Live-action film version of the classic kids cartoon series. Fred (Freddie Prinze Jr), Daphne (Sarah Michelle Gellar), Velma (Linda Cardellini), Shaggy (Matthew Lillard) and their dog Scooby have accepted an invitation to investigate some mysterious cases of brainwashing on Spooky Island. When they arrive, they soon discover that a sinister voodoo cult is at work upon the island; but when Fred, Daphne and Velma all get turned into zombies, it's left to Shaggy and Scooby to save the day.