Los Angeles - Sigourney Weaver says the scripts for the Avatar sequel are "more amazing" than the first film.
The 67-year-old actress , who plays Dr. Grace Augustine in the sci-fi blockbuster, says director James Cameron has been able to let go and really experiment with the follow-up to the 2009 movie.
In an interview with Variety, she said: "In my opinion, the three scripts I've read so far are many times more amazing than the first one in terms of their scope.
"He did a lot of the heavy leniting in the first movie, establishing the family and the relationships and the world, and now he really gets to play."
Meanwhile, Cameron previously said he isn't fussed when the sequels come out.
He explained: "We haven't moved that target yet, but we will if we need to.
"The important thing for me is not when the first one comes out but the cadence of the release pattern.
"I want them to be released as close together as possible, If It's an annual appointment to show up at Christmas, I want to make sure that we're able to fulfill on that promise."
However, he is to shoot all four sequels together.
He shared: "It's not back-to-back. It's really all one big production. It's more the way you would shoot a miniseries. So we'll be shooting across all (Avatar scripts) simultaneously. So Monday I might be doing a scene from movie four, and Tuesday I'm doing a scene from movie one.
"We're working across, essentially, eight hours of story. It's going to be a big challenge to keep it all fixed in our minds, exactly where we are, across that story arc at any given point. It's going to be probably the most challenging thing I've ever done.
"I'm sure the actors will be challenged by that as well. It's like, 'No, no, no, no, this person hasn't died yet, so you're still in this phase of your life.' It's a saga. It's like doing all three Godfather films at the same time."