20th Century Fox

Sigourney Weaver Will Return For 'Avatar' Sequels, But As Who?

What's next for Doctor Augustine?

The next three "Avatar" films have added yet another familiar face: Sigourney Weaver.

The Oscar-nominated actress will join fellow "Avatar" alumni Sam Worthington, Zoe Saldana and Stephen Lang in the upcoming all-new trilogy, directed and shot simultaneously by James Cameron — but there's a twist.

"Sigourney and I have a long creative history, dating back to 1985 when we made 'Aliens,'" Cameron said of Weaver's return. "We’re good friends who’ve always worked well together, so it just feels right that she’s coming back for the 'Avatar' 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. We’re both looking forward to this new creative challenge, the latest chapter in our long and continuing collaboration."

Well, that answers the question of how Grace Augustine could possibly return in an "Avatar" sequel: She can't. The good doctor Augustine remains dead as a doornail in the new "Avatar" trilogy, leaving Weaver to play a new character instead.

Which opens up a new kind of question: Who will Weaver play in the "Avatar" sequels? Will she play some form of Augustine-Na'Vi hybrid, with trace memories of the woman she used to be? Will Weaver embody the Tree of Souls, or even the divine Eywa herself?

We'll find out more as the "Avatar" sequels start taking shape. "Avatar 2" is expected to arrive in December 2016.

Who do you think Weaver will play in the new "Avatar" movies?