Only problem: She died in the original film.
That's a minor detail for James Cameron, who is once again teaming up with the woman he helped turn into one of the greatest action heroes on screen when he took over "Aliens" in the '80s.
"Sigourney and I have a long creative history, dating back to 1985 when we made 'Aliens,'" Cameron said in a statement. "We're good friends who've always worked well together, so it just feels right that she's coming back for the 'Avatar' sequels."
Cameron also hinted at how Weaver, 64, would be resurrected for the sequels.
"Her character of Grace Augustine, as fans know, died in the first movie, so she's playing a different and in many ways more challenging character in the upcoming films," he said. "We're both looking forward to this new creative challenge, the latest chapter in our long and continuing collaboration."
Weaver is not the only actor returning from the dead. Stephen Lang, who played villainous Col. Miles Quaritch, is also returning to the franchise despite his character's death.
The release of the first follow-up is set for December 2016. The second is scheduled to follow in December 2017, and the third, a year later.