sentences:  Sybil spends her time plotting thefts, and also trying to defeat the Spooks in the later episodes.The Spooks, however, always managed to outwit her, no matter how clever her plans were.Cedric Montague Sludge - Played by John Thirtle and Richard Coombs - The brother of Sybil and Sid, Cedric tended to help his sister with her schemes, rather than coming up with his own.