2017 Winter TCA - PortraitsNavigating the jungles of Pandora will be a cinch after the wilds of Westeros.

Oona Chaplin, who played the tragically-killed Talisa Stark in "Game of Thrones," has signed on to all four sequels to James Cameron's "Avatar."

She'll play Varang, a "strong and vibrant central character." Chaplin is the second high-profile new cast member, joining former "Fear the Walking Dead" star Cliff Curtis.

Chaplin is the granddaughter of legendary screen icon Charlie Chaplin, but has amassed an acting resume of her own. She broke out on "Game of Thrones," but has also appeared in "The Hour," "Sherlock," "Black Mirror," and most recently opposite Tom Hardy in "Taboo."

The plot of the four "Avatar" sequels is being kept under lock and key. We do know that original stars Sam Worthington, Zoe Saldana, and Sigourney Weaver will all return.

"Avatar 2" is slated for release Dec. 18, 2020; "Avatar 3" is scheduled for Dec. 17, 2021; "Avatar 4" in December 2024; and "Avatar 5" in 2025.