UPDATE: Stewart revealed on Twitter that Christopher Plummer and Brad Dourif have also joined the cast! Madchen Amick (“Californication”) has joined the cast of the post-apocalyptic thriller Priest. Scripted by Cory Goodman, the thriller involves a warrior priest, played by Paul Bettany, who turns against the church to track down a murderous band of vampires who kidnapped his niece. Amick will play Shannon, the mother of the kidnapped niece. She stars alongside “True Blood” fav Stephen Moyer, Cam Gigandet (The Unborn, Twilight, The Roommate, Pandorum) and Maggie Q.