“Scooby Doo where are you?”

This time Scooby Doo is headed to TV and DVD with a third live-action/CG Scooby-Doo movie.

Scooby-Doo: In the Beginning — a prequel set before the 2002 and 2004 Scooby-Doo theatricals – on Cartoon Network in the fall 2009 is the big date while it also will be released on DVD. The Mystery gang unites for the first time to solve the haunting of their high school.

Scooby-Doo: In the Beginning features an all new cast of lesser-known actors replacing the original quartet of Freddie Prinze Jr., Sarah Michelle Gellar, Matthew Lillard and Linda Cardellini. Rob Amell (“Life With Derek”) will play Freddy, joined by newcomers Kaitlyn Melton as Daphne, Hayley Alcroft as Velma and Nick Palatas as Shaggy. The computer-generated Scooby-Doo will be voiced by Frank Welker, a longtime voice actor on the animated Scooby-Doo series.

Production is scheduled to start Monday in Vancouver.