Sigourney Weaver has confirmed that she will appear in James Cameron's upcoming Avatar sequels.

Despite her character Dr Grace Augustine dying in the 2010 sci-fi Oscar winner, Weaver has revealed that Cameron plans to feature her in the sequels.

Speaking to Coming Soon, Weaver said: "Don't worry, I will be back.

"Jim [Cameron] says no one ever dies in science fiction.

"He's told me the stories for the next two movies and I have to say that they're absolutely wonderful and there's a real treat in store.

“Now we just have to make them."

The actress also suggested that Avatar 2 will begin filming sometime in 2012 and the actress will next be seen opposite Twilight star Taylor Lautner in the new thriller Abduction, will opens on September 23.