 Using recycled footage from the previous three films as well as some new footage filmed in Agua Dulce, California's Vasquez Rocks Natural Area Park, the film focuses on a small town sheriff (Eric Roberts) and an animal control officer (Melissa Brasselle) investigating a series of deaths by genetically engineered dinosaurs that escape from a nearby laboratory (mainly "Velociraptor"s), while also dealing with their creator Dr. Hyde (Corbin Bernsen).The film has since gone out of print and is largely considered to be the hardest film in the series to obtain.Released direct-to-video on September 1, 2006.