Thora Birch as Karen Clarke / Susan Hamilton

Toby Stephens as Dr. Woodleigh

Christien Anholt as David Hamilton

Joanna Hole as Elaine Jordan

Jonny Coyne as Priest 2

Lorraine Bruce as Mary Sullivan

Ray Charleson as Mr. Kyrke-Smith

Alan Perrin as Detective Jackson

Michael J. Reynolds as Dr. Richardson

Glenn Beck as Mr. Saunders

Ian Porter as News Anchor

Sarah Whitefoot as Jennifer Landau

Sheryl Gannaway as Judith Palmer