at the same time. Production started eight years ago in New Zealand.
"We filmed them concurrently, and so they have the same kind of themes," says Sam Worthington, who plays Jake Sully. "The story just gets a bit bigger."
The young stars of the film are now young adults. Trinity Bliss was seven years old when cameras started rolling. She's now 16.
"I can't believe this has been more than half of my life," Bliss says. "I've known all of these people I love for so long. We've grown up together."
The Avatar universe has also grown with them.
"'Avatar: Fire and Ash' is brilliant," says Bailey Bass, who plays Tsireya. "It's breathtaking. It's immersive, action-packed, ignited, and epic!"
"I would say mysterious as well," says Jack Champion, who plays Spider. "There's a mystery to it and maybe some stuff that might hint to the future."
Three-time Oscar winner James Cameron recalls how he was inspired to create these films, starting with his teenage dreams of bioluminescent forests.
"It gets me out of bed in the morning, doing these films," Cameron laughs.
Fast forward to 2009, when Avatar, the Na'vi people, and the world of Pandora came to life on the big screen.
"To me, it's so fun, it's like Christmas morning every day when I see a new shot come in, and it just looks so real and so cool," says Cameron.
You might say the technology caught up to Cameron's creativity, but he's very clear about one thing.
"People think, 'Oh, well, they just make those Avatar movies with computers, you know?'" he says. "I think that's a very dangerous ground to be on right now, because of AI. We don't use that. We never have."
Cameron says the most important technology is the acting.
"I think that's been a bit overlooked in the storytelling," he says. "It all starts with the people. They're doing some of the best work in their careers, and it's astonishing."
"Avatar: Fire and Ash" is the third film of a projected five.
Cameron says what happens from here depends on the success of this installment.
If it's any indicator, his first two Avatar films are among the highest-grossing movies of all time.
"The way I look at this right now, at this point in my life, and in the Avatar saga, is we've completed a story arc here," he says. "This might be the end of the story, or we might continue, but that I can't say right now."
"Avatar: Fire and Ash" is in theaters nationwide on December 19.
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