10 Actors Who Went To Absurd Lengths For Recent Movies

10. Sigourney Weaver Went Back To High School For Kiri - Avatar: The Way Of Water

The moment it became clear that Sigourney Weaver was set to return in the follow-up to James Cameron's record-breaking Avatar, fans quickly found themselves wondering how in the hell the mind behind Pandora would inject the star back into The Way of Water action; Dr. Grace Augustine did very much bite the dust in that first outing after all.

Yet, as the star herself was told by Cameron over a decade ago, "no one ever dies in science fiction." But rather than simply reviving Grace for this 2022 sequel, the director decided to introduce a new character by the name of Kiri, a 14-year-old who was the daughter of Grace's Na'vi avatar.

Instead of having a youngster do the motion capture and have Weaver just vocally play the part, though, Cameron felt his star was more than up for the challenge of fully diving into the teen role, telling her she had always been "14 at heart."

Determined to give her all to the part of Jake and Neytiri's adopted daughter, Weaver proceeded to very much go back to high school, sitting in on classes so she could figure out the pitch of Kiri's voice.

And not stopping there, the Alien icon also embraced everything from the breath-holding training to learning parkour in order to authentically keep up with her younger co-stars.