'Dune' and 'Mission Impossible's' Rebecca Ferguson is the latest actor to join the star-studded film adaptation of 'The Magic Faraway Tree.' Ferguson has joined the cast in the role of Dame Snap, the story's headmistress and one of Blyton's most iconic villains. Ferguson will line up alongside Andrew Garfield, Claire Foy, Nicola Coughlan, Jessica Gunning and Jennifer Saunders of Enid Blyton's beloved children's classic.