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The "Private Practice" star joins the cast of a new supernatural thriller.

"Private Practice" doc KATE WALSH will move from saving lives in the clinic to saving the world when she joins DENNIS QUAID and PAUL BETTANY in the supernatural thriller 'Legion,' according to Daily Variety.

The film, shooting in New Mexico, follows a group of strangers who must unite to protect a baby who could be the key to preventing an apocalypse -- and may just be the second coming of Christ.

Bettany plays the archangel Michael, who stands between God, mankind and the end of the world when the Big Guy loses faith in humanity. LUCAS BLACK, TYRESE GIBSON, JON TENNEY and CHARLES S. DUTTON also star.