Buoyed by Scooby-Doo's $54 million opening weekend, Warner Bros. is moving ahead with plans for a sequel that reunites director Raja Gosnell with cast members Sarah Michelle Gellar, Freddie Prinze Jr., Matthew Lillard and Linda Cardellini. A 2004 release is planned. In related news Lillard (aka Shaggy) and wife Heather became parents of a baby girl, Addison Grace, on June 13.