Monsters Unleashed Edit History Scooby-Doo 2: Monsters Unleashed''' Scooby-Doo 2: Monsters Unleashed Directed by Raja Gosnell Produced by Charles Roven Richard Suckle Written by Screenplay: James Gunn Characters: William Hanna Joseph Barbera Starring Matthew Lillard Freddie Prinze, Jr. Sarah Michelle Gellar Linda Cardellini Seth Green Paul Goodhand Music by David Newman Cinematography